Abstract 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 1 M 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.

中文翻译：

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用双环二缩醛合成全生物基双环氧单体以制备高性能、易降解的热固性塑料

摘要 热固性塑料因其高尺寸稳定性、耐化学性以及热和机械性能而用途广泛。然而，由于它们的永久性交联结构，它们很难回收或返工。在本文中，我们通过木质素衍生物香草醛与生物基多元醇赤藓糖醇的缩醛化，然后与生物衍生的环氧氯丙烷反应，合成了一种新型的全生物基双环氧单体。由于双环氧单体中双环二缩醛结构的可降解性，交联的环氧网络很容易分解（在 50°C 下在 40 分钟内完全溶解在 1 M HCl 溶液中）。在中性和碱性条件下，即使在湿热老化试验中也很稳定。同时，由于双环二缩醛结构的刚性，