(Eur. Polym. J.) Synthesis of Fully Bio-based Diepoxy Monomer with Dicyclo Diacetal for High-performance, Readily Degradable Thermosets
作者：Wangchao Yuan, Songqi Ma,* Sheng Wang, Qiong Li, Binbo Wang, Xiwei Xu, Kaifeng Huang
關(guān)鍵字：lignin，biomass，renewable resources，cyclic acetal ，recycle
論文來源：期刊
具體來源：European Polymer Journal
發(fā)表時(shí)間：2019年
Thermosets are very versatile owing to their high dimensional stability, chemical resistance and thermal and mechanical properties; however, they are difficult to be recycled or reworked because of their permanent cross-linked structure. In this paper, we synthesized a novel fully bio-based diepoxy monomer via acetalization of lignin derivative vanillin with bio-based polyol erythritol followed by reacting with bio-derived epichlorohydrin. Due to the degradability of dicyclo diacetal structure in the diepoxy monomer, the cross-linked epoxy network could be readily decomposed (completely dissolved in 1M HCl solution at 50 °C within 40 min). While it was stable under neutral and basic conditions even during hot-humid aging test. Meanwhile, due to the rigidity of the dicyclo diacetal structure, it showed high glass transition temperature of 184 °C, and its modulus (4.7 GPa) and hardness (0.30 GPa) are even higher than those of conventional bisphenol A epoxy resin.
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