基于可逆动态共价化学的新型可修复、可回收、可加工环氧树脂

摘要

Epoxy resins were synthesized through the cure agents of hydrazide and acylhydrazone derived from fatty dimer acid.The curing behavior, structure and properties of the cured epoxy resins were characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, scanning electron microscope, thermogravimetric analysis and dynamic mechanical analysis.The unique properties of the imine dynamic covalent bond of the network material were studied.The modified epoxy resins show improved toughness.Besides, the glass transition temperature (Tg) and thermal stability don''t reduce dramatically compared to traditional epoxy resin.When the cured epoxy resin is treated at elevated temperature or enough pressure, the acid can catalyze dynamic imine exchange reaction and make the material smart response for temperature and pH.%利用生物来源的二聚脂肪酸为原料,合成了二聚酸酰肼和二聚酸酰腙两种衍生物,并进一步以其作为环氧E-44树脂固化剂,得到了新型的含动态共价连接的热固性环氧树脂.采用傅里叶红外光谱(FT-IR)、差式扫描量热(DSC)、扫描电子显微镜(SEM)、热重(TG)和动态力学分析(DMA)等多种测试手段对环氧树脂固化过程以及固化后材料的结构与性能关系进行了详细表征,特别研究了动态亚胺键对热固性环氧树脂性能的独特影响.结果表明:与传统环氧树脂相比,改性后的环氧树脂有更好的韧性,且其玻璃化转变温度及热稳定性没有明显下降.在升温和加压的条件下,酸可催化亚胺键的动态交换反应,赋予传统环氧树脂以全新的可修复、可回收与可多次加工性能.