摘要
用FTIR法系统地研究了不同硬段结构对聚酯型聚氨酯扩链反应动力学的影响,结果显示:不同类型的二异氰酸酯MDI和TDI形成的NCO封端的聚酯预聚体与二元胺(MOCA)和三元醇(TMP)的扩链反应均为二级反应,由MDI形成的NCO封端的聚酯预聚体与胺或醇的扩链反应速度比TDI类的要快,MOCA扩链比TMP扩链反应活化能低。从基团反应活性对不同体系扩链反应速度的差别进行了讨论.
The effects of the hard segment structure on the chain extension reaction kinetics of MDI or TDI terminated PEPA-prepolymer with diamine(MOCA) and polyol(TMP) have been studied by FTIR method systematically. The reaction rate constants and activation en ergy for these systems have been measured. The chain extension reactions in these systems are found to be reactions of second order. The chain extension reaction of NCO terminated PEPA-MDI-prepolymer with MOCA or TMP is faster than that of PEPA-TDI-prepolymer with the same extenders. The activation energy of the chain extension reaction of NCO ter minated PEPA-prepolymer with MOCA is much lower than that with TMP.Such chain ex tension reaetion difference has been discussed.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1995年第5期799-803,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
聚氨酯
扩链反应
速率常数
活化能
FTIR
Hard segment structure, Polyester-polyurethane, Chain extension reaction,Rate constant, Activation energy