变温红外光谱法研究GAP与三种异氰酸酯的反应动力学

用变温傅里叶变换红外光谱法研究了二月桂酸二丁基锡(T12)存在下GAP/HMDI、GAP/TDI和GAP/IPDI(此处GAP,HMDI,TDI和IPDI分别为聚叠氮缩水甘油醚,4,4'-二环己基甲烷基二异氰酸酯,甲苯二异氰酸酯和异佛尔酮二异氰酸酯)体系的反应动力学。结果表明,GAP与三种异氰酸酯(HMDI,TDI和IPDI)的反应为二级反应。它们的反应速率均随温度的升高而加快。GAP/HMDI、GAP/TDI和GAP/IPDI体系的反应活化能分别为15.49,12.27和22.46 kJ·mol-1,显示三个体系的反应活性递减次序为GAP/TDIGAP/HMDIGAP/IPDI。

Reaction Kinetics of GAP and Three Kinds of Isocyanates with Variable Temperature FTIR Spectrum Method

The reaction kinetics of the GAP/HMDI, GAP/TDI and GAP/IPDI (where GAP, HMDI, TDI and IPDI are glycidyl azide polymer, hexamethylene diisocyanate, toluene diisocynate and isophorone diisocyanate)systems in the presence of dibutyltin dilaurates (T12)was studied by variable temperature FTIR spectrum method. Results show that the reactions of GAP and three kinds of isocyanates (HMDI, TDI and IPDI) are of the second order. Their reaction rates rise with increasing the reaction temperature. The values of activation energy for reactions of the GAP/HMDI, GAP/TDI and GAP/IPDI systems are 15.49, 12.27, 22.46 J·mol^-1, respectively, revealing that the reaction activity of three systems decreases in the order of GAP-TDI>GAP-HMDI>GAP-IPDI.