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Thermal Decomposition Kinetics of an Epoxy Resin with Rubber-Modified Curing Agent

机译:橡胶改性固化剂对环氧树脂的热分解动力学

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摘要

Thermal decomposition kinetics of diglycidyl ether of bisphenol A (DGEBA)/4,4'-methylene dianiline (MDA) system with rubber-modified MDA was studied by the methods of Ozawa,Kissinger,and Friedman,and the kinetic parameters were compared.The thermal decomposition data of the cured epoxy resin were analyzed by thermogravimetric analysis (TGA) at different heating rates.TG curves showed that the thermal decomposition of the epoxy system occurred in one stage regardless of rubber-modified MDA content.The apparent activation energies for the DGEBA/MDA system with 10 phr of rubber-modified MDA,as determined by the Ozawa,Kissinger,and Friedman methods,are 184,182,and 222 kJ/mol,respectively.The thermal stability of the epoxy system increased with the increasing content of rubber-modified MDA,which has four benzene rings with high thermal resistance due to the resonance structure.
机译:采用Ozawa,Kissinger和Friedman方法研究了双酚A(DGEBA)/ 4,4'-亚甲基二苯胺(MDA)与橡胶改性MDA的二缩水甘油醚的热分解动力学,并比较了动力学参数。通过热重分析(TGA)在不同的加热速率下分析了固化的环氧树脂的热分解数据.TG曲线表明,无论橡胶改性的MDA含量如何,环氧树脂体系的热分解都是在一个阶段发生的。用小泽,基辛格和弗里德曼方法测定的具有10 phr橡胶改性MDA的DGEBA / MDA体系分别为184,182和222 kJ / mol。随着橡胶含量的增加,环氧体系的热稳定性也随之提高。改性的MDA,由于共振结构,具有四个具有高耐热性的苯环。

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