【摘要】 用3-苯基丙酸通过熔融法改性缩水甘油封端双酚A-环氧氯丙烷共聚物,制备了环氧树脂自修复复合材料.研究结果表明:3-苯基丙酸可屏蔽修复剂分子链末端环氧环;修复剂填充量增加,修复效果明显改善,改性修复剂质量分数为10%时,120℃修复6 h的修复效率达34.5%;对于不同修复剂质量分数,修复时间从3 h延长到6 h的修复效率提高均比6 h到9 h的提高明显,修复剂分子链分子运动在6 h左右达到新的平衡;修复温度提高,修复效率明显提高,修复熔融温度120～130℃时,修复剂分子链作整链运动;试样多次修复效率随修复次数增加而降低,不添加修复剂试样的修复效果主要来源于二次固化作用,添加修复剂试样的多次修复效率下降趋势明显降低.更多还原

【Abstract】 Poly(bisphenol A-co-epichlorohydrin) glycidyl end-capped(BPA-co-ECH GEC) was modified by melt reaction with 3-phenylpropionic acid to prepare self-healing epoxy resin composite.The results show that epoxy end groups can be reacted with 3-phenylpropionic acid.The healing efficiency is markedly improved by the increasing of healing agent content.The healing efficiency reaches 34.5% with 10% healing agent at 120 ℃ for 6 h.The enhancement of healing efficiency from 3 h to 6 h is ob-viously more than that from 6 h to 9 h for every sample with different healing agent content.The molecular motion of healing agent molecular chain reaches new equilibrium for the healing time of 6 h.The hea-ling efficiency is increased by increasing healing temperature.The whole healing agent molecular chains motion at healing temperature range of 120 to 130 ℃.Multi-time re-healing efficiency is decreased with the increasing of healing time.The healing effect of samples without healing agent is due to the re-solidification of epoxy resin.The downtrend of multi-time re-healing efficiency is markedly decreased by adding healing agent.更多还原