Degradable epoxy resins are designed to address the environmental pollution caused by traditional epoxy resins. However, incorporating the degradability of dynamic covalent bonds in the design of degradable resins often compromises the rigidity and heat resistance of the material, rendering it less suitable for high-temperature applications, such as those used in deep space exploration. This paper presents the creation of an innovative, entirely bio-based epoxy monomer. Its cyclic rigid dynamic bonds confer a high tensile modulus (4.06 GPa), glass transition temperature (T_g = 240 °C), notable creep resistance with full shape recovery at 180 °C, and remarkable degradability, dissolving entirely in a 1 M HCl solution in just 60 minutes at 50 °C. The preparation of the diacetal was accomplished by reacting vanillin with xylitol under acidic conditions. This was followed by a reaction with bio-derived epichlorohydrin to produce bio-based, multifunctional epoxy monomers featuring hydroxyl groups and bicyclic acetal structures, representing a new strategy for eco-friendly polymer synthesis. This monomer was then cured with a hardener to create an epoxy crosslinked network. The eco-friendly raw materials are easily obtainable, and the synthesized cross-linked network structure is exceptionally high-performing. This makes it a potential material for use in deep space exploration and other tough environments, and it provides a benchmark for synthesizing chemically degradable epoxy resins suitable for extreme conditions.

中文翻译：

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全生物基缩醛二氧基单体，具有高模量、良好的热稳定性和易降解性


可降解环氧树脂旨在解决传统环氧树脂造成的环境污染。然而，在可降解树脂的设计中加入动态共价键的可降解性通常会损害材料的刚度和耐热性，使其不太适合高温应用，例如深空探测中使用的应用。本文介绍了一种创新的、完全生物基的环氧树脂单体的创造。其循环刚性动态键赋予了高拉伸模量 （4.06 GPa）、玻璃化转变温度 （T_g = 240 °C）、显著的抗蠕变性，在 180 °C 时可完全恢复形状，以及出色的可降解性，在 50 °C 下仅需 60 分钟即可完全溶解在 1 M HCl 溶液中。 通过在酸性条件下将香兰素与木糖醇反应来完成二头肌的制备。随后与生物衍生的环氧氯丙烷反应，生产具有羟基和双环缩醛结构的生物基多功能环氧单体，代表了环保聚合物合成的新策略。然后用固化剂固化该单体，形成环氧树脂交联网络。环保的原材料很容易获得，合成的交联网络结构具有极高性能。这使其成为用于深空探测和其他恶劣环境的潜在材料，并为合成适用于极端条件的化学可降解环氧树脂提供了基准。