双酚A甲醛酚醛环氧树脂与二氨基二苯醚的固化反应及热降解  

Curing Reaction and Thermal Degradation of Bisphenol A Type Novolac Epoxy Resin with 4,4′-Diaminodiphenyl Ether

作　　者：刘彦方[1] 杜中杰[1] 张晨[1] 励杭泉[1] 

机构地区：[1]北京化工大学北京市新型高分子材料制备与加工重点实验室

出　　处：《应用化学》2007年第3期256-260,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金资助项目(50503004)

摘　　要：用傅里叶红外光谱、差示扫描量热仪和热重分析测试技术研究了双酚A甲醛酚醛环氧树脂(bis-ANER)与二氨基二苯醚(DDE)的固化反应及其固化产物的热降解性能。在等温固化反应中环氧基团红外光谱吸收强度随固化时间延长而逐渐减弱,羟基吸收强度逐渐增强,固化反应后期出现羰基红外吸收,其强度随固化时间的延长而增强。用Kissinger法和Ozawa-Flynn-Wall法计算出的bis-ANER/DDE非等温固化反应活化能分别为57.6和61.5kJ/mol。固化产物的热降解首先是醚键的断裂,在N2气和O2气气氛下起始阶段的热降解反应均符合g(α)=[-ln(1-α)]2/3的核增长反应机理,2种气氛下高温阶段的热降解机理不同,O2气在降解过程中产生氧化作用。The curing reaction and thermal degradation of bisphenol A type novolac epoxy resin （bis-ANER） with 4, 4＇-diaminodiphenyl ether （DDE） were investigated with Fourier-transform infrared spectroscopy, differential scanning calorimetery and thermogravimetry. With extending curing time, the intensity of the IR absorbance of epoxide groups decreased, and that of the hydroxyl groups increased. In the later curing stage, the IR absorbance of the carbonyl groups appeared and its intensity increased with curing time. The apparent activation energies of the no-isothermal curing for the bis-ANER/DDE evaluated with the Kissinger and Ozawa- Flynn Wall methods were 57.6 and 61.5 kJ/mol, respectively. In addition, the thermal degradation of the bis-ANER/DDE network began with the breaking of the ether bond, and the reactions in both nitrogen and oxygen atmospheres followed the nucleation and growth mechanism in the initial degradation stage, g （α） = [ -In （1 -α ）] 2/3. In the higher temperature stage, the thermal degradation reaction mechanisms were different in the two atmospheres, and the oxidation effect of oxygen on the thermal degradation reaction appeared.

关 键 词：环氧树脂 固化反应 热降解 动力学 红外光谱法 热分析法 

分 类 号：O631[理学—高分子化学] TQ323.5[理学—化学]