基于点击化学制备高强韧可再加工环氧弹性体

Preparation of Reworkable Epoxy Elastomer with High Strength and Toughness Based on Click Chemistry

首先通过乙二醇二缩水甘油醚和色胺开环聚合反应生成线型吲哚基环氧聚合物,然后将自制的双官能团三唑啉二酮加入到合成的吲哚基环氧聚合体系,通过三唑啉二酮-吲哚点击加成反应合成部分交联的吲哚基环氧聚合物。采用核磁共振氢谱、红外光谱、热重分析、差示扫描量热分析及拉伸试验等测试手段对材料的物化性能、机械性能、再加工性及形状记忆功能等进行分析表征。结果表明:当三唑啉二酮的摩尔含量为色胺的1/8时,吲哚基环氧弹性体聚合物的力学性能最优,其拉伸强度为7.42 MPa,断裂伸长率为154%,断裂能为5.97 MJ·m^(-3),与线型吲哚基环氧聚合物相比,分别增加了4.08,0.14和5.03倍。此外,所得到的吲哚基环氧聚合物弹性体材料在120℃下可实现再加工,并且在一定热刺激条件下具有形状记忆效应。

After the ring-opening polymerization of ethylene glycol diglycidyl ether and tryptamine was used to synthesize linear indole-based epoxy polymers,the self-made bifunctional triazolindione was added into as-prepared indole-based epoxy polymers with different crosslinking densities.The proton nuclear magnetic resonance spectroscopy,infrared spectroscopy,thermogravimetric analysis,differential scanning calorimetry and mechanical properties tests were employed to analyze the physical and chemical properties,mechanical properties,reworkability and shape memory functions of targeted samples.The results show that when the molar ratio of triazolindione and tryptamine is 1/8,the mechanical properties of indole-based epoxy elastomer polymer are the most outstanding with a tensile strength of 7.42 MPa,a break elongation of 154%,a fracture energy of 5.97 MJ·m^(-3),the values of which are 4.08,0.14 and 5.03 folds,respectively,higher than those of linear indole-based epoxy polymers.In addition,the obtained indole-based epoxy polymer elastomer material can be reprocessed at 120℃,implying a shape memory function under thermal stimulation conditions.