环氧树脂/活化纳米氧化铝复合材料的固化动力学

采用氢氧化钠溶液将纳米氧化铝表面活化,利用Y-缩水甘油醚氧丙基三甲氧基硅烷(KH560)和环氧树脂对活化纳米氧化铝进行表面处理而引入环氧基团.采用差示扫描量热法(DSC)研究复合材料的非等温固化行为,分析了活化纳米氧化铝及其环氧功能化产物对环氧树脂固化动力学参数与机理的影响,运用等转化率方法包括Friedman方法与K...

Curing kinetics of epoxy/activated nano-Al2O3composites

Nano aluminum was subjected to surface activation using sodium hydroxide(NaOH)solution.In order to introduce epoxy group onto the surface of nano aluminum, γ glycidoxypropy1 trimethoxysilane(KH560)and EP resin were used for surface treatment after the activation process.The effect of activated nano aluminum and epoxy functionalized nano aluminum on the mechanism and kinetic parameters of curing reaction of epoxy resin were studied by means of nonisothermal differential scanning calorimetry(DSC).The relationship between activation energy and conversion of the curing reaction was determined by using the isoconversional methods of Friedman and KAS, and the kinetics parameters were also obtained by using Kissinger equation.The results showed that the existence of activated nano aluminum and epoxy functionalized nano aluminum increased the rate constant and decreased gelling temperature.The addition of activated nano aluminum and epoxy functionalized nano aluminum increased activation energy and dealing temperature.When 2% KH560 modified nano aluminum was used, gelling temperature decreased 6.5℃, and dealing temperature increased 17.5℃, but has no obvious effect on the order of reaction and did not change the overall curing reaction mechanism.