Article
Materials Science, Multidisciplinary
Dan Zhao, Xue Liang, Jiewen Wang, Jianzhong Du, Yunqing Zhu
Summary: This study presents a simple and effective approach to synthesize degradable polyurethanes with high bio-based carbon content and desirable mechanical properties by sourcing diols and isocyanates from biorenewable resources and introducing degradability via the Tishchenko reaction. The obtained polyurethanes can be completely degraded in a NaOH solution, expanding the end-of-life options.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Applied
Lianghui Gong, Shuaipeng Wang, Jingyuan Hu, Haoyang Feng, Li Zhang, Jinyue Dai, Xiaoqin Liu
Summary: Designing a reinforced and degradable vitrimer with efficient dynamic bond exchange is difficult but urgently necessary. In this study, intramolecular hydrogen bonds derived from bio-based resources were used to prepare reinforced and catalyst-free vitrimers. The resulting materials, DM-3SH and DT-3SH, showed excellent mechanical properties, recyclability, and degradation. The incorporation of intramolecular hydrogen bonds enhanced and accelerated dynamic bond exchange and degradation, contributing to the sustainable development of thermosetting resin.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Chemistry, Multidisciplinary
Keita Saito, Fabian Eisenreich, Tankut Turel, Zeljko Tomovic
Summary: The research demonstrates the selective chemical depolymerization of polycarbonate using a vanillin derivative, leading to the development of novel reprocessable poly(imine-carbonate)s with excellent recyclability, providing new insights into the design of bio-based circular polymers.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Environmental
Picheng Chen, Yu Ding, Yanqing Wang, Hongzhe Zhao, Pengcheng Li, Yuetao Liu, Chuanhui Gao
Summary: In this study, a new regulatory strategy using conjugated structures and functional compounds was proposed to enhance the toughness and stability of vitrimers. The design of crosslinking points was optimized to lower the energy barrier for imine bond exchange, which accelerated the exchange rate of covalent bonds. By increasing the crosslinking density, the vitrimer exhibited increased strain under external forces. Additionally, the synthesized vitrimer showed excellent welding, healing, and shape memory performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Yunlong Ma, Ruiyang Li, Shichang Luo, Xiran Shen, Rao Tao, Yinghua Jin, Wei Zhang, Li Qiu
Summary: Malleable conductive poly(imide-imine) hybrid (PIIH) vitrimer-graphene aerogel (GA) composites with good mechanical strength, reprocessability, and conductivity have been prepared. These composites show potential for use in flexible and stretchable electronics.
CHINESE JOURNAL OF CHEMISTRY
(2023)
Article
Agricultural Engineering
Dong-Mei Xie, De-Xin Lu, Xiao-Li Zhao, Yi-Dong Li, Jian-Bing Zeng
Summary: Malleable polyurethane networks were prepared from CSO and VSB, with VSB serving as both a structure modifier to regulate mechanical properties and a provider of dynamic imine bonds for malleability, thermal processability, and recyclability.
INDUSTRIAL CROPS AND PRODUCTS
(2021)
Article
Materials Science, Composites
Weijun Yang, Hui Ding, Wei Zhou, Tianxi Liu, Pengwu Xu, Debora Puglia, Jose M. Kenny, Piming Ma
Summary: In this study, vanillin-based epoxy monomers were synthesized to develop epoxy vitrimer materials with good flame retardancy and degradability. The material exhibited different mechanical properties by adjusting the monomer ratio. Moreover, the material showed excellent self-healing capability and reprocessability, and carbon fiber reinforced epoxy composites could be fully recycled.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Dan Meng, Kaihao Wang, Wenjia Wang, Jun Sun, Haiqiao Wang, Xiaoyu Gu, Sheng Zhang
Summary: In this study, a novel bio-based flame retardant coating was developed on flexible polyurethane foam (FPUF) by chemically reacting sodium alginate (OSA) and polydopamine (PDA), followed by depositing nanorod-like beta-FeOOH molecules. The coated FPUF samples showed a limiting oxygen index of 25.5%, a 45.0% reduction in peak heat release rate, and a 69.1% decrease in smoke density compared to control FPUF samples. The proposed mechanism involved the decomposition of OSA-PDA-beta-FeOOH during combustion to promote the formation of compact crosslinked char and release inert gases, as well as the transformation of beta-FeOOH to Fe2O3 to settle smoke particles and reduce smoke release. Additionally, the coating exhibited antibacterial ability due to its shark skin-like structure.
Article
Chemistry, Multidisciplinary
Yi Liu, Ming-Liang Wu, Yi-Dong Li, Ling-Yu Li, Jian-Bing Zeng
Summary: This study reports fully biobased and mechanically robust elastomeric vitrimers based on dynamic imine bonds prepared from epoxidized natural rubber (ENR), vanillin, and 1,10-decanediamine. These elastomers show improved tensile strength, elasticity, and stress relaxation compared to conventional ENR-derived rubbers. With the combination of mechanical robustness, reprocessability, and recyclability, they exhibit potential as sustainable substitutes to conventional ENR-derived rubbers.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Polymer Science
C. Monteserin, M. Blanco, N. Uranga, J. Sanchez, J. M. Laza, J. L. Vilas, E. Aranzabe
Summary: In this study, a sustainable epoxy vitrimer was developed and successfully applied to the production of greener composites. The vitrimer showed good reprocessability and recyclability, as well as good adhesion with fibers. The resulting composites exhibited excellent thermal and mechanical properties for lightweight engineering applications. Additionally, the chemical recyclability and compostability of the composites were demonstrated.
Article
Engineering, Biomedical
Yihao Liu, Haoyi Niu, Chengwei Wang, Xiaoxiao Yang, Wentao Li, Yuxin Zhang, Xiaojun Ma, Yuanjing Xu, Pengfei Zheng, Jinwu Wang, Kerong Dai
Summary: This study developed a new hydrogel material with biocompatibility, easy degradation, and wound healing properties using physical electrostatic cross-linking and freeze-drying. The material showed excellent antibacterial and pro-coagulation abilities, promoting hemostasis and reducing blood loss in both in vitro and in vivo experiments. Additionally, it exhibited superior cytocompatibility and biodegradability. Therefore, this material has great potential for clinical application as a hemostatic and wound healing material.
BIOACTIVE MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Chumeng Luo, Weichao Wang, Wei Yang, Xingyu Liu, Jun Lin, Liqun Zhang, Shaojian He
Summary: In this study, a novel hardener was designed to prepare an epoxy vitrimer with dual-dynamic covalent bonds. The experimental results showed that EPV-4-AFD-VAN outperformed the single-disulfide-containing vitrimer in terms of performance, and it maintained good recovery properties and solvent resistance.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Qiang Zhang, Qihang Bu, Jiangyue Xia, Rongxue Sun, Dajing Li, Haibo Luo, Ning Jiang, Cheng Wang
Summary: The purpose of this study was to develop a bio-based nanocomposite coating with good functional activity and self-healing ability for applications in food, materials, and other fields. Plastic coatings cause environmental pollution, so replacing them with degradable coatings is a good solution. However, the development of degradable coatings in the food and materials fields is restricted by their insufficient antibacterial ability and weak comprehensive properties. Therefore, chitosan nanoparticles loaded with gallic acid were self-assembled with gelatin to prepare high-performance, degradable, self-healing bio-based nanocomposite coatings with antibacterial and antioxidant properties.
Article
Chemistry, Applied
Chang Li, Benzhi Ju, Shufen Zhang
Summary: 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, better solvent resistance, and reprocessing performance compared to traditional starch-based materials. Due 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.
CARBOHYDRATE POLYMERS
(2023)
Article
Biotechnology & Applied Microbiology
Longfei Yin, Fengwei Yin, Dan Huang, Weilong Zheng, Lan Li, Yongqian Fu
Summary: With the development of modern industry, the priority now lies in replacing ordinary plastic products with environmentally friendly antibacterial materials. In this study, a degradable composite membrane of cellulose/glycerin/chitosan (CGC) was prepared, showing improved antibacterial properties. The research offers a low-cost and green method for preparing antibacterial film.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2021)
Article
Polymer Science
Yuanzhang Jiang, Xuyi Wang, Yanting Han, Dakai Gong, Yingchun Gu, Lin Tan
Summary: In this study, FeCl3 and poly(acrylic acid) (PAA) were doped into waterborne polyurethanes (WPUs) to create multifunctional materials with self-healing and antimicrobial properties. WPU/Fe/PAA-5.5, containing 5.5 wt % PAA, exhibited excellent mechanical properties, strong self-healing capabilities, and an impressive antimicrobial rate of over 90%. These supramolecular films were also highly recyclable through hot-pressing.
Article
Polymer Science
Longyu Tian, Min Wang, Guangming Liao, Baoliang Liu, Sujuan Zhang, Yucheng Sun, Zhen Meng, Jintao Zhang, Zaijun Lu
Summary: Two kinds of benzoxazine monomers were synthesized and used to prepare polybenzoxazine anion exchange membranes (AEMs) with quaternary ammonium functionalization. The LQPBZ AEM exhibited better ion conductivity and alkaline stability.
Article
Polymer Science
Claire A. Lemarchand
Summary: This study investigates the shock behavior of three different polymers through molecular dynamics simulations. The results reveal specificities in the shock behavior of polymers, including deviations from the linear relation between shock velocity and particle velocity, as well as differences in shear stress relaxation behind the shock front. It is found that the deviation of the Hugoniot locus is related to the change in the relative contribution of bonding and non-bonding potential energies, while polymers with higher glass transition temperatures exhibit slower shear stress relaxation.
Article
Polymer Science
Zengquan Liu, Xiaochun Yin, He Zhang, Shuo Gao, Qinglin Kuang, Yanhong Feng
Summary: A powder solid-state extension (PSSE) technology was proposed to address the high melt viscosity issue of UHMWPE. By uniaxial extension and sintering in the solid state, a highly self-reinforced material was prepared. X-ray diffraction and scattering techniques were used to study the structural evolution during the PSSE process, and a solid-phase induced transformation model was established.
Article
Polymer Science
Zhike Li, Anyu Luo, Rui Zhou, Xin Li, Haiyan Li
Summary: A novel high temperature resistance IL@SiO2 nanocapsules were successfully prepared and their friction and wear properties in PA6 composites were studied. The addition of IL@SiO2 nanocapsules reduced the friction coefficient and wear rate without affecting the mechanical properties of PA6. The synergy between the IL core and SiO2 wall in the nanocapsules improved the self-lubricating performance of the PA6 composites.
Article
Polymer Science
Xin Liu, Xuhong Guo, Qi Liao
Summary: In this study, an algorithm for accurately estimating viscosity is developed using molecular dynamics simulations and the Green-Kubo formula. This algorithm can be applied to complex systems with long correlations, such as macromolecular and biological simulation systems.
Article
Polymer Science
Hao Pu, Yun-Lei Hou, Jing -Zhou Chen, Dong -Lin Zhao
Summary: The use of modified graphene improves the interfacial adherence of carbon fibers to epoxy resin, resulting in enhanced interfacial and bending properties of CF and matrix in CF/EP composites, as well as increased interlaminar shear strength and flexural strength.
Article
Polymer Science
Wei-Chung Ke, Jin-Wei Lin, Manohar Reddy Busireddy, Yueh-Hsing Lee, Jiun-Tai Chen, Chain-Shu Hsu
Summary: This study introduces a crosslinkable monomer, TAIC, to synthesize three crosslinked polyimide films, which exhibit improved thermal, mechanical, and dielectric properties. The introduction of TAIC enhances the tensile strength, reduces the dielectric constant and dielectric loss, and decreases the coefficient of thermal expansion of the polyimide films.
Article
Polymer Science
Alex Kwasi Kumi, Ruiling Fan, Ye Chen, Yumei Zhang
Summary: The difference in leaching of amylopectin from cellulose/amylopectin/1-butyl-3-methylimidazolium chloride ([Bmim][Cl]) blends during regeneration in water and aqueous ethanol has been studied. Molecular dynamics simulations showed that the dissolution and regeneration mechanisms of amylopectin in [Bmim][Cl] are similar to cellulose in ionic liquids. Water regeneration leads to weak electrostatic interactions, resulting in high leaching of amylopectin. In contrast, ethanol-water interactions enhance electrostatic interactions among amylopectin chains, limiting amylopectin leaching in aqueous ethanol.
Article
Polymer Science
Xi Zeng, Junwei Zhou, Junbiao Peng, Chunsheng Zhang, Danling Wang, Yihu Song, Qiang Zheng
Summary: This study utilizes an oligomer deep eutectic solvent (DES) based on polyethylene glycol to regulate the vulcanization kinetics of rubber. The results show that the DES can accelerate vulcanization at low temperatures without affecting the crosslinking density and Mullins effect.
Article
Polymer Science
Qianqian Yue, Yongfei Peng, Xingjian Liu, Aihua He, Huarong Nie
Summary: The addition of metal deactivators can effectively suppress the aging of TBIR, prolong its lifespan, and have no negative effects on its physical and processing properties. These research findings are of great importance for improving the stability and aging resistance of polymers.
Article
Polymer Science
J. Gomez-Caturla, J. Ivorra-Martinez, R. Tejada-Oliveros, V Moreno, D. Garcia-Garcia, R. Balart
Summary: This work focuses on the development of environmentally friendly PLA formulations by using different esters derived from geraniol as plasticizers. The results show that these esters have good compatibility with PLA, and they can effectively enhance the elongation and plasticity of PLA, reduce its glass transition temperature, and slightly improve its water absorption capabilities.
Article
Polymer Science
Dandan Li, Zhaohui Lu, Zhao Ke, Ke Xu, Fengna Dai, Youhai Yu, Guangtao Qian, Chunhai Chen
Summary: In this study, cross-linked PI aerogel membranes with low dielectric constant and high moisture resistance were prepared by co-polymerization and scraping coating technology. The incorporation of fluorinated blocks and benzimidazole ring structures resulted in novel PI aerogel membranes with fascinating dielectric properties and outstanding moisture resistance.
Article
Polymer Science
Zhaoyang Chu, Qing Zhang, Haihua Luo, Han Zhou, Fapei Zhang, Wei Chen, Wenhua Zhang
Summary: Multi-physical fields solution processing strategy is a universal and facile method for preparing various conjugated polymer films and high-performance devices. In this study, we employed a combined microfluidic flow and ultrasonication strategy (FU) for processing CP solutions, and found a pronounced synergetic effect in promoting the pre-ordering of chains in solution. The conformation order and anisotropy of the solution were revealed through various characterizations. A non-classical nucleation model for polymer crystallization in non-equilibrium solution processing was confirmed. The roles of microfluidic flow and ultrasonication in chain aggregation and crystallization were addressed through multi-physical simulations. Compared to pristine solutions, the FU strategy showed improved solution anisotropy and crystallization kinetics, resulting in higher crystallinity in films and increased mobilities in OFET devices. The FU processing strategy provides a universal approach for regulating chain conformation and aggregation in conjugated polymer solutions.