Article
Chemistry, Multidisciplinary
Xinxin Yang, Chunyu Ren, Xiuxiu Liu, Penghao Sun, Xu Xu, He Liu, Minggui Shen, Shibin Shang, Zhanqian Song
Summary: This study presents a strategy to synthesize NIPUs by reacting CO2 with epoxides, alleviating environmental issues caused by CO2 and toxic isocyanates. The experiment demonstrates that NIPUs have excellent reprocessing and shape memory performance.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Polymer Science
Jingyuan Hu, Chunhong Wang, Jinyue Dai, Na Teng, Shuaipeng Wang, Liyue Zhang, Yaming Jiang, Xiaoqing Liu
Summary: A novel bio-based epoxy resin DGECA was synthesized efficiently and scalably from renewable camphoric acid, exhibiting superior ultraviolet resistance, flexural strength, and impact strength compared to traditional epoxy resins. This work provides a new strategy for synthesizing epoxy resins with excellent UV resistance and high toughness by utilizing unique renewable feedstock structures.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2021)
Article
Chemistry, Multidisciplinary
Hafezeh Nabipour, Xin Wang, Lei Song, Yuan Hu
Summary: The study focused on the development of a fully bio-based epoxy thermoset from syringaldehyde and furfurylamine, which exhibited high glass transition temperature, mechanical strength, intrinsic flame resistance, and antibacterial properties. This bio-based epoxy thermoset showed superior performance compared to petroleum-based epoxy thermosets, making it a promising green substitute for high performance applications in fire safety.
Article
Polymer Science
I Lorero, A. Rodriguez, M. Campo, S. G. Prolongo
Summary: In this work, epoxy/amine resins with different Diels-Alder crosslinking ratios were manufactured, providing a simplified route that enhances sustainability and industrial transferability. The effect of curing temperatures and Diels-Alder crosslinking on the mechanical properties was studied, leading to the identification of an optimal crosslinking ratio that balances recyclability and mechanical properties. The feasibility of monitoring the network reversibility and evolution was demonstrated through DMTA and microhardness analysis.
Article
Chemistry, Multidisciplinary
Kelli M. Hambleton, Joseph F. Stanzione
Summary: A renewable polymer BG, synthesized as a bioinspired alternative to BPA, was transformed into an epoxy resin with good thermomechanical properties. By strategically utilizing a coproduct, the production of BG has the potential to become more economically feasible.
Article
Polymer Science
Hajime Kimura, Keiko Ohtsuka, Morio Yonekawa
Summary: The study investigated the curing behavior of an epoxy resin using two compounds as curing agents, revealing that the reaction between the acid anhydride group and the epoxy group followed by the phenylethynylcarbonyl groups significantly improved heat resistance and flame retardancy of the resulting product. The presence of a small amount of the imide compound enhanced the efficiency of the reaction.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2021)
Article
Polymer Science
Xia Liu, Weifeng Fan, Xiaoniu Yang
Summary: Bio-based multi-armed epoxy oligomers were synthesized and used to prepare epoxy-anhydride thermosets, which exhibited improved thermal and mechanical properties.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Agricultural Engineering
Wenwen Guo, Xin Wang, Jiali Huang, Wei Cai, Lei Song, Yuan Hu
Summary: The phosphorylated cardanol-derived novolac epoxy synthesized in this study exhibits excellent fire-retardant properties and toughening characteristics, serving as a potential renewable alternative to commercial DGEBA to address its flammability and brittleness issues.
INDUSTRIAL CROPS AND PRODUCTS
(2021)
Article
Multidisciplinary Sciences
Sathiyaraj Subramaniyan, Matteo Bergoglio, Marco Sangermano, Minna Hakkarainen
Summary: In order to move towards a circular bioeconomy, a paradigm shift from traditional petroleum-based non-recyclable thermosets to biobased repeatedly recyclable materials is required. Two mechanically and chemically recyclable extended vanillin-derived epoxy thermosets were successfully fabricated by introducing Schiff-base/imine covalent dynamic bonds. These thermosets exhibited good thermal and mechanical properties, stability in common organic solvents, and the ability to be thermally reprocessed through compression molding. Furthermore, they could be rapidly and completely chemically recycled to water-soluble aldehydes and amines by imine hydrolysis in 0.1M HCl solution.
Article
Chemistry, Multidisciplinary
Ying Ge, Xueqin Zhang, You Shi, Yuanbo Cai, Shengtai Zhou, Mei Liang, Huawei Zou
Summary: A novel MCA modified epoxy material with superior flexibility, damping, and durability was synthesized in this study, showing potential for broad application in automotive and aerospace fields.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Review
Polymer Science
Xiao-Li Zhao, Yi-Dong Li, Jian-Bing Zeng
Summary: Biobased epoxy covalent adaptable networks (CANs) are recyclable and degradable polymers with self-healing and reconfigurable functionalities, providing a new approach for the sustainable development of epoxy thermosets.
Article
Materials Science, Multidisciplinary
David Santiago, Dailyn Guzman, Jesu's Padilla, Pere Verdugo, Silvia De la Flor, Angels Serra
Summary: Epoxy-based vitrimers with high Tg values and a homogeneous network structure were developed as recyclable and reprocessable adhesives for automotive structural applications. The materials showed complete stress relaxation in just 3.6 minutes at 180 degrees C, with the presence of TBD catalyst resulting in the fastest relaxation. They were successfully recycled and reprocessed through alcoholysis and mechanical grinding, and demonstrated high single-lap shear stress values for mono- and multimaterial joints. Overall, this study presents a comprehensive investigation of recyclable and reprocessable epoxy-based vitrimers.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Polymer Science
Xiangyun Yin, Zhipeng Xie, Qi Liu, Xubo Yuan, Xin Hou, Jin Zhao
Summary: The addition of CTBN significantly improves the toughness of epoxy resin but decreases its glass transition temperature and modulus, while the addition of CM-β-CD results in a slight increase in modulus and T-g, and a significant improvement in toughness. This work provides a promising pathway for nanocomposites with excellent toughness, with toughening mechanisms attributed to interfacial micro-cracks and energy dissipation of CM-β-CD.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Agricultural Engineering
Chengjiang Lu, Shuai Bian, Ke Hu, Caicai Li, Kaiwen Zheng, Qingfeng Sun
Summary: A high-temperature resistant and flame-retardant resveratrol-based epoxy resin (RESEP) has been synthesized through a simple one-step method. RESEP exhibits excellent thermal stability, flame retardancy, and material properties, making it potentially useful in the fields of electronics and aerospace.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Polymer Science
Bjorn Erik Fristrup Ekbrant, Anne Ladegaard Skov, Anders E. Daugaard
Summary: The study demonstrates the catalytic effects of tertiary amines in amine-epoxy reactions and etherifications in epoxy systems. Experimental results show that different amines exhibit varying preferences in reactions, which can be confirmed through different analytical techniques.