1
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Zheng J, Feng H, Zhang X, Zheng J, Ng JKW, Wang S, Hadjichristidis N, Li Z. Advancing Recyclable Thermosets through C═C/C═N Dynamic Covalent Metathesis Chemistry. J Am Chem Soc 2024; 146:21612-21622. [PMID: 39046371 DOI: 10.1021/jacs.4c05346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2024]
Abstract
Thermoset polymers have become integral to our daily lives due to their exceptional durability, making them feasible for a myriad of applications; however, this ubiquity also raises serious environmental concerns. Covalent adaptable networks (CANs) with dynamic covalent linkages that impart efficient reprocessability and recyclability to thermosets have garnered increasing attention. While various dynamic exchange reactions have been explored in CANs, many rely on the stimuli of active nucleophilic groups and/or catalysts, introducing performance instability and escalating the initial investment. Herein, we propose a new direct and catalyst-free C═C/C═N metathesis reaction between α-cyanocinnamate and aldimine as a novel dynamic covalent motif for constructing recyclable thermosets. This chemistry offers mild reaction conditions (room temperature and catalyst-free), ensuring high yields and simple isolation procedures. By incorporating dynamic C═C/C═N linkages into covalently cross-linked polymer networks, we obtained dynamic thermosets that exhibit both malleability and reconfigurability. The resulting tunable dynamic properties, coupled with the high thermal stability and recyclability of the C═C/C═N linkage-based networks, enrich the toolbox of dynamic covalent chemistry.
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Affiliation(s)
- Jie Zheng
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore
| | - Hongzhi Feng
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore
- Key Laboratory of Bio-Based Polymeric Materials Technology and Application of Zhejiang Province, Laboratory of Polymers and Composites, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People's Republic of China
| | - Xinglong Zhang
- Institute of High Performance Computing (IHPC), Agency for Science, Technology, and Research (A*STAR), Singapore 138632, Republic of Singapore
| | - Jianwei Zheng
- Institute of High Performance Computing (IHPC), Agency for Science, Technology, and Research (A*STAR), Singapore 138632, Republic of Singapore
| | - Jeffrey Kang Wai Ng
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore
| | - Sheng Wang
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore
| | - Nikos Hadjichristidis
- Polymer Synthesis Laboratory, Chemistry Program, Physical Sciences and Engineering Division, KAUST Catalysis Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
| | - Zibiao Li
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore
- Institute of Materials Research and Engineering, Agency for Science, Technology, and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Republic of Singapore
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2
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Kumar V, Kuang W, Fifield LS. Carbon Fiber-Based Vitrimer Composites: A Path toward Current Research That Is High-Performing, Useful, and Sustainable. MATERIALS (BASEL, SWITZERLAND) 2024; 17:3265. [PMID: 38998348 PMCID: PMC11243385 DOI: 10.3390/ma17133265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Revised: 06/19/2024] [Accepted: 06/24/2024] [Indexed: 07/14/2024]
Abstract
In the polymeric material industry, thermosets and related composites have played a substantial role in the production of rubber and plastics. One important subset of these is thermoset composites with carbon reinforcement. The incorporation of carbon fillers and fibers gives polymeric materials improved electrical and mechanical properties, among other benefits. However, the covalently crosslinked network of thermosets presents significant challenges for recycling and reprocessing because of its intractable nature. The introduction of vitrimer materials opens a new avenue to produce biodegradable and recyclable thermosets. Carbon-reinforced vitrimer composites are pursued for high-performance, long-lasting materials with attractive physical properties, the ability to be recycled and processed, and other features that respond uniquely to stimuli. The development of carbon-reinforced vitrimer composites over the last few years is summarized in this article. First, an overview of vitrimers and the methods used to prepare carbon fiber-reinforced vitrimer composites is provided. Because of the vitrimer nature of such composites, reprocessing, healing, and recycling are viable ways to greatly extend their service life; these approaches are thoroughly explained and summarized. The conclusion is our prediction for developing carbon-based vitrimer composites.
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Affiliation(s)
| | | | - Leonard S. Fifield
- Pacific Northwest National Laboratory, Richland, WA 99354, USA; (V.K.); (W.K.)
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3
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Lei Z, Chen H, Huang S, Wayment LJ, Xu Q, Zhang W. New Advances in Covalent Network Polymers via Dynamic Covalent Chemistry. Chem Rev 2024; 124:7829-7906. [PMID: 38829268 DOI: 10.1021/acs.chemrev.3c00926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2024]
Abstract
Covalent network polymers, as materials composed of atoms interconnected by covalent bonds in a continuous network, are known for their thermal and chemical stability. Over the past two decades, these materials have undergone significant transformations, gaining properties such as malleability, environmental responsiveness, recyclability, crystallinity, and customizable porosity, enabled by the development and integration of dynamic covalent chemistry (DCvC). In this review, we explore the innovative realm of covalent network polymers by focusing on the recent advances achieved through the application of DCvC. We start by examining the history and fundamental principles of DCvC, detailing its inception and core concepts and noting its key role in reversible covalent bond formation. Then the reprocessability of covalent network polymers enabled by DCvC is thoroughly discussed, starting from the significant milestones that marked the evolution of these polymers and progressing to their current trends and applications. The influence of DCvC on the crystallinity of covalent network polymers is then reviewed, covering their bond diversity, synthesis techniques, and functionalities. In the concluding section, we address the current challenges faced in the field of covalent network polymers and speculates on potential future directions.
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Affiliation(s)
- Zepeng Lei
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Hongxuan Chen
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Shaofeng Huang
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Lacey J Wayment
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Qiucheng Xu
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Wei Zhang
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
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4
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Wang YH, Hung DY, Liu YL. Is a Vitrimer with a High Glass Transition Temperature Available? A Case Study on Rigid Polyimides Cross-Linked with Dynamic Ester Bonds. Macromol Rapid Commun 2024:e2400312. [PMID: 38860731 DOI: 10.1002/marc.202400312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2024] [Revised: 06/05/2024] [Indexed: 06/12/2024]
Abstract
Vitrimers, possessing associative covalent adaptable networks, are cross-linked polymers exhibiting malleable (glass-like) feature and recyclable and reprocessable (thermoplastics-like) properties. The dynamic behaviors of vitrimer are dependent on both chain/molecular mobility (glass transition temperature, Tg) and dynamic bond-exchanging reaction rate (topology freezing transition temperature, Tv). This work aims on probing the effect of high Tg on the stress relaxation and physical recyclability of vitrimers, employing a polyimide cross-linked with dynamic ester bonds (Tg: 310 °C) as the example. Due to its high Tg and chain rigidity, the cross-linked polyimide does not exhibit a high extent of stress relaxation behavior at 320 °C (10 °C above its Tg), even though the temperature is much higher than the hypothetical Tv. While raising the processing temperature to 345 °C, the cross-linked polyimide exhibits a stress relaxation time of about 3300 s and physical malleability. Nevertheless, side reactions may occur in the recycling and reprocessing process under the harsh condition (high temperature and high pressure) to alter the thermal properties of the recycled sample. The diffusion control plays a critical role on the topography transition of a vitrimer having a high Tg. The Tg ceiling is noticeable for developments of vitrimers.
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Affiliation(s)
- Yueh-Hsin Wang
- Department of Chemical Engineering, National Tsing Hua University, No. 101, Sec. 2, Kuang-Fu Road, Hsinchu, 300044, Taiwan
| | - Du-Yuan Hung
- Department of Chemical Engineering, National Tsing Hua University, No. 101, Sec. 2, Kuang-Fu Road, Hsinchu, 300044, Taiwan
| | - Ying-Ling Liu
- Department of Chemical Engineering, National Tsing Hua University, No. 101, Sec. 2, Kuang-Fu Road, Hsinchu, 300044, Taiwan
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5
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Pruksawan S, Chong YT, Zen W, Loh TJE, Wang F. Sustainable Vat Photopolymerization-Based 3D-Printing through Dynamic Covalent Network Photopolymers. Chem Asian J 2024; 19:e202400183. [PMID: 38509002 DOI: 10.1002/asia.202400183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 03/19/2024] [Accepted: 03/20/2024] [Indexed: 03/22/2024]
Abstract
Vat photopolymerization (VPP) based three-dimensional (3D) printing, including stereolithography (SLA) and digital light projection (DLP), is known for producing intricate, high-precision prototypes with superior mechanical properties. However, the challenge lies in the non-recyclability of covalently crosslinked thermosets used in these printing processes, limiting the sustainable utilization of printed prototypes. This review paper examines the recently explored avenue of VPP 3D-printed dynamic covalent network (DCN) polymers, which enable reversible crosslinks and allow for the reprocessing of printed prototypes, promoting sustainability. These reversible crosslinks facilitate the rearrangement of crosslinked polymers, providing printed polymers with chemical/physical recyclability, self-healing capabilities, and degradability. While various mechanisms for DCN polymer systems are explored, this paper focuses solely on photocurable polymers to highlight their potential to revolutionize the sustainability of VPP 3D printing.
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Affiliation(s)
- Sirawit Pruksawan
- Institute of Materials Research and Engineering (IMRE), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Republic of Singapore
| | - Yi Ting Chong
- Institute of Materials Research and Engineering (IMRE), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Republic of Singapore
| | - Wylma Zen
- Institute of Materials Research and Engineering (IMRE), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Republic of Singapore
- College of Design and Engineering, National University of Singapore (NUS), 4 Engineering Drive 3, Singapore, 117583, Republic of Singapore
| | - Terence Jun En Loh
- Institute of Materials Research and Engineering (IMRE), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Republic of Singapore
- Nanyang Polytechnic, 180 Ang Mo Kio Avenue 8, Singapore, 569830, Republic of Singapore
| | - FuKe Wang
- Institute of Materials Research and Engineering (IMRE), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634, Republic of Singapore
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6
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Adjaoud A, Marcolini B, Dieden R, Puchot L, Verge P. Deciphering the Self-Catalytic Mechanisms of Polymerization and Transesterification in Polybenzoxazine Vitrimers. J Am Chem Soc 2024; 146:13367-13376. [PMID: 38696347 PMCID: PMC11100009 DOI: 10.1021/jacs.4c02153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Revised: 04/15/2024] [Accepted: 04/17/2024] [Indexed: 05/04/2024]
Abstract
The use of internal catalysts has emerged as a pivotal design principle to facilitate dynamic exchanges within covalent adaptable networks (CANs). Polybenzoxazines, specifically, have shown considerable potential in generating vitrimers through thermally induced transesterification reactions catalyzed internally by tertiary amines. This study aims to investigate the chemical complexities of transesterification reactions within benzoxazine vitrimers. To achieve this, model molecules using various phenolic acids and amino-alcohol derivatives were synthesized as precursors. The structure of these model molecules was fully elucidated by using nuclear magnetic resonance (NMR). Differential scanning calorimetry (DSC) and rheology experiments evidenced the accelerated network formation of the precursors due to the presence of aliphatic -OH groups. Thermogravimetric analysis coupled with microcomputed gas chromatography (TGA-μGC) was used to provide evidence of transesterification reactions. The results showed that the spatial proximity between tertiary amine and hydroxyl groups significantly enhances the rate exchange, attributed to a neighboring group participation (NGP) effect. Interestingly, kinetic experiments using complementary NMR techniques revealed the thermal latency of the tertiary amine of benzoxazine toward transesterification reactions as its opening is needed to trigger the dynamic exchange. The study highlights the crucial role of steric hindrance and tertiary amine basicity in promoting the dynamic exchange in an internally catalyzed system.
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Affiliation(s)
- Antoine Adjaoud
- Luxembourg
Institute of Science and Technology, 5 Avenue des Hauts-Fourneaux, Esch-sur-Alzette L-4362, Luxembourg
- University
of Luxembourg, 2 Avenue
de Université, Esch-sur-Alzette L-4365, Luxembourg
| | - Benoit Marcolini
- Luxembourg
Institute of Science and Technology, 5 Avenue des Hauts-Fourneaux, Esch-sur-Alzette L-4362, Luxembourg
| | - Reiner Dieden
- Luxembourg
Institute of Science and Technology, 5 Avenue des Hauts-Fourneaux, Esch-sur-Alzette L-4362, Luxembourg
| | - Laura Puchot
- Luxembourg
Institute of Science and Technology, 5 Avenue des Hauts-Fourneaux, Esch-sur-Alzette L-4362, Luxembourg
| | - Pierre Verge
- Luxembourg
Institute of Science and Technology, 5 Avenue des Hauts-Fourneaux, Esch-sur-Alzette L-4362, Luxembourg
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7
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Tran HTT, Nisha SS, Radjef R, Nikzad M, Bjekovic R, Fox B. Recyclable and Biobased Vitrimers for Carbon Fibre-Reinforced Composites-A Review. Polymers (Basel) 2024; 16:1025. [PMID: 38674946 PMCID: PMC11054932 DOI: 10.3390/polym16081025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 03/26/2024] [Accepted: 03/27/2024] [Indexed: 04/28/2024] Open
Abstract
Economic and environmental concerns over the accumulation of end-of-life carbon fibre composite waste have led to increased attention to sustainable materials with low environmental impact. Over decades of research, vitrimers, a modern class of covalent adaptable networks, have bridged the gap between thermoplastics and thermosets. With the distinguishing feature of dynamic covalent bonds, vitrimers can be rearranged and reprocessed within their existing network structures in response to external stimuli such as heat or light. This poses a unique solution to repairing damaged composites, extending their service life, and reducing post-consumer waste. However, the synthesis of vitrimers often requires petrochemical consumption, which increases their carbon footprint. Using bio-based materials could be a promising solution to reduce the reliance on petrochemicals and their related pollution. This review compiles the contemporary requirements for bio-based vitrimers regarding their properties, scalability, and recycling features. This article also presents a comprehensive overview of the pathways to produce sustainable bio-based vitrimers and an overview of promising studies showing the potential uses of bio-derived vitrimers on carbon fibre composite productions.
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Affiliation(s)
- Hoang T. T. Tran
- Department of Mechanical Engineering and Product Design Engineering, Swinburne University of Technology, Melbourne, Victoria 3122, Australia; (S.S.N.); (R.R.); (M.N.)
| | - Shammi Sultana Nisha
- Department of Mechanical Engineering and Product Design Engineering, Swinburne University of Technology, Melbourne, Victoria 3122, Australia; (S.S.N.); (R.R.); (M.N.)
| | - Racim Radjef
- Department of Mechanical Engineering and Product Design Engineering, Swinburne University of Technology, Melbourne, Victoria 3122, Australia; (S.S.N.); (R.R.); (M.N.)
| | - Mostafa Nikzad
- Department of Mechanical Engineering and Product Design Engineering, Swinburne University of Technology, Melbourne, Victoria 3122, Australia; (S.S.N.); (R.R.); (M.N.)
| | - Robert Bjekovic
- Faculty of Mechanical Engineering, University of Applied Sciences Ravensburg-Weingarten, 88250 Weingarten, Germany;
| | - Bronwyn Fox
- Department of Mechanical Engineering and Product Design Engineering, Swinburne University of Technology, Melbourne, Victoria 3122, Australia; (S.S.N.); (R.R.); (M.N.)
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8
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Fanjul-Mosteirín N, Odelius K. Covalent Adaptable Networks with Tailorable Material Properties Based on Divanillin Polyimines. Biomacromolecules 2024; 25:2348-2357. [PMID: 38499398 PMCID: PMC11005045 DOI: 10.1021/acs.biomac.3c01224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 03/05/2024] [Accepted: 03/05/2024] [Indexed: 03/20/2024]
Abstract
Covalent adaptable networks (CANs) are being developed as future replacements for thermosets as they can retain the high mechanical and chemical robustness inherent to thermosets but also integrate the possibility of reprocessing after material use. Here, covalent adaptable polyimine-based networks were designed with methoxy and allyloxy-substituted divanillin as a core component together with long flexible aliphatic fatty acid-based amines and a short rigid chain triamine, yielding CANs with a high renewable content. The designed series of CANs with reversible imine functionality allowed for fast stress relaxation and tailorability of the thermomechanical properties, as a result of the ratio between long flexible and short rigid amines, with tensile strength (σb) ranging 1.07-18.7 MPa and glass transition temperatures ranging 16-61 °C. The CANs were subsequently successfully reprocessed up to three times without determinantal structure alterations and retained mechanical performance. The CANs were also successfully chemically recycled under acidic conditions, where the starting divanillin monomer was recovered and utilized for the synthesis of a recycled CAN with similar thermal and mechanical properties. This promising class of thermosets bearing sustainable dynamic functionalities opens a window of opportunity for the progressive replacement of fossil-based thermosets.
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Affiliation(s)
- Noé Fanjul-Mosteirín
- Wallenberg Wood Science Center,
WWSC, Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
| | - Karin Odelius
- Wallenberg Wood Science Center,
WWSC, Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
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9
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Sarrafan S, Li G. On Lightweight Shape Memory Vitrimer Composites. ACS APPLIED POLYMER MATERIALS 2024; 6:154-169. [PMID: 38230367 PMCID: PMC10788861 DOI: 10.1021/acsapm.3c01749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 11/10/2023] [Accepted: 11/13/2023] [Indexed: 01/18/2024]
Abstract
Lightweight materials are highly desired in many engineering applications. A popular approach to obtain lightweight polymers is to prepare polymeric syntactic foams by dispersing hollow particles, such as hollow glass microbubbles (HGMs), in a polymer matrix. Integrating shape memory vitrimers (SMVs) in fabricating these syntactic foams enhances their appeal due to the multifunctionality of SMVs. The SMV-based syntactic foams have many potential applications, including actuators, insulators, and sandwich cores. However, there is a knowledge gap in understanding the effect of the HGM volume fraction on different material properties and behaviors. In this study, we prepared an SMV-based syntactic foam to investigate the influence of the HGM volume fractions on a broad set of properties. Four sample groups, containing 40, 50, 60, and 70% HGMs by volume, were tested and compared to a control pure SMV group. A series of analyses and various chemical, physical, mechanical, thermal, rheological, and functional experiments were conducted to explore the feasibility of ultralight foams. Notably, the effect of HGM volume fractions on the rheological properties was methodically evaluated. The self-healing capability of the syntactic foam was also assessed for healing at low and high temperatures. This study proves the viability of manufacturing multifunctional ultralightweight SMV-based syntactic foams, which are instrumental for designing ultralightweight engineering structures and devices.
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Affiliation(s)
- Siavash Sarrafan
- Department of Mechanical & Industrial
Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Guoqiang Li
- Department of Mechanical & Industrial
Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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10
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Rodrigues JGP, Arias S, Pacheco JGA, Dias ML. Structure and thermal behavior of biobased vitrimer of lactic acid and epoxidized canola oil. RSC Adv 2023; 13:33613-33624. [PMID: 38019990 PMCID: PMC10652253 DOI: 10.1039/d3ra06272d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 11/05/2023] [Indexed: 12/01/2023] Open
Abstract
Biobased vitrimers were obtained from epoxidized canola oil (ECO) and lactic acid (LA) using zinc acetate (ZnAc) and ZnAl-layered double hydroxide (ZnAl) in the proportions of 1 and 2 wt% as transesterification catalysts. Reactions containing ECO and LA showed an average enthalpy of cure of approximately 85 mJ mg-1 and materials cured in the presence of the catalysts showed lower enthalpies of cure and decrease in the material gel content. ECO-LA reaction generated materials with rubber-like properties with Tg ranging from -15 °C to -23 °C, where the material without a catalyst showed the higher Tg value. The presence of catalysts gave the material vitrimer properties, with the softening point associated with transesterification reactions and topology freezing temperature transition at temperatures (Tv) between 195-235 °C.
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Affiliation(s)
- João Gabriel P Rodrigues
- Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro Brazil
| | - Santiago Arias
- Chemistry Institute, Federal University of Pernambuco Brazil
| | | | - Marcos Lopes Dias
- Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro Brazil
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11
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Alabiso W, Sölle B, Reisinger D, Guedes de la Cruz G, Schmallegger M, Griesser T, Rossegger E, Schlögl S. On-Demand Activation of Transesterification by Chemical Amplification in Dynamic Thiol-Ene Photopolymers. Angew Chem Int Ed Engl 2023; 62:e202311341. [PMID: 37677110 DOI: 10.1002/anie.202311341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 09/02/2023] [Accepted: 09/05/2023] [Indexed: 09/09/2023]
Abstract
Chemical amplification is a well-established concept in photoresist technology, wherein one photochemical event leads to a cascade of follow-up reactions that facilitate a controlled change in the solubility of a polymer. Herein, we transfer this concept to dynamic polymer networks to liberate both catalyst and functional groups required for bond exchange reactions under UV irradiation. For this, we exploit a photochemically generated acid to catalyse a deprotection reaction of an acid-labile tert-butoxycarbonyl group, which is employed to mask the hydroxy groups of a vinyl monomer. At the same time, the released acid serves as a catalyst for thermo-activated transesterifications between the deprotected hydroxy and ester moieties. Introduced in an orthogonally cured (450 nm) thiol-click photopolymer, this approach allows for a spatio-temporally controlled activation of bond exchange reactions, which is crucial in light of the creep resistance versus reflow ability trade-off of dynamic polymer networks.
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Affiliation(s)
- Walter Alabiso
- Polymer Competence Center Leoben GmbH, Sauraugasse 1, A-8700, Leoben, Austria
| | - Bernhard Sölle
- Polymer Competence Center Leoben GmbH, Sauraugasse 1, A-8700, Leoben, Austria
| | - David Reisinger
- Polymer Competence Center Leoben GmbH, Sauraugasse 1, A-8700, Leoben, Austria
| | - Gema Guedes de la Cruz
- Chair of Chemistry of Polymeric Materials, Montanuniversitaet Leoben, Otto-Glöckel-Straße 2, A-8700, Leoben, Austria
| | - Max Schmallegger
- Institute of Physical and Theoretical Chemistry, Stremayrgasse 9/I (A), A-8010, Graz, Austria
| | - Thomas Griesser
- Chair of Chemistry of Polymeric Materials, Montanuniversitaet Leoben, Otto-Glöckel-Straße 2, A-8700, Leoben, Austria
| | - Elisabeth Rossegger
- Polymer Competence Center Leoben GmbH, Sauraugasse 1, A-8700, Leoben, Austria
| | - Sandra Schlögl
- Polymer Competence Center Leoben GmbH, Sauraugasse 1, A-8700, Leoben, Austria
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12
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Gu S, Xiao YF, Tan SH, Liu BW, Guo DM, Wang YZ, Chen L. Neighboring Molecular Engineering in Diels-Alder Chemistry Enabling Easily Recyclable Carbon Fiber Reinforced Composites. Angew Chem Int Ed Engl 2023:e202312638. [PMID: 37759361 DOI: 10.1002/anie.202312638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 09/27/2023] [Accepted: 09/27/2023] [Indexed: 09/29/2023]
Abstract
Although a variety of dynamic covalent bonds have been successfully used in the development of diverse sustainable thermosetting polymers and their composites, solving the trade-off between recovery efficiency and comprehensive properties is still a major challenge. Herein, a "one-stone-two-birds" strategy of lower rotational energy barrier (Er ) phosphate-derived Diels-Alder (DA) cycloadditions was proposed for easily recyclable carbon fiber (CF)-reinforced epoxy resins (EPs) composites. In such a strategy, the phosphate spacer with lower Er accelerated the segmental mobility and dynamic DA exchange reaction for network rearrangement to achieve high-efficiency repairing, reprocessing of the EPs matrix and its composites and rapid nondestructive recycling of CF; meanwhile, incorporating phosphorus-based units especially reduced their fire hazards. The resulting materials simultaneously showed excellent thermal/mechanical properties, superb fire safety and facile recyclability, realizing the concept of recycling for high-performance thermosetting polymers and composites. This strategy is of great significance for understanding and enriching the molecular connotation of DA chemistry, making it potentially applicable to the design and development of a wide range of dynamic covalent adaptable materials toward practical cutting-edge-tech applications.
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Affiliation(s)
- Song Gu
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Yan-Fang Xiao
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Shi-Huan Tan
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Bo-Wen Liu
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - De-Ming Guo
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Yu-Zhong Wang
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Li Chen
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China
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13
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Yang S, Liu W, Guo J, Yang Z, Qiao Z, Zhang C, Li J, Xu J, Zhao N. Direct and Catalyst-Free Ester Metathesis Reaction for Covalent Adaptable Networks. J Am Chem Soc 2023; 145:20927-20935. [PMID: 37710975 DOI: 10.1021/jacs.3c06262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/16/2023]
Abstract
Thermosetting polymers possess excellent environmental resistance and mechanical properties but cannot be reprocessed due to their covalently cross-linked structures. Recycling of thermosets via the implantation of dynamic covalent bonds offers a promising solution. Here, we report the direct and catalyst-free ester metathesis of N-acyloxyphthalimide (NAPI) at about 100 °C without the requirement of hydroxyl groups and its utilization for the fabrication of covalent adaptable networks (CANs). NAPI metathesis has interesting sigmoid kinetics with a fast exchange rate, which proceeds via a free radical chain mechanism, guaranteeing a fast associative exchange under a rather low dissociation. The bifunctional molecule of NAPI as both the radical precursor and substrate is the key to the dissociatively initiated associative (DAssociative) mechanism and kinetic behavior. Based on the efficient NAPI metathesis, polyester networks, poly(N-acyloxyphthalimides) (PNAPIs), show excellent malleability. Notably, PNAPIs exhibit exceptional solvent resistance and mechanical stability at elevated temperatures owing to the unique DAssociative mechanism, suggesting exciting opportunities for designing recyclable thermosetting polymers.
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Affiliation(s)
- Shijia Yang
- Beijing National Laboratory for Molecular Sciences (BNLMS), Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wenxing Liu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Jing Guo
- Beijing National Laboratory for Molecular Sciences (BNLMS), Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Zhusheng Yang
- Beijing National Laboratory for Molecular Sciences (BNLMS), Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Zhi Qiao
- Beijing National Laboratory for Molecular Sciences (BNLMS), Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Chenguang Zhang
- Beijing National Laboratory for Molecular Sciences (BNLMS), Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Jikun Li
- Key Laboratory of Photochemistry CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jian Xu
- Beijing National Laboratory for Molecular Sciences (BNLMS), Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Ning Zhao
- Beijing National Laboratory for Molecular Sciences (BNLMS), Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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14
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Sun J, Liang M, Yin L, Rivers G, Hu G, Pan Q, Zhao B. Interfacial Compatibility of Core-Shell Cellulose Nanocrystals for Improving Dynamic Covalent Adaptable Networks' Fracture Resistance in Nanohybrid Vitrimer Composites. ACS APPLIED MATERIALS & INTERFACES 2023; 15:39786-39796. [PMID: 37578445 DOI: 10.1021/acsami.3c05041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
The development of polymeric nanocomposites with dynamic covalent adaptable networks and biobased nanomaterials has been a promising approach toward sustainable advanced materials, enabling reprogramming and recycling capabilities. Herein, a core-shell nanohybrid of functionalized cellulose nanocrystals (CNCs) is explored to provide crucial interfacial compatibility for improving the covalent adaptable networks of epoxy-thiol vitrimers in fracture resistance. The poly(ε-caprolactone) (PCL) shells grafted from CNC surfaces can be cross-linked with the covalent adaptable networks via a hot-pressing transesterification process. According to the additive concentration and annealing temperature, the stress relaxation behavior of nanohybrid vitrimer composites can be effectively regulated by the core-shell PCL-grafted CNC (CNC-PCL) nanohybrids from a dispersed to cross-linked interaction. The addition of 15 wt % of the core-shell CNC-PCLs exhibits the reinforced improvement of nanohybrid vitrimer composites in the average Young's modulus of 2.5×, fracture stress of 5.4×, and fracture strain of 2.0×. The research findings might have profound implications for developing synergistic interfacial compatibility between dynamic vitrimer networks and functional nanoparticles for advanced polymeric nanocomposites.
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Affiliation(s)
- Jian Sun
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology, Centre for Bioengineering and Biotechnology, Institute for Polymer Research, University of Waterloo, Waterloo N2L 3G1, Canada
| | - Mingrui Liang
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology, Centre for Bioengineering and Biotechnology, Institute for Polymer Research, University of Waterloo, Waterloo N2L 3G1, Canada
| | - Lu Yin
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology, Centre for Bioengineering and Biotechnology, Institute for Polymer Research, University of Waterloo, Waterloo N2L 3G1, Canada
| | - Geoffrey Rivers
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology, Centre for Bioengineering and Biotechnology, Institute for Polymer Research, University of Waterloo, Waterloo N2L 3G1, Canada
- Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - Guangwei Hu
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology, Centre for Bioengineering and Biotechnology, Institute for Polymer Research, University of Waterloo, Waterloo N2L 3G1, Canada
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Qinmin Pan
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Boxin Zhao
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology, Centre for Bioengineering and Biotechnology, Institute for Polymer Research, University of Waterloo, Waterloo N2L 3G1, Canada
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15
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Reisinger D, Kriehuber MU, Bender M, Bautista-Anguís D, Rieger B, Schlögl S. Thermally Latent Bases in Dynamic Covalent Polymer Networks and their Emerging Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2300830. [PMID: 36916976 DOI: 10.1002/adma.202300830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 03/05/2023] [Indexed: 06/16/2023]
Abstract
A novel strategy allowing temporal control of dynamic bond exchange in covalently crosslinked polymer networks via latent transesterification catalysts is introduced. Obtained by a straightforward air- and water-tolerant synthesis, the latent catalyst is designed for an irreversible temperature-mediated release of a strong organic base. Its long-term inactivity at temperatures below 50 °C provides the unique opportunity to equip dynamic covalent networks with creep resistance and high bond-exchange rates, once activated. The presented thermally latent base catalyst is conveniently introducible in readily available building blocks and, as proof of concept, applied in a radically polymerized thiol-ene network. Light-mediated curing is used for 3D-printing functional objects, on which the possibility of spatially controlled reshaping and welding based on dynamic transesterification is illustrated. Since the catalyst is thermally activated, limitations regarding sample geometry and optical transparency do not apply, which facilitates a transfer to well-established industrial technologies. Consequently, fiber-reinforced and highly filled magneto-active thiol-ene polymer composites are fabricated by a thermal curing approach. The on-demand activation of dynamic transesterification is demonstrated by (magneto-assisted) reshaping experiments, highlighting a wide range of potential future applications offered by the presented concept.
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Affiliation(s)
- David Reisinger
- Polymer Competence Center Leoben GmbH, Roseggerstraße 12, Leoben, 8700, Austria
| | | | - Marcel Bender
- Processing of Composites Group, Montanuniversität Leoben, Otto Glöckel-Straße 2, Leoben, 8700, Austria
| | | | - Bernhard Rieger
- WACKER-Chair of Macromolecular Chemistry, Technical University of Munich, Lichtenbergstraße 4, 85748, Garching, Germany
| | - Sandra Schlögl
- Polymer Competence Center Leoben GmbH, Roseggerstraße 12, Leoben, 8700, Austria
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16
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Yan T, Balzer AH, Herbert KM, Epps TH, Korley LTJ. Circularity in polymers: addressing performance and sustainability challenges using dynamic covalent chemistries. Chem Sci 2023; 14:5243-5265. [PMID: 37234906 PMCID: PMC10208058 DOI: 10.1039/d3sc00551h] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 04/14/2023] [Indexed: 05/28/2023] Open
Abstract
The circularity of current and future polymeric materials is a major focus of fundamental and applied research, as undesirable end-of-life outcomes and waste accumulation are global problems that impact our society. The recycling or repurposing of thermoplastics and thermosets is an attractive solution to these issues, yet both options are encumbered by poor property retention upon reuse, along with heterogeneities in common waste streams that limit property optimization. Dynamic covalent chemistry, when applied to polymeric materials, enables the targeted design of reversible bonds that can be tailored to specific reprocessing conditions to help address conventional recycling challenges. In this review, we highlight the key features of several dynamic covalent chemistries that can promote closed-loop recyclability and we discuss recent synthetic progress towards incorporating these chemistries into new polymers and existing commodity plastics. Next, we outline how dynamic covalent bonds and polymer network structure influence thermomechanical properties related to application and recyclability, with a focus on predictive physical models that describe network rearrangement. Finally, we examine the potential economic and environmental impacts of dynamic covalent polymeric materials in closed-loop processing using elements derived from techno-economic analysis and life-cycle assessment, including minimum selling prices and greenhouse gas emissions. Throughout each section, we discuss interdisciplinary obstacles that hinder the widespread adoption of dynamic polymers and present opportunities and new directions toward the realization of circularity in polymeric materials.
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Affiliation(s)
- Tianwei Yan
- Department of Chemical & Biomolecular Engineering, University of Delaware Newark 19716 Delaware USA
- Center for Plastics Innovation (CPI), University of Delaware Newark 19716 Delaware USA
| | - Alex H Balzer
- Department of Chemical & Biomolecular Engineering, University of Delaware Newark 19716 Delaware USA
- Center for Plastics Innovation (CPI), University of Delaware Newark 19716 Delaware USA
| | - Katie M Herbert
- Center for Plastics Innovation (CPI), University of Delaware Newark 19716 Delaware USA
| | - Thomas H Epps
- Department of Chemical & Biomolecular Engineering, University of Delaware Newark 19716 Delaware USA
- Center for Plastics Innovation (CPI), University of Delaware Newark 19716 Delaware USA
- Department of Materials Science and Engineering, University of Delaware Newark 19716 Delaware USA
- Center for Research in Soft matter and Polymers (CRiSP), University of Delaware Newark 19716 Delaware USA
| | - LaShanda T J Korley
- Department of Chemical & Biomolecular Engineering, University of Delaware Newark 19716 Delaware USA
- Center for Plastics Innovation (CPI), University of Delaware Newark 19716 Delaware USA
- Department of Materials Science and Engineering, University of Delaware Newark 19716 Delaware USA
- Center for Research in Soft matter and Polymers (CRiSP), University of Delaware Newark 19716 Delaware USA
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17
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The Key to Solving Plastic Packaging Wastes: Design for Recycling and Recycling Technology. Polymers (Basel) 2023; 15:polym15061485. [PMID: 36987265 PMCID: PMC10053126 DOI: 10.3390/polym15061485] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 03/09/2023] [Accepted: 03/14/2023] [Indexed: 03/19/2023] Open
Abstract
Confronted with serious environmental problems caused by the growing mountains of plastic packaging waste, the prevention and control of plastic waste has become a major concern for most countries. In addition to the recycling of plastic wastes, design for recycling can effectively prevent plastic packaging from turning into solid waste at the source. The reasons are that the design for recycling can extend the life cycle of plastic packaging and increase the recycling values of plastic waste; moreover, recycling technologies are helpful for improving the properties of recycled plastics and expanding the application market for recycled materials. This review systematically discussed the present theory, practice, strategies, and methods of design for recycling plastic packaging and extracted valuable advanced design ideas and successful cases. Furthermore, the development status of automatic sorting methods, mechanical recycling of individual and mixed plastic waste, as well as chemical recycling of thermoplastic and thermosetting plastic waste, were comprehensively summarized. The combination of the front-end design for recycling and the back-end recycling technologies can accelerate the transformation of the plastic packaging industry from an unsustainable model to an economic cycle model and then achieve the unity of economic, ecological, and social benefits.
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18
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Li C, Ju B, Zhang S. Fully bio-based hydroxy ester vitrimer synthesized by crosslinking epoxidized soybean oil with doubly esterified starch. Carbohydr Polym 2023; 302:120442. [PMID: 36604037 DOI: 10.1016/j.carbpol.2022.120442] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 11/25/2022] [Accepted: 12/04/2022] [Indexed: 12/13/2022]
Abstract
Catalyst-free fully bio-based hydroxyester (BHE) vitrimers were synthesized by crosslinking and plasticizing epoxidized soybean oil with synthesized acetylated starch succinate monoesters to investigate the effects of different starch structures on the properties of the BHE vitrimers. The BHE vitrimers possessed a lower glass transition temperature as well as better solvent resistance and reprocessing performance compared to traditional starch-based materials. Owing to dynamically covalent bonds, the migration and exudation of plasticizers were avoided. A maximum strain of 230 % was achieved to prevent the retrogradation and brittleness of starch-based materials. Furthermore, the mechanical properties remained unchanged after three reprocessing cycles. Consequently, the obtained BHE vitrimers are eco-friendly and sustainable.
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Affiliation(s)
- Chang Li
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China.
| | - Benzhi Ju
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China.
| | - Shufen Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China.
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19
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High-performance and fully recyclable epoxy resins cured by imine-containing hardeners derived from vanillin and syringaldehyde. Eur Polym J 2023. [DOI: 10.1016/j.eurpolymj.2023.111878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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20
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Kumar A, Connal LA. Biobased Transesterification Vitrimers. Macromol Rapid Commun 2023; 44:e2200892. [PMID: 36661130 DOI: 10.1002/marc.202200892] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/19/2022] [Indexed: 01/21/2023]
Abstract
The rapid increase in the use of plastics and the related sustainability issues, including the depletion of global petroleum reserves, have rightly sparked interest in the use of biobased polymer feedstocks. Thermosets cannot be remolded, processed, or recycled, and hence cannot be reused because of their permanent molecular architecture. Vitrimers have emerged as a novel polymer family capable of bridging the difference between thermoplastic and thermosets. Vitrimers enable unique recycling strategies, however, it is still important to understand where the raw material feedstocks originate from. Transesterification vitrimers derived from renewable resources are a massive opportunity, however, limited research has been conducted in this specific family of vitrimers. This review article provides a comprehensive overview of transesterification vitrimers produced from biobased monomers. The focus is on the biomass structural suitability with dynamic covalent chemistry, as well as the viability of the synthetic methods.
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Affiliation(s)
- Ashwani Kumar
- Research School of Chemistry, Australian National University, Canberra, ACT, 2600, Australia
| | - Luke A Connal
- Research School of Chemistry, Australian National University, Canberra, ACT, 2600, Australia
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21
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Manarin E, Da Via F, Rigatelli B, Turri S, Griffini G. Bio-Based Vitrimers from 2,5-Furandicarboxylic Acid as Repairable, Reusable, and Recyclable Epoxy Systems. ACS APPLIED POLYMER MATERIALS 2023; 5:828-838. [PMID: 36660254 PMCID: PMC9841517 DOI: 10.1021/acsapm.2c01774] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Accepted: 12/13/2022] [Indexed: 06/17/2023]
Abstract
In this work, a series of bio-based epoxy vitrimers were developed by reacting diglycidyl ether of bisphenol A (DGEBA) and bio-based 2,5-furandicarboxylic acid (FDCA) at different molar ratios. Triazabicyclodecene was used as a transesterification catalyst to promote thermally induced exchange reactions. Differential scanning calorimetry, gel content measurements, and Fourier transform infrared spectroscopy were used to study the FDCA-DGEBA crosslinking reaction. The transesterification exchange reaction kinetics of such crosslinked systems was characterized via stress relaxation tests, evidencing an Arrhenius-type dependence of the relaxation time on temperature, and an activation energy of the dynamic rearrangement depending on the molar composition. In addition, self-healing, thermoformability, and mechanical recycling were demonstrated for the composition showing the faster topology rearrangement, namely, the FDCA/DGEBA molar ratio equal to 0.6. This work provides the first example of bio-based epoxy vitrimers incorporating FDCA, making these systems of primary importance in the field of reversible, high-performance epoxy materials for future circular economy scenarios.
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22
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More A, Elder T, Pajer N, Argyropoulos DS, Jiang Z. Novel and Integrated Process for the Valorization of Kraft Lignin to Produce Lignin-Containing Vitrimers. ACS OMEGA 2023; 8:1097-1108. [PMID: 36643463 PMCID: PMC9835646 DOI: 10.1021/acsomega.2c06445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 12/14/2022] [Indexed: 06/17/2023]
Abstract
The valorization of lignin into value-added products by oxidative conversion is a widely studied strategy. However, in many cases, this approach has limited scope for integration into industrial processes. The objective of our work is to maximize overall lignin utilization to produce diverse value-added products with a focus on integration in the existing industrial pulp and paper processes. The utilization of the sequential oxidation strategy using oxygen and ozone resulted in kraft lignin with a marked improvement in carboxyl content and also allowed the formation of vanillin and vanillic acid in the oxygen stage. The sequentially oxidized lignin (OxL-COOH) was then cured with poly(ethylene glycol) diglycidyl ether (PEG-epoxy) to form high-lignin-content (>48 wt %) vitrimers with high thermal stability, fast relaxation, swelling, and self-healing due to the presence of bond-exchangeable cross-linked networks. Overall, this study provides a novel approach for the multidimensional valorization of lignin and demonstrates an integrated approach for kraft lignin valorization in the pulp and paper industry.
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Affiliation(s)
- Ajinkya More
- Alabama
Center for Paper and Bioresource Engineering (AC-PABE), Department
of Chemical Engineering, Auburn University, Auburn, Alabama36849, United States
| | - Thomas Elder
- United
States Department of Agriculture, U.S. Forest
Service, Southern Research
Station, Auburn, Alabama36849, United States
| | - Nicolò Pajer
- Department
of Molecular Sciences and Nanosystems, Ca’
Foscari University of Venice, Via Torino 155, Venezia, Mestre30172, Italy
| | - Dimitris S. Argyropoulos
- Department
of Forest Biomaterials, NC State University, Campus Box 8005, Raleigh, North Carolina27695-8005, United States
| | - Zhihua Jiang
- Alabama
Center for Paper and Bioresource Engineering (AC-PABE), Department
of Chemical Engineering, Auburn University, Auburn, Alabama36849, United States
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23
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Jeon D, Yoon Y, Kim D, Lee G, Ahn SK, Choi D, Kim CB. Fully Recyclable Covalent Adaptable Network Composite with Segregated Hexagonal Boron Nitride Structure for Efficient Heat Dissipation. Macromolecules 2023. [DOI: 10.1021/acs.macromol.2c01927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Dupyo Jeon
- School of Chemical Engineering, Pusan National University, Busan46241, Republic of Korea
| | - Yeomyung Yoon
- School of Chemical Engineering, Pusan National University, Busan46241, Republic of Korea
| | - Doyeon Kim
- Department of Chemical Engineering, Myongji University, Yongin17058, Republic of Korea
| | - Gyuri Lee
- School of Chemical Engineering, Pusan National University, Busan46241, Republic of Korea
| | - Suk-kyun Ahn
- School of Chemical Engineering, Pusan National University, Busan46241, Republic of Korea
- Department of Polymer Science and Engineering, Pusan National University, Busan46241, Republic of Korea
| | - Dalsu Choi
- Department of Chemical Engineering, Myongji University, Yongin17058, Republic of Korea
| | - Chae Bin Kim
- School of Chemical Engineering, Pusan National University, Busan46241, Republic of Korea
- Department of Polymer Science and Engineering, Pusan National University, Busan46241, Republic of Korea
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24
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A Critical Review of Sustainable Vanillin-modified Vitrimers: Synthesis, Challenge and Prospects. REACTIONS 2023. [DOI: 10.3390/reactions4010003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Nearly 90% of thermosets are produced from petroleum resources, they have remarkable mechanical characteristics, are chemically durable, and dimensionally stable. However, they can contribute to global warming, depletion of petroleum reserves, and environmental contamination during manufacture, use, and disposal. Using renewable resources to form thermosetting materials is one of the most crucial aspects of addressing the aforementioned issues. Vanillin-based raw materials have been used in the industrial manufacturing of polymer materials because they are simple to modify structurally. Conversely, traditional thermosetting materials as a broad class of high-molecular-weight molecules are challenging to heal, decompose and recover owing to their permanent 3-D crosslinking network. Once the products are damaged, recycling issues could arise, causing resource loss and environmental impact. It could be solved by inserting dynamic covalent adaptable networks (DCANs) into the polymer chains, increasing product longevity, and minimizing waste. It also improves the attractiveness of these products in the prospective field. Moreover, it is essential to underline that increasing product lifespan and reducing waste is equivalent to reducing the expense of consuming resources. The detailed synthesis, reprocessing, thermal, and mechanical characteristics of partly and entirely biomass thermosetting polymers made from vanillin-modified monomers are covered in the current work. Finally, the review highlights the benefits, difficulties, and application of these emerging vanillin-modified vitrimers as a potential replacement for conventional non-recyclable thermosets.
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25
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van Hurne S, Kisters M, Smulders MMJ. Covalent adaptable networks using boronate linkages by incorporating TetraAzaADamantanes. Front Chem 2023; 11:1148629. [PMID: 36909710 PMCID: PMC9995436 DOI: 10.3389/fchem.2023.1148629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 02/13/2023] [Indexed: 02/25/2023] Open
Abstract
Boronic esters prepared by condensation of boronic acids and diols have been widely used as dynamic covalent bonds in the synthesis of both discrete assemblies and polymer networks. In this study we investigate the potential of a new dynamic-covalent motif, derived from TetraAzaADamantanes (TAADs), with their adamantane-like triol structure, in boronic ester-based covalent adaptable networks (CANs). The TetraAzaADamantane-boronic ester linkage has recently been reported as a more hydrolytically stable boronic ester variant, while still having a dynamic pH response: small-molecule studies found little exchange at neutral pH, while fast exchange occurred at pH 3.8. In this work, bi- and trifunctional TetraAzaADamantane linkers were synthesised and crosslinked with boronic acids to form rubber-like materials, with a Young's modulus of 1.75 MPa. The dynamic nature of the TetraAzaADamantane networks was confirmed by stress relaxation experiments, revealing Arrhenius-like behaviour, with a corresponding activation energy of 142 ± 10 kJ/mol. Increasing the crosslinking density of the material from 10% to 33% resulted in reduced relaxation times, as is consistent with a higher degree of crosslinking within the dynamic networks. In contrast to the reported accelerating effect of acid addition to small-molecule TetraAzaADamantane complexes, within the polymer network the addition of acid increased relaxation times, suggesting unanticipated interactions between the acid and the polymer that cannot occur in the corresponding small-molecules analogues. The obtained boronate-TetraAzaADamantane materials were thermally stable up to 150°C. This thermal stability, in combination with the intrinsically dynamic bonds inside the polymer network, allowed these materials to be reprocessed and healed after damage by hot-pressing.
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Affiliation(s)
- Simon van Hurne
- Laboratory of Organic Chemistry, Wageningen University, Wageningen, Netherlands
| | - Marijn Kisters
- Laboratory of Organic Chemistry, Wageningen University, Wageningen, Netherlands
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26
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Yu P, Wang H, Wang Y, Liu D, Xin Y, Li R, Jia X, Liu L, Zhang D, Wang C, Zhao J, Zhang Z, Yan X. Self-Healable, Malleable, Ecofriendly Recyclable and Robust Polyimine Thermosets Derived from Trifluoromethyl Diphenoxybenzene Backbones. Chemistry 2022; 29:e202203560. [PMID: 36510753 DOI: 10.1002/chem.202203560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 12/07/2022] [Accepted: 12/08/2022] [Indexed: 12/14/2022]
Abstract
Dynamic covalent chemistry opens up great opportunities for a sustainable society by producing reprocessable networks of polymers and even thermosets. However, achieving the closed-loop recycling of polymers with high performance remains a grand challenge. The introduction of aromatic monomers and fluorine into covalent adaptable networks is an attractive method to tackle this challenge. Therefore, we present a facile and universal strategy to focus on the design and applications of polyimine vitrimers containing trifluoromethyl diphenoxybenzene backbones in applications of dynamic covalent polymers. In this study, fluorine-containing polyimine vitrimer networks (FPIVs) were fabricated, and the results revealed that the FPIVs not only exhibited good self-healability, malleability and processability without the aid of any catalyst, but also possessed decent mechanical strength, superior toughness and thermal stability. We hope that this work could provide a novel pathway for the design of high-performance polyimine vitrimers by recycling of plastic wastes.
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Affiliation(s)
- Ping Yu
- School of Environmental and Chemical Engineering, Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, Jiangsu Ocean University, 222005, Lianyungang, P. R. China.,School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, 200240, Shanghai, P. R. China.,Jiangsu Marine Resources Development Institute, 222005, Lianyungang, P. R. China
| | - Haiyue Wang
- School of Environmental and Chemical Engineering, Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, Jiangsu Ocean University, 222005, Lianyungang, P. R. China
| | - Yi Wang
- School of Environmental and Chemical Engineering, Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, Jiangsu Ocean University, 222005, Lianyungang, P. R. China
| | - Dapeng Liu
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, 215009, Suzhou, P. R. China
| | - Yumeng Xin
- School of Environmental and Chemical Engineering, Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, Jiangsu Ocean University, 222005, Lianyungang, P. R. China
| | - Ruiguang Li
- School of Environmental and Chemical Engineering, Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, Jiangsu Ocean University, 222005, Lianyungang, P. R. China
| | - Xuemeng Jia
- School of Environmental and Chemical Engineering, Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, Jiangsu Ocean University, 222005, Lianyungang, P. R. China
| | - Lin Liu
- School of Environmental and Chemical Engineering, Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, Jiangsu Ocean University, 222005, Lianyungang, P. R. China
| | - Dongen Zhang
- School of Environmental and Chemical Engineering, Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, Jiangsu Ocean University, 222005, Lianyungang, P. R. China
| | - Chunyu Wang
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, 200240, Shanghai, P. R. China
| | - Jun Zhao
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, 200240, Shanghai, P. R. China
| | - Zhaoming Zhang
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, 200240, Shanghai, P. R. China
| | - Xuzhou Yan
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, 200240, Shanghai, P. R. China
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27
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Irzhak VI, Uflyand IE, Dzhardimalieva GI. Self-Healing of Polymers and Polymer Composites. Polymers (Basel) 2022; 14:polym14245404. [PMID: 36559772 PMCID: PMC9784839 DOI: 10.3390/polym14245404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 11/23/2022] [Accepted: 12/07/2022] [Indexed: 12/14/2022] Open
Abstract
This review is devoted to the description of methods for the self-healing of polymers, polymer composites, and coatings. The self-healing of damages that occur during the operation of the corresponding structures makes it possible to extend the service life of the latter, and in this case, the problem of saving non-renewable resources is simultaneously solved. Two strategies are considered: (a) creating reversible crosslinks in the thermoplastic and (b) introducing a healing agent into cracks. Bond exchange reactions in network polymers (a) proceed as a dissociative process, in which crosslinks are split into their constituent reactive fragments with subsequent regeneration, or as an associative process, the limiting stage of which is the interaction of the reactive end group and the crosslink. The latter process is implemented in vitrimers. Strategy (b) is associated with the use of containers (hollow glass fibers, capsules, microvessels) that burst under the action of a crack. Particular attention is paid to self-healing processes in metallopolymer systems.
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Affiliation(s)
- Vadim I. Irzhak
- Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, 142432 Chernogolovka, Russia
| | - Igor E. Uflyand
- Department of Chemistry, Southern Federal University, 344090 Rostov-on-Don, Russia
| | - Gulzhian I. Dzhardimalieva
- Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, 142432 Chernogolovka, Russia
- Moscow Aviation Institute, National Research University, 125993 Moscow, Russia
- Correspondence:
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28
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Boronic ester-based vitrimeric methylvinyl silicone elastomer with “solid-liquid” feature and rate-dependent mechanical performance. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
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29
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Fully rosin-based epoxy vitrimers with high mechanical and thermostability properties, thermo-healing and closed-loop recycling. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Preparation of degradable bio-based silicone/epoxy hybrid resins towards low dielectric composites. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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31
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Qi Y, Ramström O. Polymerization, Stimuli-induced Depolymerization, and Precipitation-driven Macrocyclization in a Nitroaldol Reaction System. Chemistry 2022; 28:e202201863. [PMID: 35971799 PMCID: PMC9826525 DOI: 10.1002/chem.202201863] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Indexed: 01/11/2023]
Abstract
Dynamic covalent polymers of different topology have been synthesized from an aromatic dialdehyde and α,ω-dinitroalkanes via the nitroaldol reaction. All dinitroalkanes yielded dynamers with the dialdehyde, where the length of the dinitroalkane chain played a vital role in determining the structure of the final products. For longer dinitroalkanes, linear dynamers were produced, where the degree of polymerization reached a plateau at higher feed concentrations. In the reactions involving 1,4-dinitrobutane and 1,5-dinitropentane, specific macrocycles were formed through depolymerization of the linear chains, further driven by precipitation. At lower temperature, the same systemic self-sorting effect was also observed for the 1,6-dinitrohexane-based dynamers. Moreover, the dynamers showed a clear adaptive behavior, displaying depolymerization and rearrangement of the dynamer chains in response to alternative building blocks as external stimuli.
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Affiliation(s)
- Yunchuan Qi
- Department of ChemistryUniversity of Massachusetts LowellOne University Ave.LowellMA 01854USA
| | - Olof Ramström
- Department of ChemistryUniversity of Massachusetts LowellOne University Ave.LowellMA 01854USA,Department of Chemistry and Biomedical SciencesLinnaeus UniversitySE-39182KalmarSweden
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32
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He C, Dong J, Xu C, Pan X. N-Coordinated Organoboron in Polymer Synthesis and Material Science. ACS POLYMERS AU 2022. [DOI: 10.1021/acspolymersau.2c00046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Congze He
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China
| | - Jin Dong
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China
| | - Chaoran Xu
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China
| | - Xiangcheng Pan
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China
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33
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Thia-Michael Reaction: The Route to Promising Covalent Adaptable Networks. Polymers (Basel) 2022; 14:polym14204457. [PMID: 36298037 PMCID: PMC9609322 DOI: 10.3390/polym14204457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 10/19/2022] [Accepted: 10/19/2022] [Indexed: 11/30/2022] Open
Abstract
While the Michael addition has been employed for more than 130 years for the synthesis of a vast diversity of compounds, the reversibility of this reaction when heteronucleophiles are involved has been generally less considered. First applied to medicinal chemistry, the reversible character of the hetero-Michael reactions has recently been explored for the synthesis of Covalent Adaptable Networks (CANs), in particular the thia-Michael reaction and more recently the aza-Michael reaction. In these cross-linked networks, exchange reactions take place between two Michael adducts by successive dissociation and association steps. In order to understand and precisely control the exchange in these CANs, it is necessary to get an insight into the critical parameters influencing the Michael addition and the dissociation rates of Michael adducts by reconsidering previous studies on these matters. This review presents the progress in the understanding of the thia-Michael reaction over the years as well as the latest developments and plausible future directions to prepare CANs based on this reaction. The potential of aza-Michael reaction for CANs application is highlighted in a specific section with comparison with thia-Michael-based CANs.
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34
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Zhao Y, Mao H, Zhang T, Guo Z, Bai D, Bai H, Zhang Q, Xiu H, Fu Q. Mechanically Robust, Heat-Resistant, and Reprocessable Polyethylene Vitrimers Cross-Linked by β-Hydroxy Ester Bonds via Reactive Processing. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c02066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Youbo Zhao
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China
| | - Hongda Mao
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China
| | - Tingting Zhang
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China
| | - Zhenyou Guo
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China
| | - Dongyu Bai
- Chongqing University Key Laboratory of Micro/Nano Materials Engineering and Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China
| | - Hongwei Bai
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China
| | - Qin Zhang
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China
| | - Hao Xiu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China
| | - Qiang Fu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China
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35
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Liu T, Shao L, Zhao B, Chang YC, Zhang J. Progress in Chemical Recycling of Carbon Fiber Reinforced Epoxy Composites. Macromol Rapid Commun 2022; 43:e2200538. [PMID: 36056702 DOI: 10.1002/marc.202200538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 08/14/2022] [Indexed: 11/06/2022]
Abstract
Carbon fiber reinforced polymer (CFRP) composites are indispensable in a variety of applications, because of their high specific strength. CFRPs are generally constructed by carbon fibers as reinforcements and crosslinked polymers as binders. Due to the irreversible nature of the crosslinked polymers, CFRPs are neither repairable nor recyclable. Once the material is damaged or out of service, landfill or incineration are the typical ways to deal with the waste. These methods are taking no advantages from the residue value of the waste and adds burdens to the environment. To extend the service life and reduce the waste and cost, it is desirable to develop effective recycling technology to reserve the residue value of carbon fiber and polymer matrix. In the past decade, chemical recycling by cleaving the covalent bonds in a solvent has been considered as an ideal path for the recycling of CFRP wastes and deserves more investigations and attentions, because it has the potential to recover both valuable CFs and polymer matrix. In this review, the discussion is focused on the recent progress on the chemical recycling of CFRP. The primary matrix resin of CFRP discussed in this review is epoxy resin which is the most widely used polymer matrix in industry. In addition, the challenges and outlook are also provided. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Tuan Liu
- School of Mechanical and Materials Engineering, Composite Materials and Engineering Center, Washington State University, Pullman, WA, 99164, USA.,School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Lin Shao
- School of Mechanical and Materials Engineering, Composite Materials and Engineering Center, Washington State University, Pullman, WA, 99164, USA
| | - Baoming Zhao
- School of Mechanical and Materials Engineering, Composite Materials and Engineering Center, Washington State University, Pullman, WA, 99164, USA
| | - Yu-Chung Chang
- School of Mechanical and Materials Engineering, Composite Materials and Engineering Center, Washington State University, Pullman, WA, 99164, USA
| | - Jinwen Zhang
- School of Mechanical and Materials Engineering, Composite Materials and Engineering Center, Washington State University, Pullman, WA, 99164, USA
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36
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Lemouzy S, Cuminet F, Berne D, Caillol S, Ladmiral V, Poli R, Leclerc E. Understanding the Reshaping of Fluorinated Polyester Vitrimers by Kinetic and DFT Studies of the Transesterification Reaction. Chemistry 2022; 28:e202201135. [DOI: 10.1002/chem.202201135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Indexed: 11/07/2022]
Affiliation(s)
| | | | - Dimitri Berne
- ICGM Univ Montpellier, CNRS, ENSCM 34293 Montpellier France
| | | | | | - Rinaldo Poli
- CNRS LCC (Laboratoire de Chimie de Coordination) UPS INPT Université de Toulouse 205 route de Narbonne 31077 Toulouse, Cedex 4 France
- Institut Universitaire de France 1, rue Descartes 75231 Paris France
| | - Eric Leclerc
- ICGM Univ Montpellier, CNRS, ENSCM 34293 Montpellier France
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37
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Hubbard AM, Ren Y, Sarvestani A, Konkolewicz D, Picu CR, Roy AK, Varshney V, Nepal D. Recyclability of Vitrimer Materials: Impact of Catalyst and Processing Conditions. ACS OMEGA 2022; 7:29125-29134. [PMID: 36033717 PMCID: PMC9404514 DOI: 10.1021/acsomega.2c02677] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Accepted: 07/25/2022] [Indexed: 06/15/2023]
Abstract
With sustainability at the forefront of material research, recyclable polymers, such as vitrimers, have garnered increasing attention since their introduction in 2011. In addition to a traditional glass-transition temperature (T g), vitrimers have a second topology freezing temperature (T v) above which dynamic covalent bonds allow for rapid stress relaxation, self-healing, and shape reprogramming. Herein, we demonstrate the self-healing, shape memory, and shape reconfigurability properties as a function of experimental conditions, aiming toward recyclability and increased useful lifetime of the material. Of interest, we report the influence of processing conditions, which makes the material vulnerable to degradation. We report a decreased crosslink density with increased thermal cycling and compressive stress. Furthermore, we demonstrate that shape reconfigurability and self-healing are enhanced with increasing compressive stress and catalyst concentration, while their performance as a shape memory material remains unchanged. Though increasing the catalyst concentration, temperature, and compressive stress clearly enhances the recovery performance of vitrimers, we must emphasize its trade-off when considering the material degradation reported here. While vitrimers hold great promise as structural materials, it is vital to understand how experimental parameters impact their properties, stability, and reprocessability before vitrimers reach their true potential.
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Affiliation(s)
- Amber M. Hubbard
- Materials
and Manufacturing Directorate, Air Force
Research Laboratory, Wright Patterson
Air Force Base, Ohio 45433, United States
- National
Research Council Research Associate, Air
Force Research Laboratory, Wright
Patterson Air Force Base, Ohio 45433, United States
| | - Yixin Ren
- Materials
and Manufacturing Directorate, Air Force
Research Laboratory, Wright Patterson
Air Force Base, Ohio 45433, United States
- ARCTOS, Beavercreek, Ohio 45432, United States
| | - Alireza Sarvestani
- Department
of Mechanical Engineering, Mercer University, Macon, Georgia 31207, United States
| | - Dominik Konkolewicz
- Department
of Chemistry and Biochemistry, Miami University, Oxford, Ohio 45056, United States
| | - Catalin R. Picu
- Department
of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Ajit K. Roy
- Materials
and Manufacturing Directorate, Air Force
Research Laboratory, Wright Patterson
Air Force Base, Ohio 45433, United States
| | - Vikas Varshney
- Materials
and Manufacturing Directorate, Air Force
Research Laboratory, Wright Patterson
Air Force Base, Ohio 45433, United States
| | - Dhriti Nepal
- Materials
and Manufacturing Directorate, Air Force
Research Laboratory, Wright Patterson
Air Force Base, Ohio 45433, United States
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38
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Grauzeliene S, Kastanauskas M, Talacka V, Ostrauskaite J. Photocurable Glycerol- and Vanillin-Based Resins for the Synthesis of Vitrimers. ACS APPLIED POLYMER MATERIALS 2022; 4:6103-6110. [PMID: 35991302 PMCID: PMC9379905 DOI: 10.1021/acsapm.2c00914] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 07/18/2022] [Indexed: 05/10/2023]
Abstract
In this study, photocurable resins based on glycerol and vanillin were designed, synthesized, and applied to digital light processing three-dimensional (3D) printing and vitrimeric abilities such as shape-memory, self-healing, and recyclability have been investigated. First, photocurable resins were prepared and synthesized by combining renewable resources and photocuring as an environmentally friendly strategy for the synthesis of vitrimers. Afterward, the most suitable resin for optical 3D printing was selected by photorheometry, and the thermal and mechanical properties of the resulting polymers were tested. Furthermore, by activating dynamic transesterification reactions at elevated temperatures, the photocured polymer exhibited self-healing, recyclability, and shape-memory properties. The vitrimer with a weight ratio of 8:2 of glycerol- and vanillin-based monomers demonstrated a welding efficiency of tensile strength up to 114.12%, 75% recyclability by alcoholysis, and shape-memory properties above and below two glass transition temperatures.
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Affiliation(s)
- Sigita Grauzeliene
- Department
of Polymer Chemistry and Technology, Kaunas
University of Technology, Radvilenu Rd. 19, Kaunas LT-50254, Lithuania
| | - Marius Kastanauskas
- Department
of Polymer Chemistry and Technology, Kaunas
University of Technology, Radvilenu Rd. 19, Kaunas LT-50254, Lithuania
| | | | - Jolita Ostrauskaite
- Department
of Polymer Chemistry and Technology, Kaunas
University of Technology, Radvilenu Rd. 19, Kaunas LT-50254, Lithuania
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39
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Marotta A, Salzano de Luna M, D'Avino A, Fornaro M, Filippone G, Ambrogi V. Mechanical properties and reprocessability of
Diels‐Alder
‐based reversible networks from furan‐modified resins. J Appl Polym Sci 2022. [DOI: 10.1002/app.52796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Angela Marotta
- Department of Chemical, Materials, and Production Engineering (INSTM Consortium−UdR Naples) University of Naples Federico II Naples Italy
| | - Martina Salzano de Luna
- Department of Chemical, Materials, and Production Engineering (INSTM Consortium−UdR Naples) University of Naples Federico II Naples Italy
| | - Amalia D'Avino
- Department of Chemical, Materials, and Production Engineering (INSTM Consortium−UdR Naples) University of Naples Federico II Naples Italy
| | - Mattia Fornaro
- Department of Chemical, Materials, and Production Engineering (INSTM Consortium−UdR Naples) University of Naples Federico II Naples Italy
| | - Giovanni Filippone
- Department of Chemical, Materials, and Production Engineering (INSTM Consortium−UdR Naples) University of Naples Federico II Naples Italy
| | - Veronica Ambrogi
- Department of Chemical, Materials, and Production Engineering (INSTM Consortium−UdR Naples) University of Naples Federico II Naples Italy
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40
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An L, Zhao W. Facile Surface Depolymerization Promotes the Welding of Hard Epoxy Vitrimer. MATERIALS 2022; 15:ma15134488. [PMID: 35806612 PMCID: PMC9267785 DOI: 10.3390/ma15134488] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 06/21/2022] [Accepted: 06/23/2022] [Indexed: 01/24/2023]
Abstract
Welding via bond exchange reactions has provided advances in obtaining high-quality joining performance. However, the reported welding method requires a relatively high press force, and challenges are still encountered in welding hard vitrimer. In this work, a facile surface depolymerization strategy was introduced to weld high-performance epoxy vitrimer. The vitrimers were firstly dissolved into ethylene glycol for depolymerization based on the solvent-assisted bond exchange reactions. Then, the depolymerized vitrimers were welded under heat and press force. The effect of the depolymerizing time, welding pressure, welding temperature and welding time on the welding strength were further investigated. It was found that there were optimal values for the depolymerizing time, welding pressure, and welding temperature, respectively, for the welding strength, while the welding strength increased with increasing welding time. Through facile surface degradation, the welding pressure was highly reduced, while the welding strength was increased. With surface depolymerization, the welding strength was 1.55-times higher, but the magnitude of press force was 1/1000-times than that with no surface depolymerization. It is elucidative that surface depolymerization can be used to weld hard vitrimer composites alongside reducing the press force effectively.
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41
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Liu Y, Yu Z, Xu X, Wang B, Feng H, Li P, Zhu J, Ma S. Crystallizable Aliphatic Chains Enhanced Covalent Adaptable Networks: Fast Reprocessing and Improved Performance. Macromol Rapid Commun 2022; 43:e2200379. [PMID: 35730398 DOI: 10.1002/marc.202200379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 05/27/2022] [Indexed: 11/08/2022]
Abstract
Covalent adaptable networks (CANs) exhibit recyclability such as reprocessing, but it's a challenge to address the contradiction between reprocessing rate and performance. Here we innovatively introduce pendent aliphatic chain anhydride monoesters into epoxy CANs based on transesterification, which efficiently accelerates the reprocessing without sacrificing thermal and mechanical properties. The transesterification rate is raised on account of the flexible aliphatic chain-promoted segment movement and dynamic transfer auto-catalysis. When the carbon number reflecting the length of the pendent chain is 12, the epoxy CAN exhibits the fastest stress relaxation or reprocessing. Computation via molecular dynamics simulation demonstrates that the increased segmental mobility from the pendent aliphatic chains contributes to the enhanced reprocessability. Interestingly, the crystallization of the pendent aliphatic chains maintains or even improves the thermal and mechanical properties. Thus, introducing flexible and crystallizable aliphatic side chain is an innovative and efficient approach to accelerate dynamic reactions and network arrangement while improving performance. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Yanlin Liu
- Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province, Laboratory of Polymers and Composites, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China
| | - Zhen Yu
- Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province, Laboratory of Polymers and Composites, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China
| | - Xiwei Xu
- Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province, Laboratory of Polymers and Composites, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Binbo Wang
- Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province, Laboratory of Polymers and Composites, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Hongzhi Feng
- Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province, Laboratory of Polymers and Composites, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Pengyun Li
- Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province, Laboratory of Polymers and Composites, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Jin Zhu
- Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province, Laboratory of Polymers and Composites, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China
| | - Songqi Ma
- Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province, Laboratory of Polymers and Composites, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China
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42
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Zhao S, Yang H, Zhao B, Cao L, Wang D, Russell TP. Homogenizing Blends of Cross-linked Polymers by Interfacial Exchange Reactions. ACS APPLIED MATERIALS & INTERFACES 2022; 14:27309-27316. [PMID: 35649264 DOI: 10.1021/acsami.2c06916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Obtaining homogeneous blends of two covalently cross-linked polymers by mechanical mixing is not possible due to their permanent network topologies. Here, we demonstrate an effective route to prepare polymer blends from the common cross-linked epoxidized natural rubber (ENR) and epoxy resin vitrimer (EV) by mechanical mixing. Interfacial exchange reactions between these two networks occur by a dynamic transesterification. The as-prepared ENR-EV blends show excellent mechanical strength, extensibility, and thermal stability. Moreover, they also show typical vitrimeric properties, including self-healing, welding, and reprocessability. This work demonstrates a large-scale preparation of vitrimeric materials with high performance and versatility from commercially available polymers and affords a promising strategy to recycle both waste rubbers and resins.
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Affiliation(s)
- Shizhen Zhao
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering & State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Hongkun Yang
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering & State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Bin Zhao
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering & State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Lifang Cao
- School of Chemistry, Tiangong University, Tianjin 300387, China
| | - Dong Wang
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering & State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Thomas P Russell
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering & State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
- Polymer Science and Engineering Department, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
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43
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Abdur Rashid M, Liu W, Wei Y, Jiang Q. Review of reversible dynamic bonds containing intrinsically flame retardant biomass thermosets. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111263] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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44
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Reprocessable Polybenzoxazine Thermosets with High T gs and Mechanical Strength Retentions Using Boronic Ester Bonds as Crosslinkages. Polymers (Basel) 2022; 14:polym14112234. [PMID: 35683905 PMCID: PMC9182748 DOI: 10.3390/polym14112234] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Revised: 05/21/2022] [Accepted: 05/23/2022] [Indexed: 01/25/2023] Open
Abstract
In order to obtain reprocessable polybenzoxazine thermosets with high heat resistance and mechanical strength retentions, network structures without irreversible parts were constructed via crosslinking benzoxazine oligomers using boronic ester cross-linkers. Firstly, the benzoxazine monomer containing carbon–carbon double bonds was synthesized via the Mannich reaction. After thermal ring-opening polymerization, the benzoxazine oligomer containing carbon–carbon double bonds (OBZ) was yielded. Through the thiol-ene click reaction of the OBZ and dithiol cross-linker bearing boronic ester bonds, the polybenzoxazine thermosets using boronic ester bonds as crosslinkages (OBZ-BDB) were successfully synthesized. The structures of OBZ and OBZ-BDB were characterized by SEC, 1H NMR, and FT-IR measurements. Reprocessing experiments showed that OBZ-BDB has remarkable reprocessability. The retention rates of the tensile strengths through three generations of reprocessing were 98%, 95%, and 84%, respectively. Meanwhile, OBZ-BDB cross-linked by boronic ester bonds had brilliant thermal properties. The Tg of the original OBZ-BDB was 224 °C. With the increase of the reprocessing generations, the Tgs basically remained unchanged.
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Kimura T, Hayashi M. Exploring the effects of bound rubber phase on the physical properties of nano-silica composites with a vitrimer-like bond exchangeable matrix. Polym J 2022. [DOI: 10.1038/s41428-022-00654-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Rashid MA, Liu W, Wei Y, Jiang Q. Review on intrinsically recyclable flame retardant thermosets enabled through covalent bonds. J Appl Polym Sci 2022. [DOI: 10.1002/app.52493] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Muhammad Abdur Rashid
- Center for Civil Aviation Composites Donghua University, 2999 North Renmin Road Shanghai, 201620 China
- Key Laboratory of Textile Science & Technology, Ministry of Education, College of Textiles Donghua University, 2999 North Renmin Road Shanghai, 201620 China
- Dhaka University of Engineering & Technology Gazipur‐1707 Bangladesh
| | - Wanshuang Liu
- Center for Civil Aviation Composites Donghua University, 2999 North Renmin Road Shanghai, 201620 China
- Key Laboratory of Textile Science & Technology, Ministry of Education, College of Textiles Donghua University, 2999 North Renmin Road Shanghai, 201620 China
| | - Yi Wei
- Center for Civil Aviation Composites Donghua University, 2999 North Renmin Road Shanghai, 201620 China
- Key Laboratory of Textile Science & Technology, Ministry of Education, College of Textiles Donghua University, 2999 North Renmin Road Shanghai, 201620 China
| | - Qiuran Jiang
- Key Laboratory of Textile Science & Technology, Ministry of Education, College of Textiles Donghua University, 2999 North Renmin Road Shanghai, 201620 China
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Alfarhan S, Brown J, Liu B, Long T, Jin K. Chemically recyclable crosslinked thiol‐ene photopolymers via thiol‐disulfide exchange reactions. JOURNAL OF POLYMER SCIENCE 2022. [DOI: 10.1002/pol.20220131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Saleh Alfarhan
- Chemical Engineering, School for Engineering of Matter, Transport and Energy Arizona State University Tempe Arizona USA
| | - James Brown
- Chemistry, School of Molecular Sciences Arizona State University Tempe Arizona USA
- Biodesign Center for Sustainable Macromolecular Materials and Manufacturing Arizona State University Tempe Arizona USA
| | - Boer Liu
- Chemistry, School of Molecular Sciences Arizona State University Tempe Arizona USA
- Biodesign Center for Sustainable Macromolecular Materials and Manufacturing Arizona State University Tempe Arizona USA
| | - Timothy Long
- Chemical Engineering, School for Engineering of Matter, Transport and Energy Arizona State University Tempe Arizona USA
- Chemistry, School of Molecular Sciences Arizona State University Tempe Arizona USA
- Biodesign Center for Sustainable Macromolecular Materials and Manufacturing Arizona State University Tempe Arizona USA
| | - Kailong Jin
- Chemical Engineering, School for Engineering of Matter, Transport and Energy Arizona State University Tempe Arizona USA
- Biodesign Center for Sustainable Macromolecular Materials and Manufacturing Arizona State University Tempe Arizona USA
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Chen JH, Lu JH, Pu XL, Chen L, Wang YZ. Recyclable, malleable and intrinsically flame-retardant epoxy resin with catalytic transesterification. CHEMOSPHERE 2022; 294:133778. [PMID: 35093421 DOI: 10.1016/j.chemosphere.2022.133778] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 01/23/2022] [Accepted: 01/26/2022] [Indexed: 06/14/2023]
Abstract
Flame retardancy and recyclability are two important issues in the research field of thermosets, particularly for epoxy resin (EP) with the biggest market share. It is of great importance, but rarely achievable, to integrate these properties simultaneously into EP. Herein, we report a facile way to prepare intrinsically flame-retardant epoxy vitrimers combining rapid recycling and multiple shape memory effects by introducing dynamic ester-linkages with catalytic transesterification activity into the crosslinking networks of EP. The flame-retardant epoxy vitrimers exhibited high Tg (∼110.7 °C), desirable thermal stability and excellent flame retardancy with UL-94 V-0 rating, and high LOI of ∼34%. Also, the value of the peak heat release rate (PHRR) and the total heat release (THR) showed 63% and 32% reduction, respectively. Meanwhile, flame-retardant epoxy vitrimers showed high malleability that could be reprocessed in 15 min at 200 °C without sacrificing the mechanical properties and flame retardancy. Moreover, the dynamic transesterification network allowed flame-retardant EP to access multiple shape memory effect. The design of flame-retardant epoxy vitrimers provide a prime example to foster the cyclic utilization of flame-retardant thermosetting polymers.
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Affiliation(s)
- Jia-Hui Chen
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Jia-Hui Lu
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Xiao-Lu Pu
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Li Chen
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China.
| | - Yu-Zhong Wang
- The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China
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Oba Y, Kimura T, Hayashi M, Yamamoto K. Correlation between Self-Assembled Nanostructures and Bond Exchange Properties for Polyacrylate-Based Vitrimer-like Materials with a Trans- N-Alkylation Bond Exchange Mechanism. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c02406] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Yuta Oba
- Department of Life Science and Applied Chemistry, Graduated School of Engineering,Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Takahiro Kimura
- Department of Life Science and Applied Chemistry, Graduated School of Engineering,Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Mikihiro Hayashi
- Department of Life Science and Applied Chemistry, Graduated School of Engineering,Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Katsuhiro Yamamoto
- Department of Life Science and Applied Chemistry, Graduated School of Engineering,Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
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