在线红外研究H_(12)MDI与PCDL预聚反应动力学

Study on Prepolymer Reaction Kinetics of H_(12)MDI and PCDL by Online IR Technology

采用ReactTM4000在线红外仪,研究了二环己基甲烷二异氰酸酯(H12MDI)与聚碳酸酯二元醇(PCDL)聚合体系在溶剂N,N-二甲基甲酰胺(DMF)中的聚合反应动力学。结果表明,H12MDI与PCDL在DMF中的预聚反应符合二级反应,无催化剂时反应速率常数k=0.5exp(-15652/RT)(L.mol-1.min-1),在催化剂二月桂酸二丁基锡(T-12)质量分数为0.05%时反应速率常数k=0.285exp(-6481/RT)(L.mol-1.min-1)。

The prepolymer reaction kinetics of H12MDI and PCDL in the solvent DMF was investigated with online IR ReactTM4000 technology.It is found that polyurethane prepolymer reaction between H12MDI and PCDL was the second-order reaction,the reaction rate constant k was 0.5 exp（-15652/RT）（L·mol^-1·min^-1）without catalyst and k was 0.285 exp（-6481/RT）（L·mol^-1·min^-1） in presence of 0.05% T-12 catalyst.