Epoxy resin thermosets (ERTs) are an important class of polymeric materials. However, owing to their highly cross-linked nature, they suffer from poor recyclability, which contributes to an unacceptable level of environmental pollution. There is a clear need for the design of inherently recyclable ERTs that are based on renewable resources. We present the synthesis and closed-loop recycling of a fully lignocellulose-derivable epoxy resin (DGF/MBCA), prepared from dimethyl ester of 2,5-furandicarboxylic acid (DMFD), 4,4′-methylenebis(cyclohexylamine) (MBCA), and glycidol, which displays excellent thermomechanical properties (a glass transition temperature of 170°C, and a storage modulus at 25°C of 1.2 gigapascals). Notably, the material undergoes methanolysis in the absence of any catalyst, regenerating 90% of the original DMFD. The diamine MBCA and glycidol can subsequently be reformed by acetolysis. Application and recycling of DGF/MBCA in glass and plant fiber composites are demonstrated.

中文翻译：

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甲醇分解生物质衍生的环氧胺热固性材料的闭环可回收性

环氧树脂热固性材料（ERT）是一类重要的聚合材料。然而，由于其高度交联的性质，它们的可回收性较差，这导致了不可接受的环境污染。显然需要设计基于可再生资源的本质上可回收的 ERT。我们介绍了由 2,5-呋喃二甲酸二甲酯 (DMFD)、4,4'-亚甲基双(环己胺) (MBCA) 制备的完全木质纤维素衍生环氧树脂 (DGF/MBCA) 的合成和闭环回收和缩水甘油，具有优异的热机械性能（玻璃化转变温度为 170°C，25°C 时的储能模量为 1.2 吉帕斯卡）。值得注意的是，该材料在没有任何催化剂的情况下进行甲醇分解，再生 90% 的原始 DMFD。二胺 MBCA 和缩水甘油随后可通过丙酮水解重新形成。展示了 DGF/MBCA 在玻璃和植物纤维复合材料中的应用和回收。