双酚-S环氧树脂与琥珀酸酐固化反应动力学

Kinetics of Succinic Anhydride Curing of Bisphenol-S Epoxy Resin

用差示扫描量热法 (DSC)研究了双酚 S环氧树脂 (BPSER)与琥珀酸酐固化反应的历程 .实验结果表明 ,固化反应主要分两个阶段 ,前期由化学动力学控制 ,服从自催化机理 .实验数据利用Kamal方程处理得到两个速率常数k1、k2 及两个反应级数m、n .k1、k2 的值随反应温度的升高呈增大的趋势 ,总反应级数m +n在 2～ 2 .5之间 .当转化率达到 40 %左右后 ,由于交联程度增加 ,分子量迅速增长 ,分子间扩散较慢 ,进入反应的第二阶段 。

The kinetics of the cure reaction for a system of bisphenolS epoxy resin (BPSER),with succinic anhydride as a curing agent,was studied by means of differential scanning calorimetry(DSC).Analysis of DSC data indicated that in the first stage of the cure,the controlling reaction is of the autocatalytic nature. By using the model proposed by Kamal,two rate constants,k 1 and k 2,and two reaction orders,m and n were obtained.Rate constants k 1 and k 2 were observed to be greater when curing temperature increased.The overall reaction order,m+n,is in the range 2～2.5.The activation energies for k 1 and k 2 were 96.47 kJ·mol -1 and 79.63 kJ·mol -1 ,respectively.Diffusion control was incorporated to describe the cure in the latter stages.