基于动态酯交换键的可回收形状记忆乙内酰脲环氧树脂,Polymer Engineering and Science

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基于动态酯交换键的可回收形状记忆乙内酰脲环氧树脂
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2023-11-21 , DOI: 10.1002/pen.26562
Wenjing Xing ₁ , Ling Li ₁ , Yao Wang ₁ , Jiajia Guo ₁ , Wei Cao ₁ , Shiyu Lei ₁ , Xiangyu Liu ₁

Affiliation

永久交联网络赋予交联弹性体化学和机械稳定性，使其回收成为严重的环境问题。乙内酰脲环氧树脂结构中五芳基二氮嗪的分解产物是氮气和二氧化碳，是一种环保树脂材料。在此，我们展示了乙内酰脲环氧树脂与酸酐形成的酯键之间由Zn ²⁺催化的可逆共价键合反应，构建了环保型酸酐/乙内酰脲环氧树脂材料的可逆交联网络结构。通过优化其配比，固化物的强度、硬度、韧性均得到大幅提高。酯交换键可以随温度而可逆，这使得合成的固化材料具有形状记忆能力。 HMY1的固化产物用乙二醇回收并在180℃下11小时完全溶解。乙二醇在190℃挥发，得到分解环氧低聚物(DEO)，将其添加到HMY1树脂体系中(DEO量为树脂总质量的30wt%)，网络结构呈交错状。链接起来，使其能够被回收和再制造。因此，这项工作为可回收、可重构和热适应性形状记忆乙内酰脲环氧材料的环保开发提供了新途径。

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Recyclable and shape-memory hydantoin epoxy resins based on dynamic ester-exchanged bonds

The permanent crosslinked network imparts chemical and mechanical stability to crosslinked elastomers, making their recycling a serious environmental issue. The decomposition products of pentaaryl diazoxide in the structure of hydantoin epoxy resin are nitrogen and carbon dioxide, and it is an environmentally friendly resin material. Here, we demonstrate a reversible covalent bonding reaction catalyzed by Zn²⁺ between the ester bond formed by the hydantoin epoxy resin and the acid anhydride, and construct a reversible crosslinked network structure of the environmentally friendly acid anhydride/hydantoin epoxy resin material. The strength, hardness and toughness of the cured material are greatly improved by optimizing its ratio. The ester exchange bonding can be reversible with temperature, which leads to the shape memory capability of the synthesized cured material. The cured product of HMY1 was recovered with ethylene glycol and completely dissolved at 180°C for 11 h. Ethylene glycol was volatilized at 190°C to obtain decomposed epoxy oligomer (DEO), which was added to the HMY1 resin system (the amount of DEO was 30 wt% of the total mass of the resin), and the network structure was cross-linked to enable it to be recovered and remanufactured. Thus, this work provides a new avenue for the environmentally friendly development of recyclable, reconfigurable, and thermally adaptable shape-memory hydantoin epoxy materials.

更新日期：2023-11-21

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