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
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
Construction & Building Technology
Wenwen Guo, Fuwei Liang, Shun Chen, Liping Jin, Chenpeng Ji, Ping Zhang, Bin Fei
Summary: A novel intrinsically flame-retardant bio-based epoxy resin was prepared by curing the synthesized cardanol-derived epoxy monomer (CFEP) and a DOPO-based curing agent (DPDM). The resin exhibited enhanced thermal stability, mechanical properties and fire-retardant performance compared to commercial epoxy thermosets.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Multidisciplinary
Yanlin Liu, Binbo Wang, Songqi Ma, Tao Yu, Xiwei Xu, Qiong Li, Sheng Wang, Yingying Han, Zhen Yu, Jin Zhu
Summary: The study introduces fully bio-based catalyst-free epoxy vitrimers for Carbon Fiber Reinforced Composites (CFRCs), showing exceptional malleability and reprocessability through compression molding. The material also demonstrates outstanding degradability, allowing for multiple recoveries of carbon fibers without damage.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Polymer Science
Lorena Saitta, Giuliana Rizzo, Claudio Tosto, Gianluca Cicala, Ignazio Blanco, Eugenio Pergolizzi, Romeo Ciobanu, Giuseppe Recca
Summary: Currently, there are concerns about the non-recyclability of epoxy resins in the market, as well as their synthesis via petroleum-based raw materials which limit their usage. Therefore, finding environmentally friendly alternatives for epoxy formulation is crucial. This paper explores a Cradle-to-Cradle approach to ensure the infinite reuse of epoxy resins, starting with a fully recyclable bio-based epoxy formulation and obtaining a recycled polymer that can be mixed with the same formulation. The approach provides a sustainable disposal route for epoxy resin and offers a green component for the primary bio-based epoxy matrix.
Article
Engineering, Environmental
Fatemeh Shahkarami, Nasrin Moini, Koroush Kabiri, Farideh Piri, Arash Jahandideh
Summary: Nowadays, the priority is to adopt green chemistry to prevent the devastating effects of global warming and environmental pollution. A greener approach involving microwave irradiation was used to engineer a partially-bio-based hardener for epoxy resins. The star-shaped oligoaniline hardener showed enhanced thermal stability and conductivity, making it suitable for the fabrication of conductive composites and thermal resistance anticorrosive coatings.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Polymer Science
Grigorii K. Sterligov, Sergey A. Rzhevskiy, Dilshodakhon K. Isaeva, Nikita M. Belov, Maria A. Rasskazova, Egor A. Drokin, Maxim A. Topchiy, Lidiya Minaeva, Alexander Babkin, Erdni M. Erdni-Goryaev, Alexey Kepman, Andrey F. Asachenko
Summary: A green thermally stable hardener was synthesized and used as a curing agent for epoxy resins. The new hardener provided the polymer matrix with necessary physical and mechanical characteristics and increased toughness. DMA analysis showed that cured matrices with the new hardener had excellent mechanical properties, making it suitable for high-temperature applications in composite materials.
Article
Chemistry, Applied
Ching-Wen Lou, Ya Wang, Yuxiao Wang, Xuefei Zhang, Yanting Wang, Xiaomeng Wang, Hai-Tao Ren, Ting-Ting Li, Jia-Horng Lin, Bing-Chiuan Shiu
Summary: A molecular design strategy combining reversible imine bond, chain motion, and thermosensitive hydrogen bond has been proposed to improve the toughness of self-healing materials. The resulting elastomer exhibits high self-healing efficiency and corrosion resistance, and can be spun into conductive filaments with a core-shell structure.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Materials Science, Characterization & Testing
Hechen Liu, Zhanglin Sun, Liwei Wei, Yunpeng Liu, Songsong Zhou, Qi Ge, Chang Liu, Xinyang Li
Summary: In this study, a vitrimer resin with double-dynamic bonds was built by introducing a ester-exchange catalyst and disulfide (S-S) bonds into the crosslinked network. The results showed that the resin exhibited excellent electrical insulation and its dynamic properties increased with the increasing number of S-S bonds, significantly enhancing the repair efficiency and damage repair scale. Additionally, the resin had degradability and thermally elastic shape memory properties, allowing for non-destructive recycling of valuable materials and processable remodelling.
Article
Materials Science, Characterization & Testing
Seung-Mo Hong, Seok-Ho Hwang
Summary: Two epoxy hardeners with different molecular weights were synthesized and used as crosslinkers for bisphenol-A epoxy resin via the thiolepoxy click reaction. The results showed that the molecular weight of the hardeners affected the curing kinetics and final properties of the epoxy networks, with the low-molecular-weight hardener showing higher reactivity and adhesion strength.
Article
Polymer Science
Madhu Chennapuram, Yoshiaki Yoshida, Takeshi Endo
Summary: The study shows that EDTADA can act as a self-sustaining accelerant for the curing reaction of epoxy monomers and also works as an amine catalyst for esterification. The curing reaction of glycidol with EDTADA proceeds successfully via an initiation step due to the esterification of primary alcohol and anhydride moieties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Xiaohong Liu, Ending Zhang, Zhiqiang Feng, Jiaming Liu, Bifang Chen, Liyan Liang
Summary: In this study, two bio-based imine epoxy vitrimers were prepared using biomass energy vanillin, m-xylylenediamine and 1, 6-hexanediamine as raw materials, showing excellent thermal stability, solvent resistance, and degradability. These vitrimers have the potential to be used as sustainable structural materials due to their simple process, excellent comprehensive properties, and degradability.
JOURNAL OF MATERIALS SCIENCE
(2021)
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
Polymer Science
Pirada Sudprasert, Shotaro Kariya, Kenji Ogino, Suwabun Chirachanchai, Shinji Kanehashi
Summary: In this study, a novel bio-based epoxy polymer was successfully prepared from cardanol derivatives and characterized for its various properties. The epoxy polymers showed flexibility, thermal stability, and antimicrobial activity against bacteria. The molecular weight of the epoxy prepolymer significantly influenced the drying property, and thermal treatment improved the hardness, thermal stability, and mechanical strength.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Engineering, Environmental
Zizhao Qian, Yuanxiang Xiao, Xujun Zhang, Qing Li, Lujie Wang, Feiya Fu, Hongyan Diao, Xiangdong Liu
Summary: This study reports a novel amidation route to tailor diphenolic acid (DPA) and produce high-performance epoxy resins. Compared to the traditional bisphenol A (BPA), the amide-modified DPA showed lower toxicity and exhibited autocatalytic effect during curing reactions. Dynamic mechanical analyses and tensile test results confirmed the outstanding thermo-mechanical properties of the amide-modified DPA-derived epoxy resins, which can be attributed to increased cross-linking density and enhanced hydrogen bonding. Additionally, the amide-modified DPA derivatives also showed potential as excellent interfaces between the resin and cotton fibers, making them suitable for bio-based composite materials.
CHEMICAL ENGINEERING JOURNAL
(2022)