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利用DSC法研究了双环笼状取代倍半硅氧烷/环氧树脂的固化过程,根据Kissinger’s方程计算出固化反应表观活化能和表观指前因子分别为52.6kJ.mol-1和1.44×103min-1。利用热重分析和氧指数法研究了材料的热稳定和阻燃性能,磷硅两元素的协同阻燃效应及笼状骨架的共同作用提高了材料的热稳定性和阻燃性,在700℃时成炭量高达24.5%,氧指数为25。通过动态热机械分析仪表征了材料的玻璃化温度和储能模量。双环笼状取代倍半硅氧烷固化环氧树脂具有较好的低温韧性,在14℃时冲击韧度为3.63kJ.m-2,洛氏硬度为76。结果表明双环笼状取代倍半硅氧烷是一种兼具增韧和阻燃性能的多功能环氧树脂固化剂。
The curing process of the bicyclic cage-substituted silsesquioxane / epoxy resin was studied by DSC. According to Kissinger’s equation, the apparent activation energy and apparent pre-exponential factor of curing reaction were 52.6kJ · mol-1 and 1.44 × 103min-1. Thermogravimetric analysis and oxygen index method were used to study the thermal stability and flame retardancy of the material. The synergistic flame retardant effect of the two elements of phosphorus and silicon and cage-like framework to improve the thermal stability and flame retardancy of the material at 700 ℃ Into carbon up to 24.5% when the oxygen index of 25. The glass transition temperature and storage modulus of the material were characterized by a dynamic thermomechanical analyzer. Bicyclic cage-substituted silsesquioxane cured epoxy resin has good low temperature toughness, impact toughness at 14 ℃ 3.63kJ.m-2, Rockwell hardness of 76. The results show that the bicyclic cage-substituted silsesquioxane is a multifunctional epoxy resin curing agent that combines both toughening and flame retardancy.