1
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Noda T, Tanaka A, Akae Y, Kohsaka Y. Unsaturated polyurethanes degradable by conjugate substitution reactions with amines and carboxylate anions. RSC Adv 2023; 13:20336-20341. [PMID: 37425630 PMCID: PMC10327625 DOI: 10.1039/d3ra03461e] [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: 05/24/2023] [Accepted: 06/29/2023] [Indexed: 07/11/2023] Open
Abstract
Main-chain scission of polymers induces a significant decrease in molecular weight and accompanying changes in physical properties and is important for applications in materials engineering, such as in photoresists and adhesive dismantling. In this study, we focused on methacrylates substituted with carbamate groups at the allylic positions for the purpose of developing a mechanism that efficiently cleaves the main chain in response to chemical stimuli. Dimethacrylates substituted with hydroxy groups at the allylic positions were synthesized by the Morita-Baylis-Hillman reaction of diacrylates and aldehydes. The polyaddition with diisocyanates afforded a series of poly(conjugated ester-urethane)s. These polymers underwent a conjugate substitution reaction with diethylamine or acetate anion at 25 °C, resulting in main-chain scission accompanied by decarboxylation. A side reaction by the re-attack of the liberated amine end to the methacrylate skeleton proceeded, whereas it was suppressed for the polymers with an allylic substitute of the phenyl group. Therefore, the methacrylate skeleton substituted with phenyl and carbamate groups at the allylic position is an excellent decomposition point that induces selective and quantitative main-chain scission with weak nucleophiles, such as carboxylate anions.
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Affiliation(s)
- Takumi Noda
- Faculty of Textile Science and Technology, Shinshu University 3-15-1 Tokida Ueda Nagano 386-8657 Japan
| | - Anri Tanaka
- Faculty of Textile Science and Technology, Shinshu University 3-15-1 Tokida Ueda Nagano 386-8657 Japan
| | - Yosuke Akae
- Faculty of Textile Science and Technology, Shinshu University 3-15-1 Tokida Ueda Nagano 386-8657 Japan
- Japan Society for the Promotion of Science (JSPS) Tokyo Japan
| | - Yasuhiro Kohsaka
- Faculty of Textile Science and Technology, Shinshu University 3-15-1 Tokida Ueda Nagano 386-8657 Japan
- Research Initiative for Supra-Materials (RISM), Shinshu University Japan +81-268-21-5488
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2
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Wang Z, Debuigne A. Radical Polymerization of Methylene Heterocyclic Compounds: Functional Polymer Synthesis and Applications. POLYM REV 2023. [DOI: 10.1080/15583724.2023.2181819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Affiliation(s)
- Zhuoqun Wang
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, Chemistry Department, University of Liege, Liege, Belgium
| | - Antoine Debuigne
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, Chemistry Department, University of Liege, Liege, Belgium
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3
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Pei Y, Li X, Zeng G, Gao Y, Wen T. Chiral stationary phases based on lactide derivatives for high-performance liquid chromatography. J Chromatogr A 2021; 1661:462705. [PMID: 34879306 DOI: 10.1016/j.chroma.2021.462705] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 11/12/2021] [Accepted: 11/23/2021] [Indexed: 01/02/2023]
Abstract
Lactide is a natural and renewable lactone cyclic ester-containing intrinsic chiral center, providing an affordable natural compound that is potential for the development of chiral polymers. In this work, we reported two novel chiral stationary phases (CSPs) based on lactide derivatives, methylene lactide (MLA), for high-performance liquid chromatography (HPLC). By using free radical polymerization, chemically bonded CSPs of poly(methylene lactide) (PMLA) and side-chain modified PMLA by aminolysis (N-PMLA) can be prepared. Also, poly(l-lactic acid) (PLLA) was prepared as a control. The chiral resolution performance of the chromatographic columns was examined in both reversed-phase and normal-phase modes. PMLA and N-PMLA CSPs exhibited fairly good chiral recognition ability, whereas the separation ability of PLLA is much weaker. This work provides a new platform for the development of high-performance CSPs from affordable natural products.
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Affiliation(s)
- Yuanyuan Pei
- South China Advanced Institute for Soft Matter Science and Technology, School of Molecular Science and Engineering, South China University of Technology, Guangzhou, China 510640; Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices, South China University of Technology, Guangzhou, China 510640
| | - Xinyu Li
- South China Advanced Institute for Soft Matter Science and Technology, School of Molecular Science and Engineering, South China University of Technology, Guangzhou, China 510640; Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices, South China University of Technology, Guangzhou, China 510640
| | - Guangjian Zeng
- South China Advanced Institute for Soft Matter Science and Technology, School of Molecular Science and Engineering, South China University of Technology, Guangzhou, China 510640; Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices, South China University of Technology, Guangzhou, China 510640
| | - Yuting Gao
- South China Advanced Institute for Soft Matter Science and Technology, School of Molecular Science and Engineering, South China University of Technology, Guangzhou, China 510640; Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices, South China University of Technology, Guangzhou, China 510640
| | - Tao Wen
- South China Advanced Institute for Soft Matter Science and Technology, School of Molecular Science and Engineering, South China University of Technology, Guangzhou, China 510640; Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices, South China University of Technology, Guangzhou, China 510640.
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4
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Wang Z, Vertruyen B, Taghipour H, Detrembleur C, Debuigne A. CO 2-Derived Methylene Oxazolidinone: A Platform Building Block for Functionalizing Ethylene–Vinyl Alcohol Copolymers. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01895] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhuoqun Wang
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, Department of Chemistry, University of Liege, Allée de la Chimie B6A, 4000 Liège, Belgium
| | - Bénédicte Vertruyen
- LCIS─GreenMAT, CESAM Research Unit, Department of Chemistry, University of Liege, Allée de la Chimie B6A, 4000 Liège, Belgium
| | - Hamid Taghipour
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, Department of Chemistry, University of Liege, Allée de la Chimie B6A, 4000 Liège, Belgium
| | - Christophe Detrembleur
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, Department of Chemistry, University of Liege, Allée de la Chimie B6A, 4000 Liège, Belgium
| | - Antoine Debuigne
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, Department of Chemistry, University of Liege, Allée de la Chimie B6A, 4000 Liège, Belgium
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5
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Mekpothi T, Meepowpan P, Sriyai M, Molloy R, Punyodom W. Novel Poly(Methylenelactide- g-L-Lactide) Graft Copolymers Synthesized by a Combination of Vinyl Addition and Ring-Opening Polymerizations. Polymers (Basel) 2021; 13:3374. [PMID: 34641191 PMCID: PMC8512580 DOI: 10.3390/polym13193374] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 09/18/2021] [Accepted: 09/21/2021] [Indexed: 11/16/2022] Open
Abstract
In this work, a novel poly (methylenelactide-g-L-lactide), P(MLA-g-LLA) graft copolymer was synthesized from poly(methylenelactide) (PMLA) and L-lactide (LLA) using 0.03 mol% liquid tin(II) n-butoxide (Sn(OnBu)2) as an initiator by a combination of vinyl addition and ring-opening polymerization (ROP) at 120 °C for 72 h. Proton and carbon-13 nuclear magnetic resonance spectroscopy (1H- and 13C-NMR) and Fourier-transform infrared spectroscopy (FT-IR) confirmed the grafted structure of P(MLA-g-LLA). The P(MLA-g-LLA) melting temperatures (Tm) range of 144-164 °C, which was lower than that of PLA (170-180 °C), while the thermal decomposition temperature (Td) of around 314-335 °C was higher than that of PLA (approx. 300 °C). These results indicated that the grafting reaction could widen the melt processing range of PLA and in doing so increase PLA's thermal stability during melt processing. The graft copolymers were obtained with weight-average molecular weights (M¯w) = 4200-11,000 g mol-1 and a narrow dispersity (Đ = 1.1-1.4).
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Affiliation(s)
- Tanyaluck Mekpothi
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; (T.M.); (P.M.)
- Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Puttinan Meepowpan
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; (T.M.); (P.M.)
- Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
- Bioplastics Production Laboratory for Medical Applications, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;
| | - Montira Sriyai
- Bioplastics Production Laboratory for Medical Applications, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;
- Center of Excellence in Materials Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand;
- Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Robert Molloy
- Center of Excellence in Materials Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand;
- Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Winita Punyodom
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; (T.M.); (P.M.)
- Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
- Bioplastics Production Laboratory for Medical Applications, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;
- Center of Excellence in Materials Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand;
- Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
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6
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Fouilloux H, Thomas CM. Production and Polymerization of Biobased Acrylates and Analogs. Macromol Rapid Commun 2021; 42:e2000530. [DOI: 10.1002/marc.202000530] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 11/23/2020] [Indexed: 12/13/2022]
Affiliation(s)
- Hugo Fouilloux
- PSL University Chimie ParisTech CNRS Institut de Recherche de Chimie Paris Paris 75005 France
| | - Christophe M. Thomas
- PSL University Chimie ParisTech CNRS Institut de Recherche de Chimie Paris Paris 75005 France
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7
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Botvin V, Karaseva S, Salikova D, Dusselier M. Syntheses and chemical transformations of glycolide and lactide as monomers for biodegradable polymers. Polym Degrad Stab 2021. [DOI: 10.1016/j.polymdegradstab.2020.109427] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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8
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Goseki R, Miyai S, Uchida S, Ishizone T. Polymerizability of exomethylene monomers based on adamantyl frameworks. Polym Chem 2021. [DOI: 10.1039/d1py00500f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We evaluated the polymerizability of novel exomethylene monomers based on an adamantyl skeleton, 2-methyleneadamantane (MAd) and 2-allylideneadamantane (AAd), under anionic, cationic, and radical conditions.
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Affiliation(s)
- Raita Goseki
- Department of Chemical Science and Engineering
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Shogo Miyai
- Department of Chemical Science and Engineering
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Satoshi Uchida
- Department of Chemical Science and Engineering
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Takashi Ishizone
- Department of Chemical Science and Engineering
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
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9
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Wang Z, Detrembleur C, Debuigne A. Reversible deactivation radical (co)polymerization of dimethyl methylene oxazolidinone towards responsive vicinal aminoalcohol-containing copolymers. Polym Chem 2020. [DOI: 10.1039/d0py01255f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Well-defined oxazolidinone-containing copolymers produced by controlled radical polymerization give access to multi-responsive vicinal amino-alcohol functional poly(vinyl alcohol)s.
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Affiliation(s)
- Zhuoqun Wang
- Center for Education and Research on Macromolecules (CERM)
- CESAM Research Unit
- University of Liege
- 4000 Liege
- Belgium
| | - Christophe Detrembleur
- Center for Education and Research on Macromolecules (CERM)
- CESAM Research Unit
- University of Liege
- 4000 Liege
- Belgium
| | - Antoine Debuigne
- Center for Education and Research on Macromolecules (CERM)
- CESAM Research Unit
- University of Liege
- 4000 Liege
- Belgium
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10
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Wang Z, Poli R, Detrembleur C, Debuigne A. Organometallic-Mediated Radical (Co)polymerization of γ-Methylene-γ-Butyrolactone: Access to pH-Responsive Poly(vinyl alcohol) Derivatives. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01838] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhuoqun Wang
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, Department of Chemistry, University of Liege, Allée de la Chimie B6A, 4000 Liège, Belgium
| | - Rinaldo Poli
- CNRS, LCC (Laboratoire de Chimie de Coordination) and Université de Toulouse, UPS, INPT, 205 route de Narbonne, BP 44099, 31077 Toulouse Cedex 4, France
- Institut Universitaire de France, 1, rue Descartes, 75231 Paris Cedex 05, France
| | - Christophe Detrembleur
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, Department of Chemistry, University of Liege, Allée de la Chimie B6A, 4000 Liège, Belgium
| | - Antoine Debuigne
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, Department of Chemistry, University of Liege, Allée de la Chimie B6A, 4000 Liège, Belgium
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11
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Zhu JB, Tang X, Falivene L, Caporaso L, Cavallo L, Chen EYX. Organocatalytic Coupling of Bromo-Lactide with Cyclic Ethers and Carbonates to Chiral Bromo-Diesters: NHC or Anion Catalysis? ACS Catal 2017. [DOI: 10.1021/acscatal.7b00794] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jian-Bo Zhu
- Department
of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
| | - Xiaoyan Tang
- Department
of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
| | - Laura Falivene
- King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, Kaust Catalysis
Center, Thuwal 23955-6900, Saudi Arabia
| | - Lucia Caporaso
- Dipartimento
di Chimica e Biologia, Università di Salerno, Via Papa
Paolo Giovanni II, I-84084 Fisciano, Italy
| | - Luigi Cavallo
- King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, Kaust Catalysis
Center, Thuwal 23955-6900, Saudi Arabia
| | - Eugene Y.-X. Chen
- Department
of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
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12
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Xu YC, Ren WM, Zhou H, Gu GG, Lu XB. Functionalized Polyesters with Tunable Degradability Prepared by Controlled Ring-Opening (Co)polymerization of Lactones. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00239] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Yue-Chao Xu
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China
| | - Wei-Min Ren
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China
| | - Hui Zhou
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China
| | - Ge-Ge Gu
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China
| | - Xiao-Bing Lu
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China
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13
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d'Arcy R, Burke J, Tirelli N. Branched polyesters: Preparative strategies and applications. Adv Drug Deliv Rev 2016; 107:60-81. [PMID: 27189232 DOI: 10.1016/j.addr.2016.05.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 04/19/2016] [Accepted: 05/06/2016] [Indexed: 10/21/2022]
Abstract
In the last 20years, the availability of precision chemical tools (e.g. controlled/living polymerizations, 'click' reactions) has determined a step change in the complexity of both the macromolecular architecture and the chemical functionality of biodegradable polyesters. A major part in this evolution has been played by the possibilities that controlled macromolecular branching offers in terms of tailored physical/biological performance. This review paper aims to provide an updated overview of preparative techniques that derive hyperbranched, dendritic, comb, grafted polyesters through polycondensation or ring-opening polymerization mechanisms.
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14
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Britner J, Ritter H. Methylenelactide: vinyl polymerization and spatial reactivity effects. Beilstein J Org Chem 2016; 12:2378-2389. [PMID: 28144306 PMCID: PMC5238530 DOI: 10.3762/bjoc.12.232] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Accepted: 10/26/2016] [Indexed: 12/23/2022] Open
Abstract
The first detailed study on free-radical polymerization, copolymerization and controlled radical polymerization of the cyclic push-pull-type monomer methylenelactide in comparison to the non-cyclic monomer α-acetoxyacrylate is described. The experimental results revealed that methylenelactide undergoes a self-initiated polymerization. The copolymerization parameters of methylenelactide and styrene as well as methyl methacrylate were determined. To predict the copolymerization behavior with other classes of monomers, Q and e values were calculated. Further, reversible addition fragmentation chain transfer (RAFT)-controlled homopolymerization of methylenelactide and copolymerization with N,N-dimethylacrylamide was performed at 70 °C in 1,4-dioxane using AIBN as initiator and 2-(((ethylthio)carbonothioyl)thio)-2-methylpropanoic acid as a transfer agent.
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Affiliation(s)
- Judita Britner
- Institute of Organic Chemistry and Macromolecular Chemistry, Heinrich-Heine-University, Universitätsstraße 1, 40225 Düsseldorf, Germany
| | - Helmut Ritter
- Institute of Organic Chemistry and Macromolecular Chemistry, Heinrich-Heine-University, Universitätsstraße 1, 40225 Düsseldorf, Germany
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15
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Mauldin TC, Wertz JT, Boday DJ. Acrylic Platform from Renewable Resources via a Paradigm Shift in Lactide Polymerization. ACS Macro Lett 2016; 5:544-546. [PMID: 35607223 DOI: 10.1021/acsmacrolett.6b00023] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A new polyacrylate, poly(methylidenelactide), with high thermal stability and derived from biobased resources is reported. This polymer is formed from the radical polymerization of a modified lactide derivative and represents one of the few examples of an acrylic from which the entire mass is bioderived and is made from a simplistic synthesis. Furthermore, poly(methylidenelactide) serves as a foundation for a platform of new acrylic structures, owing to pendant cyclic diesters that are susceptible to postpolymerization modification via simple transesterification chemistry. Several examples of unique acrylics made from poly(methylidenelactide) are synthesized and characterized.
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Affiliation(s)
| | - Jason T. Wertz
- IBM Corporation, Poughkeepsie, New York 12601, United States
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16
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Van Zee NJ, Sanford MJ, Coates GW. Electronic Effects of Aluminum Complexes in the Copolymerization of Propylene Oxide with Tricyclic Anhydrides: Access to Well-Defined, Functionalizable Aliphatic Polyesters. J Am Chem Soc 2016; 138:2755-61. [DOI: 10.1021/jacs.5b12888] [Citation(s) in RCA: 108] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Nathan J. Van Zee
- Department of Chemistry and
Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States
| | - Maria J. Sanford
- Department of Chemistry and
Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States
| | - Geoffrey W. Coates
- Department of Chemistry and
Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States
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17
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Mangalum A, Boadi F, Masand SA, Lalancette RA, Pietrangelo A. A Pb2+-binding polychelatogen derived from thionated lactide. RSC Adv 2016. [DOI: 10.1039/c6ra16230d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The synthesis and characterization of a polychelatogen derived from thionated lactide is reported.
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Affiliation(s)
- A. Mangalum
- Department of Chemistry
- Rutgers University-Newark
- Newark
- USA
| | - F. Boadi
- Department of Chemistry
- Rutgers University-Newark
- Newark
- USA
| | - S. A. Masand
- Department of Chemistry
- Rutgers University-Newark
- Newark
- USA
| | | | - A. Pietrangelo
- Department of Chemistry
- Rutgers University-Newark
- Newark
- USA
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18
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Stukenbroeker TS, Bandar JS, Zhang X, Lambert TH, Waymouth RM. Cyclopropenimine Superbases: Competitive Initiation Processes in Lactide Polymerization. ACS Macro Lett 2015; 4:853-856. [PMID: 26913218 PMCID: PMC4762272 DOI: 10.1021/acsmacrolett.5b00421] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cyclopropenimine superbases were employed to catalyze the ring-opening polymerization of lactide. Polymerization occurred readily in the presence and absence of alcohol initiators. Polymerizations in the absence of alcohol initiators revealed a competitive initiation mechanism involving deprotonation of lactide by the cyclopropenimine to generate an enolate. NMR and MALDI-TOF analysis of the poly(lactides) generated from cyclopropenimines in the absence of alcohol initiators showed acylated lactide and hydroxyl endgroups. Model studies and comparative experiments with guanidine and phosphazene catalysts revealed the subtle influence of the nature of the superbase on competitive initiation processes.
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Affiliation(s)
| | - Jeff S. Bandar
- Department of Chemistry, Columbia University, 3000 Broadway, New York, NY 10027
| | - Xiangyi Zhang
- Department of Chemistry, Stanford University, Stanford CA 94305
| | - Tristan H. Lambert
- Department of Chemistry, Columbia University, 3000 Broadway, New York, NY 10027
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