高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (5): 799.

• 论文 • 上一篇    下一篇

MDI与TDI封端聚酯预聚物和扩链剂间反应速率的研究

罗筱烈, 刘瑾, 胡克良, 马德柱   

  1. 中国科学技术大学材料科学与工程系, 中国科学院结构分析开放实验室, 合肥, 230026
  • 收稿日期:1994-09-14 修回日期:1995-01-23 出版日期:1995-05-24 发布日期:1995-05-24
  • 通讯作者: 罗筱烈,女,56岁,副教授.
  • 作者简介:罗筱烈,女,56岁,副教授.
  • 基金资助:

    国家自然科学基金

The Study on the Chain Extension Reaction of MDI and TDIT erminated Polyester Prepolymers with Extenders

LUO Xiao-Lie, LIU Jin, HU Ke-Liang, MA De-Zhu   

  1. Department of Materials Science and Engineering. Academia Sinica Structure Research Laboratory, University of Science and Technology of China, Hefei, 230026
  • Received:1994-09-14 Revised:1995-01-23 Online:1995-05-24 Published:1995-05-24

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。

关键词: 硬段结构, 聚酯型聚氨酯, 扩链反应, 速率常数, 活化能

Abstract: The effects of the hard segment structure on the chain extension reaction kinetics of MDIor TDIterminated 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 NCOterminated 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 NCOter minated PEPA-prepolymer with MOCA is much lower than that with TMP.Such chain ex tension reaetion difference has been discussed.

Key words: Hard segment structure, Polyester-polyurethane, Chain extension reaction, Rate constant, Activation energy

中图分类号: 

TrendMD: