生物基胺固化的可降解、可重加工环氧树脂

Synthesis of degradable bio-based amine cured epoxy vitrimer

摘要:

对基于香草醛的可降解缩水甘油醚 (DEPVD)胺解得到生物基可降解胺(DAPVD)，再与樟脑酸缩水甘油酯(DGECA)固化得到环氧树脂。采用红外光谱(FTIR)对DAPVD的结构进行了表征，并制备了树脂样条及碳纤维复合材料，通过动态机械分析(DMA)、拉伸测试、应力松弛测试、降解实验、热重分析(TGA)等手段对环氧树脂的性能进行了表征，并使用拉曼光谱验证了碳纤维的回收效果。结果表明：固化剂中含有的螺环缩醛结构赋予了环氧树脂可降解的特性，而固化反应中原位形成的β羟基叔胺结构在加工温度下可以参与动态酯交换反应，赋予了环氧树脂自修复和可重加工的功能。此外，基于环氧树脂良好的降解性能，制得的碳纤维复合材料在经过0.1M H+酸性溶液中50℃/48h处理后，高价值的碳纤维可以完全回收。

Abstract:

The bio-based amine (DAPVD) was prepared from the amination of the diglycidyl ether (DEPVD), and cured with camphoric acid-based diglycidyl ester (DGECA) to prepare epoxy resin. The chemical structure was confirmed by the FT-IR spectrum, and the resin samples and carbon fiber reinforced polymers (CFRPs) were prepared for tests. The properties of DGECA-DAPVD were characterized by DMA, the tensile test, the stress relaxation test and TGA, and the recycle of carbon fiber was confirmed by the Raman spectra of virgin fiber and recycle fiber. The result indicated that the spior diacetal made the crossed-linked network degradable and tertiary amines-catalyzed transesterification reactions endowed DGECA-DAPVD with repairing and remolding functions. In addition, CFRPs based on DGECA-DAPVD resin can degrade rapidly in 0.1 M H+ acid solution at 50℃/48h and promoted the recycle of carbon fiber, derived from the excellent degradation property of epoxy resins.