一种液晶环氧树脂固化动力学FTIR研究

Curing Kinetics of a Lqiuid Crystalline Epoxy Resin by FT-IR

应用示差扫描量热分析研究了含液晶基元的环氧化合物４ ，４′－ 二（２ ，３ － 环氧丙氧基） 偶氮苯与五种芳香胺类固化剂的固化行为，选择了４ ，４′－ 二氨基二苯甲烷为固化剂。确定了具体的固化条件并合成了液晶环氧树脂。根据环氧树脂自催化固化反应模型和氨基氢等活性假设，利用傅立叶变换红外光谱法研究了４ ，４′－ 二（２ ，３ － 环氧丙氧基） 偶氮苯／４ ，４′－ 二氨基二苯甲烷环氧树脂在１００ ℃、１２０ ℃和１５５ ℃恒温固化时的动力学行为，得到了化学反应控制阶段反应速率及反应速率常数与反应程度之间的关系，最终得到了固化反应的活化能。受反应生成的羟基催化的固化反应的活化能大于受反应体系初始催化剂催化的固化反应的活化能。

The curing processes of 4,4'-diglycidyl ether of azobisphenol (DGEAP ) with five different amine curing agents were studied by means of the DSC. A suitable curing agent,4,4'-diaminodiphenyl methane(DDM) ,and the optimum curing conditions were selected as well. The isothermal curing processes of DGEAP/DDM system at 100 ℃,130 ℃ and 155 ℃ were monitored by Fourier Transform lnfra-Red Spectrum (FTIR). The original kinetic data were obtained by calculating the variety of the peak area of epoxy group via the reaction time. Based on the self-catalyzed curing model of epoxy resin and the original data treated, the reaction rate constants and the activation energy of curing processes catalyzed by different catalysts were obtained. The activation energy of the reaction catalyzed by the pendant hydroxyl groups on the backbone of the reaction products is larger than that of the reaction catalyzed by the initial catalyst.