1
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Mangal M, H S, Bose S, Banerjee T. Innovations in applications and prospects of non-isocyanate polyurethane bioplastics. Biopolymers 2023; 114:e23568. [PMID: 37846654 DOI: 10.1002/bip.23568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 09/22/2023] [Accepted: 09/28/2023] [Indexed: 10/18/2023]
Abstract
Currently, conventional plastics are necessary for a variety of aspects of modern daily life, including applications in the fields of healthcare, technology, and construction. However, they could also contain potentially hazardous compounds like isocyanates, whose degradation has a negative impact on both the environment and human health. Therefore, researchers are exploring alternatives to plastic which is sustainable and environmentally friendly without compromising its mechanical and physical features. This review study highlights the production of highly eco-friendly bioplastic as an efficient alternative to non-biodegradable conventional plastic. Bioplastics are produced from various renewable biomass sources such as plant debris, fatty acids, and oils. Poly-addition of di-isocyanates and polyols is a technique employed over decades to produce polyurethanes (PUs) bioplastics from renewable biomass feedstock. The toxicity of isocyanates is a major concern with the above-mentioned approach. Novel green synthetic approaches for polyurethanes without using isocyanates have been attracting greater interest in recent years to overcome the toxicity of isocyanate-containing raw materials. The polyaddition of cyclic carbonates (CCs) and polyfunctional amines appears to be the most promising method to obtain non-isocyanate polyurethanes (NIPUs). This method results in the creation of polymeric materials with distinctive and adaptable features with the elimination of harmful compounds. Consequently, non-isocyanate polyurethanes represent a new class of green polymeric materials. In this review study, we have discussed the possibility of creating novel NIPUs from renewable feedstocks in the context of the growing demand for efficient and ecologically friendly plastic products.
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Affiliation(s)
- Mangal Mangal
- Department of Chemical Engineering, Indian Institute of Technology, Guwahati, Assam, India
| | - Supriya H
- Department of Materials Engineering, Indian Institute of Science, Bengaluru, India
| | - Suryasarathi Bose
- Department of Materials Engineering, Indian Institute of Science, Bengaluru, India
| | - Tamal Banerjee
- Department of Chemical Engineering, Indian Institute of Technology, Guwahati, Assam, India
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2
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Iswanto AH, Lubis MAR, Sutiawan J, Al-Edrus SSO, Lee SH, Antov P, Kristak L, Reh R, Mardawati E, Santoso A, Kusumah SS. Latest Advancements in the Development of High-Performance Lignin- and Tannin-Based Non-Isocyanate Polyurethane Adhesive for Wood Composites. Polymers (Basel) 2023; 15:3864. [PMID: 37835913 PMCID: PMC10575091 DOI: 10.3390/polym15193864] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 09/11/2023] [Accepted: 09/18/2023] [Indexed: 10/15/2023] Open
Abstract
The depletion of natural resources and increasing environmental apprehension regarding the reduction of harmful isocyanates employed in manufacturing polyurethanes (PUs) have generated significant attention from both industrial and academic sectors. This attention is focused on advancing bio-based non-isocyanate polyurethane (NIPU) resins as viable and sustainable substitutes, possessing satisfactory properties. This review presents a comprehensive analysis of the progress made in developing bio-based NIPU polymers for wood adhesive applications. The main aim of this paper is to conduct a comprehensive analysis of the latest advancements in the production of high-performance bio-based NIPU resins derived from lignin and tannin for wood composites. A comprehensive evaluation was conducted on scholarly publications retrieved from the Scopus database, encompassing the period from January 2010 to April 2023. In NIPU adhesive manufacturing, the exploration of substitute materials for isocyanates is imperative, due to their inherent toxicity, high cost, and limited availability. The process of demethylation and carbonation of lignin and tannin has the potential to produce polyphenolic compounds that possess hydroxyl and carbonyl functional groups. Bio-based NIPUs can be synthesized through the reaction involving diamine molecules. Previous studies have provided evidence indicating that NIPUs derived from lignin and tannin exhibit enhanced mechanical properties, decreased curing temperatures and shortened pressing durations, and are devoid of isocyanates. The characterization of NIPU adhesives based on lignin and tannin was conducted using various analytical techniques, including Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), matrix-assisted laser desorption/ionization with time-of-flight (MALDI-TOF) mass spectrometry, and gel permeation chromatography (GPC). The adhesive performance of tannin-based NIPU resins was shown to be superior to that of lignin-based NIPUs. This paper elucidates the potential of lignin and tannin as alternate sources for polyols in the manufacturing of NIPUs, specifically for their application as wood adhesives.
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Affiliation(s)
- Apri Heri Iswanto
- Department of Forest Product, Faculty of Forestry, Universitas Sumatera Utara, Medan 20155, Indonesia;
| | - Muhammad Adly Rahandi Lubis
- Research Center for Biomass and Bioproducts, National Research and Innovation Agency, Cibinong 16911, Indonesia; (M.A.R.L.); (A.S.); (S.S.K.)
- Research Collaboration Center for Biomass and Biorefinery between BRIN and Universitas Padjadjaran, National Research and Innovation Agency, Bandung 40600, Indonesia;
| | - Jajang Sutiawan
- Department of Forest Product, Faculty of Forestry, Universitas Sumatera Utara, Medan 20155, Indonesia;
- Research Center for Biomass and Bioproducts, National Research and Innovation Agency, Cibinong 16911, Indonesia; (M.A.R.L.); (A.S.); (S.S.K.)
| | | | - Seng Hua Lee
- Department of Wood Industry, Faculty of Applied Sciences, Universiti Teknologi MARA (UiTM), Kampus Jengka, Pahang 26400, Malaysia;
| | - Petar Antov
- Faculty of Forest Industry, University of Forestry, 1797 Sofia, Bulgaria;
| | - Lubos Kristak
- Faculty of Wood Sciences and Technology, Technical University in Zvolen, 96001 Zvolen, Slovakia; (L.K.); (R.R.)
| | - Roman Reh
- Faculty of Wood Sciences and Technology, Technical University in Zvolen, 96001 Zvolen, Slovakia; (L.K.); (R.R.)
| | - Efri Mardawati
- Research Collaboration Center for Biomass and Biorefinery between BRIN and Universitas Padjadjaran, National Research and Innovation Agency, Bandung 40600, Indonesia;
- Department of Agro-Industrial Technology, Universitas Padjadjaran, Jatinangor 40600, Indonesia
| | - Adi Santoso
- Research Center for Biomass and Bioproducts, National Research and Innovation Agency, Cibinong 16911, Indonesia; (M.A.R.L.); (A.S.); (S.S.K.)
| | - Sukma Surya Kusumah
- Research Center for Biomass and Bioproducts, National Research and Innovation Agency, Cibinong 16911, Indonesia; (M.A.R.L.); (A.S.); (S.S.K.)
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3
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Abstract
Polyurethane (PU) foams are produced from toxic, petrochemical- and phosgene-derived isocyanates. Although nonisocyanate polyurethane (NIPU) has shown promise as a replacement for traditional PU, the synthesis of NIPU foams has not been widely studied due to the difficulties in replicating the foaming process of PU, in situ CO2 production through the hydrolysis of isocyanates. Hereby, we report the synthesis of amine-CO2 adducts and their CO2 adsorption-desorption characteristics under different conditions. The results show that the amine-CO2 adducts can exhibit up to 87% CO2 desorption at 60 °C after aminolysis with cyclic carbonate. The amine-CO2 adduct is used as both a foaming agent and a comonomer to obtain low-density foams (0.203-0.239 g·cm-3) after heating at 50-60 °C for 24-48 h. This marks the successful synthesis of in situ CO2-blown NIPU foams using an amine-CO2 adduct.
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Affiliation(s)
- Ping Sen Choong
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Singapore 627833, Republic of Singapore
| | - Yen Li Eunice Hui
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Singapore 627833, Republic of Singapore
| | - Chen Chuan Lim
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Singapore 627833, Republic of Singapore
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Eckardt J, Sepperer T, Cesprini E, Šket P, Tondi G. Comparing Condensed and Hydrolysable Tannins for Mechanical Foaming of Furanic Foams: Synthesis and Characterization. Molecules 2023; 28:molecules28062799. [PMID: 36985772 PMCID: PMC10056537 DOI: 10.3390/molecules28062799] [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: 02/17/2023] [Revised: 03/15/2023] [Accepted: 03/16/2023] [Indexed: 03/30/2023] Open
Abstract
This study examined the potential of hydrolysable tannin in comparison to condensed tannins for the production of furanic foams. The results indicate that chestnut tannin presents lower reactivity and requires a stronger acid for the polymerization. Additionally, foamability and density were found to be dependent on both surfactant concentration and tannin type, allowing lower densities for mimosa tannin and lower thermal conductivities for chestnut-based foams. Mimosa tannin was found to have the highest compression strength, followed by quebracho and chestnut, promising thermal conductivity of around 50 mW/m·K for 300 kg/m3 foams, which suggests that chestnut foams have the potential to performing highly when the density is reduced. Chemical analysis revealed that the methylene moieties of the furanics are non-specific and produces new covalent bonds with nucleophilic substrates: -OH groups and free-positions in the flavonoids. Overall, this study opens new perspectives for the application of hydrolysable tannins in polymer and material science.
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Affiliation(s)
- Jonas Eckardt
- TESAF Department, University of Padua, Viale dell'Università 16, 35020 Legnaro, Italy
| | - Thomas Sepperer
- Department of Green Engineering and Circular Design, Salzburg University of Applied Sciences, Marktstraße 136a, 5431 Kuchl, Austria
| | - Emanuele Cesprini
- TESAF Department, University of Padua, Viale dell'Università 16, 35020 Legnaro, Italy
| | - Primož Šket
- Slovenian NMR Center, National Institute of Chemistry, 1000 Ljubljana, Slovenia
| | - Gianluca Tondi
- TESAF Department, University of Padua, Viale dell'Università 16, 35020 Legnaro, Italy
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5
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Purwanto NS, Chen Y, Wang T, Torkelson JM. Rapidly synthesized, self-blowing, non-isocyanate Polyurethane network foams with reprocessing to bulk networks via hydroxyurethane dynamic chemistry. POLYMER 2023. [DOI: 10.1016/j.polymer.2023.125858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2023]
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6
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Zhang B, Chen X, Pizzi A, Petrissans M, Dumarcay S, Petrissans A, Zhou X, Du G, Colin B, Xi X. Highly Branched Tannin-Tris(2-aminoethyl)amine-Urea Wood Adhesives. Polymers (Basel) 2023; 15:polym15040890. [PMID: 36850174 PMCID: PMC9960572 DOI: 10.3390/polym15040890] [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: 01/26/2023] [Revised: 02/04/2023] [Accepted: 02/08/2023] [Indexed: 02/16/2023] Open
Abstract
Condensed tannin copolymerized with hyperbranched tris(2-aminoethyl)amine-urea formed by amine-amido deamination yields a particleboard thermosetting adhesive without any aldehydes satisfying the requirements of relevant standards for the particleboard internal bond strength. The tannin-triamine-urea cures well at 180 °C, a relatively low temperature for today's particleboard hot pressing. As aldehydes were not used, the formaldehyde emission was found to be zero, not even in traces due to the heating of wood. The effect is ascribed to the presence of many reactive sites, such as amide, amino, and phenolic groups belonging to the three reagents used. The tannin appears to function as an additional cross-linking agent, almost a nucleating agent, for the triamine-urea hyperbranched oligomers. Chemical analysis by MALDI ToF and 13C NMR has shown that the predominant cross-linking reaction is that of the substitution of the tannin phenolic hydroxyls by the amino groups of the triamine. The reaction of tannin with the still-free amide groups of urea is rather rare, but it may occur with the rarer tannin flavonoid units in which the heterocyclic ring is opened. Due to the temperature gradient between the surfaces and the board core in the particleboard during hot pressing, the type and the relative balance of covalent and ionic bonds in the resin structure may differ in the surfaces and the board core.
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Affiliation(s)
- Bengang Zhang
- LERMAB, IUT Hubert Curien, University of Lorraine, 7 rue Fusillés Résistance, 88000 Epinal, France
| | - Xinyi Chen
- LERMAB-ENSTIB, University of Lorraine, 27 rue Philippe Seguin, 88000 Epinal, France
- Yunnan Key Laboratory of Wood Adhesives and Glue Products, College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China
| | - Antonio Pizzi
- LERMAB-ENSTIB, University of Lorraine, 27 rue Philippe Seguin, 88000 Epinal, France
- Correspondence:
| | - Mathieu Petrissans
- LERMAB, IUT Hubert Curien, University of Lorraine, 7 rue Fusillés Résistance, 88000 Epinal, France
| | - Stephane Dumarcay
- LERMAB, Faculté des Sciences, University of Lorraine, Blvd. des Aiguillettes, 54000 Nancy, France
| | - Anelie Petrissans
- LERMAB, IUT Hubert Curien, University of Lorraine, 7 rue Fusillés Résistance, 88000 Epinal, France
| | - Xiaojian Zhou
- Yunnan Key Laboratory of Wood Adhesives and Glue Products, College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China
| | - Guanben Du
- Yunnan Key Laboratory of Wood Adhesives and Glue Products, College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China
| | - Baptiste Colin
- LERMAB, IUT Hubert Curien, University of Lorraine, 7 rue Fusillés Résistance, 88000 Epinal, France
| | - Xuedong Xi
- Yunnan Key Laboratory of Wood Adhesives and Glue Products, College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China
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7
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Recent Progress of Non-Isocyanate Polyurethane Foam and Their Challenges. Polymers (Basel) 2023; 15:polym15020254. [PMID: 36679134 PMCID: PMC9866265 DOI: 10.3390/polym15020254] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 12/28/2022] [Accepted: 12/30/2022] [Indexed: 01/06/2023] Open
Abstract
Polyurethane foams (PUFs) are a significant group of polymeric foam materials. Thanks to their outstanding mechanical, chemical, and physical properties, they are implemented successfully in a wide range of applications. Conventionally, PUFs are obtained in polyaddition reactions between polyols, diisoycyanate, and water to get a CO2 foaming agent. The toxicity of isocyanate has attracted considerable attention from both scientists and industry professionals to explore cleaner synthesis routes for polyurethanes excluding the use of isocyanate. The polyaddition of cyclic carbonates (CCs) and polyfunctional amines in the presence of an external blowing agent or by self-blowing appears to be the most promising route to substitute the conventional PUFs process and to produce isocyanate-free polyurethane foams (NIPUFs). Especially for polyhydroxyurethane foams (PHUFs), the use of a blowing agent is essential to regenerate the gas responsible for the creation of the cells that are the basis of the foam. In this review, we report on the use of different blowing agents, such as Poly(methylhydrogensiloxane) (PHMS) and liquid fluorohydrocarbons for the preparation of NIPUFs. Furthermore, the preparation of NIPUFs using the self-blowing technique to produce gas without external blowing agents is assessed. Finally, various biologically derived NIPUFs are presented, including self-blown NIPUFs and NIPUFs with an external blowing agent.
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8
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Bourguignon M, Grignard B, Detrembleur C. Water-Induced Self-Blown Non-Isocyanate Polyurethane Foams. Angew Chem Int Ed Engl 2022; 61:e202213422. [PMID: 36278827 DOI: 10.1002/anie.202213422] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Indexed: 11/18/2022]
Abstract
For 80 years, polyisocyanates and polyols were central building blocks for the industrial fabrication of polyurethane (PU) foams. By their partial hydrolysis, isocyanates release CO2 that expands the PU network. Substituting this toxic isocyanate-based chemistry by a more sustainable variant-that in situ forms CO2 by hydrolysis of a comonomer-is urgently needed for producing greener cellular materials. Herein, we report a facile, up-scalable process, potentially compatible to existing infrastructures, to rapidly prepare water-induced self-blown non-isocyanate polyurethane (NIPU) foams. We show that formulations composed of poly(cyclic carbonate)s and polyamines furnish rigid or flexible NIPU foams by partial hydrolysis of cyclic carbonates in the presence of a catalyst. By utilizing readily available low cost starting materials, this simple but robust process gives access to greener PU foams, expectedly responding to the sustainability demands of many sectors.
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Affiliation(s)
- Maxime Bourguignon
- Center for Education and Research on Macromolecules(CERM), CESAM Research Unit, University of Liège, Department of Chemistry, Sart-Tilman, B6A, 4000, Liège, Belgium
| | - Bruno Grignard
- Center for Education and Research on Macromolecules(CERM), CESAM Research Unit, University of Liège, Department of Chemistry, Sart-Tilman, B6A, 4000, Liège, Belgium
| | - Christophe Detrembleur
- Center for Education and Research on Macromolecules(CERM), CESAM Research Unit, University of Liège, Department of Chemistry, Sart-Tilman, B6A, 4000, Liège, Belgium
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9
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Valette V, Kébir N, Tiavarison FB, Burel F, Lecamp L. Preparation of flexible biobased non-isocyanate polyurethane (NIPU) foams using the transurethanization approach. REACT FUNCT POLYM 2022. [DOI: 10.1016/j.reactfunctpolym.2022.105416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/07/2022]
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10
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Non-Isocyanate Polyurethane Bio-Foam with Inherent Heat and Fire Resistance. Polymers (Basel) 2022; 14:polym14225019. [PMID: 36433146 PMCID: PMC9697988 DOI: 10.3390/polym14225019] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 11/11/2022] [Accepted: 11/17/2022] [Indexed: 11/22/2022] Open
Abstract
Polyurethanes (PUs) are versatile and widespread, particularly as flexible and rigid foams. To avoid isocyanates and other toxic reagents required for synthesis, such as phosgene, alternative synthetic routes have been utilized to produce non-isocyanate polyurethanes (NIPUs). A thermally and flame-resistant rigid NIPU was produced from environmentally benign and bio-sourced ingredients, requiring no catalyst or solvents. A foamed structure was obtained by the addition of glutaraldehyde and four different carboxylic acids: malic acid, maleic acid, citric acid, and aconitic acid. The resulting morphology, thermal degradation, and flame resistance of each foam were compared. The properties vary with each carboxylic acid used, but in each case, peak thermal degradation and peak heat release are postponed by >100 °C compared to commercial rigid PU foam. Furthermore, in a butane torch test, NIPU foams exhibit an 80% higher remaining mass and a 75% reduction in afterburn time, compared to commercial polyurethane. This bio-based polyurethane eliminates the hazards of traditional PUs, while imparting inherent thermal stability and flame resistance uncharacteristic of conventional foams.
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11
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Sainz-Urruela C, Vera-López S, Paz San Andrés M, Díez-Pascual AM. Surface functionalization of graphene oxide with tannic acid: Covalent vs non-covalent approaches. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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12
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Monie F, Grignard B, Detrembleur C. Divergent Aminolysis Approach for Constructing Recyclable Self-Blown Nonisocyanate Polyurethane Foams. ACS Macro Lett 2022; 11:236-242. [PMID: 35574775 DOI: 10.1021/acsmacrolett.1c00793] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
We report an approach to fabricate self-blown nonisocyanate polyurethane (NIPU) foams by capitalizing on the divergent chemistries of amines with cyclic carbonates─creating the polymer network─and thiolactone─delivering in situ a thiol that generates the blowing agent (CO2) by reaction with a cyclic carbonate. Multiple linkages (hydroxyurethanes, thioethers, and amides) are created within the polymer network by this domino process. This one-pot methodology furnishes flexible to rigid foams with open-cell morphology at moderate temperature. The foams are easily repurposed into films or structural composites by thermal treatment, showing the first example of recyclable NIPU foams. Remarkably, both the formation and the recycling of the thermoset foams do not necessarily require the use of a catalyst. This facile and robust process is opening new avenues for designing more sustainable PU foams and offers new end-of-life options by facile material repurposing.
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Affiliation(s)
- Florent Monie
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, Department of Chemistry, University of Liège, Sart-Tilman, B6A, 4000 Liège, Belgium
| | - Bruno Grignard
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, Department of Chemistry, University of Liège, Sart-Tilman, B6A, 4000 Liège, Belgium
| | - Christophe Detrembleur
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, Department of Chemistry, University of Liège, Sart-Tilman, B6A, 4000 Liège, Belgium
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13
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Gomez-Lopez A, Elizalde F, Calvo I, Sardon H. Trends in non-isocyanate polyurethane (NIPU) development. Chem Commun (Camb) 2021; 57:12254-12265. [PMID: 34709246 DOI: 10.1039/d1cc05009e] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The transition towards safer and more sustainable production of polymers has led to a growing body of academic research into non-isocyanate polyurethanes (NIPUs) as potential replacements for conventional, isocyanate-based polyurethane materials. This perspective article focuses on the opportunities and current limitations of NIPUs produced by the reaction between biobased cyclic carbonates with amines, which offers an interesting pathway to renewable NIPUs. While it was initially thought that due to the similarities in the chemical structure, NIPUs could be used to directly replace conventional polyurethanes (PU), this has proven to be more challenging to achieve in practice. As a result, and in spite of the vast amount of academic research into this topic, the market size of NIPUs remains negligible. In this perspective, we will emphasize the main limitations of NIPUs in comparison to conventional PUs and the most significant advances made by others and us to overcome these limitations. Finally, we provide our personal view of where research should be directed to promote the transition from the academic to the industrial sector.
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Affiliation(s)
- Alvaro Gomez-Lopez
- POLYMAT and Department of Polymers and Advanced Materials: Physics, Chemistry and Technology, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizabal 3, 20018, Donostia-San Sebastián, Spain.
| | - Fermin Elizalde
- POLYMAT and Department of Polymers and Advanced Materials: Physics, Chemistry and Technology, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizabal 3, 20018, Donostia-San Sebastián, Spain.
| | - Iñigo Calvo
- ORIBAY Group Automotive S.L. R&D Department, Portuetxe bidea 18, 20018, Donostia-San Sebastián, Spain
| | - Haritz Sardon
- POLYMAT and Department of Polymers and Advanced Materials: Physics, Chemistry and Technology, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizabal 3, 20018, Donostia-San Sebastián, Spain.
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14
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Bio-Based Polyurethane Resins Derived from Tannin: Source, Synthesis, Characterisation, and Application. FORESTS 2021. [DOI: 10.3390/f12111516] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Tannins are soluble, astringent secondary phenolic metabolites generally obtained from renewable natural resources, and can be found in many plant parts, such as fruits, stems, leaves, seeds, roots, buds, and tree barks, where they have a protective function against bacterial, fungal, and insect attacks. In general, tannins can be extracted using hot water or organic solvents from the bark, leaves, and stems of plants. Industrially, tannins are applied to produce adhesives, wood coatings, and other applications in the wood and polymer industries. In addition, tannins can also be used as a renewable and environmentally friendly material to manufacture bio-based polyurethanes (bio-PUs) to reduce or eliminate the toxicity of isocyanates used in their manufacture. Tannin-based bio-PUs can improve the mechanical and thermal properties of polymers used in the automotive, wood, and construction industries. The various uses of tannins need to be put into perspective with regards to possible further advances and future potential for value-added applications. Tannins are employed in a wide range of industrial applications, including the production of leather and wood adhesives, accounting for almost 90% of the global commercial tannin output. The shortage of natural resources, as well as the growing environmental concerns related to the reduction of harmful emissions of formaldehyde or isocyanates used in the production of polyurethanes, have driven the industrial and academic interest towards the development of tannin-based bio-PUs as sustainable alternative materials with satisfactory characteristics. The aim of the present review is to comprehensively summarize the current state of research in the field of development, characterization, and application of tannin-derived, bio-based polyurethane resins. The successful synthesis process of the tannin-based bio-PUs was characterized by Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), MALDI-TOF mass spectrometry, and gel permeation chromatography (GPC) analyses.
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15
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Non-Furanic Humins-Based Non-Isocyanate Polyurethane (NIPU) Thermoset Wood Adhesives. Polymers (Basel) 2021; 13:polym13030372. [PMID: 33504084 PMCID: PMC7865859 DOI: 10.3390/polym13030372] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 01/15/2021] [Accepted: 01/17/2021] [Indexed: 11/17/2022] Open
Abstract
Predominantly non-furanic commercial humins were used to prepare humin-based non-isocyanate polyurethane (NIPU) resins for wood panel adhesives. Pure humin-based NIPU resins and tannin–humin NIPU resins were prepared, the latter to upgrade the humins’ performance. Species in the raw humins and species formed in the NIPU resins were identified by Matrix Assisted Laser Desorption Ionization Time of Flight (MALDI ToF) spectrometry and Fourier Transform Infrared (FTIR). Humins, fulvic acid and derivatives, humic acid and its fragments, some lignans present and furanic oligomers present formed NIPU linkages. Thermomechanical analysis (TMA) showed that as with other biomaterials-based NIPU resins, all these resins also showed two temperature peaks of curing, the first around 130 °C and the second around 220 °C. A decrease in the Modulus of Elasticity (MOE) between the two indicated that the first curing period corresponded to linear growth of the oligomers forming a physical entanglement network. This then disentangled, and the second corresponded to the formation of a chemical cross-linked network. This second peak was more evident for the tannin–humin NIPU resins. All the laboratory particleboard made and tested either bonded with pure humins or with tannin–humin NIPU adhesives satisfied well the internal bond strength requirements of the relevant standard for interior grade panels. The tannin–humin adhesives performed clearly better than the pure humins one.
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Abstract
This review critically addresses the most relevant and innovative techniques for obtaining polymers from tannins.
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Affiliation(s)
- Myleidi Vera
- Department of Polymer
- Faculty of Chemistry Science
- University of Concepción
- Concepción
- Chile
| | - Bruno F. Urbano
- Department of Polymer
- Faculty of Chemistry Science
- University of Concepción
- Concepción
- Chile
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Chen X, Guigo N, Pizzi A, Sbirrazzuoli N, Li B, Fredon E, Gerardin C. Ambient Temperature Self-Blowing Tannin-Humins Biofoams. Polymers (Basel) 2020; 12:polym12112732. [PMID: 33213107 PMCID: PMC7698803 DOI: 10.3390/polym12112732] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 11/15/2020] [Accepted: 11/17/2020] [Indexed: 11/16/2022] Open
Abstract
Ambient temperature self-blowing tannin-furanic foams have been prepared by substituting a great part-even a majority-of furfuryl alcohol with humins, a polyfuranic material derived from the acid treatment at high temperature of fructose. Closed-cell foams were prepared at room temperature and curing, while interconnected-cell foams were prepared at 80 °C and curing, this being due to the more vigorous evaporation of the solvent. These foams appear to present similar characteristics as other tannin-furanic foams based only on furfuryl alcohol. A series of tannin-humins-furfuryl alcohol oligomer structures have been defined indicating that all three reagents co-react. Humins appeared to react well with condensed tannins, even higher molecular weight humins species, and even at ambient temperature, but they react slower than furfuryl alcohol. This is due to their high average molecular weight and high viscosity, causing their reaction with other species to be diffusion controlled. Thus, small increases in solvent led to foams with less cracks and open structures. It showed that furfuryl alcohol appears to also have a role as a humins solvent, and not just as a co-reagent and self-polymerization heat generator for foam expansion and hardening. Stress-strain for the different foams showed a higher compressive strength for both the foam with the lowest and the highest proportion of humins, thus in the dominant proportions of either furfuryl alcohol or the humins. Thus, due to their slower reactivity as their proportion increases to a certain critical level, more of them do proportionally participate within the expansion/curing time of the foam to the reaction.
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Affiliation(s)
- Xinyi Chen
- LERMAB, University of Lorraine, 27 rue Philippe Seguin, 88000 Epinal, France; (X.C.); (E.F.)
| | - Nathanael Guigo
- Department of Chemistry, University of the Cote d’Azur, 06103 Nice, France; (N.G.); (N.S.); (B.L.)
| | - Antonio Pizzi
- LERMAB, University of Lorraine, 27 rue Philippe Seguin, 88000 Epinal, France; (X.C.); (E.F.)
- Correspondence:
| | - Nicolas Sbirrazzuoli
- Department of Chemistry, University of the Cote d’Azur, 06103 Nice, France; (N.G.); (N.S.); (B.L.)
| | - Bin Li
- Department of Chemistry, University of the Cote d’Azur, 06103 Nice, France; (N.G.); (N.S.); (B.L.)
| | - Emmanuel Fredon
- LERMAB, University of Lorraine, 27 rue Philippe Seguin, 88000 Epinal, France; (X.C.); (E.F.)
| | - Christine Gerardin
- LERMAB, University of Lorraine, Boulevard des Aiguillettes, 54000 Nancy, France;
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