不同环氧树脂改性BMI/CE树脂体系的非等温固化行为研究

Curing Kinetics of Studying on Modified Bismaleimide and Cyanate Ester System with Different Epoxy Resins by Non-isothermal Method

采用差示扫描量热仪研究了不同牌号环氧树脂对双马来酰亚胺/氰酸酯(BMI/CE)树脂体系在不同升温速率下的固化反应。在保持BMI和CE质量比为1∶2的前提下,加入同等质量不同牌号环氧树脂,运用Kissinger法、Ozawa法和Crane法求得活化能和反应级数等动力学参数。结果表明,用环氧树脂(AG-80)改性BMI/CE树脂体系的活化能平均值为81.55kJ/mol,反应级数为0.93;环氧树脂(TDE-85)改性的树脂体系的活化能平均值为69.25kJ/mol,反应级数为0.92;环氧树脂(TDE-85)改性BMI/CE树脂体系更有利于固化工艺的实现。

The cure kinetics of epoxy resin （AG--80 and TDE-85） modified bismaleimide/cyanate ester （BMI/CE） system was investigated at different heating rates, using non-isothermal differential scanning calorimetry （DSC）. The curing kinetics parameters of the system were obtained by Kissinger, Ozawa equation, and Crane＇s theory. For epoxy resin（AG-80） modified System, the average activation energy was 81. 55 kJ/mol, and the reaction order was 0. 93. For epoxy resin （TDE-85） modified system, the average activation energy was 69.25 kJ/mol, and the reaction order was 0. 92. Compared to epoxy resin （AG-80） modified system, the results indicated that the addition of epoxy resin （TDE-85） could lower the activation energy of the modified system and the curing reaction could occur at a relative low temperature.