BDC作为Iniferter引发苯乙烯聚合的研究

A Study on Living Radical Polymerization by Using BDC as Photoiniferter

本文研究了由BDC(N,N-二乙基二硫代氨基甲酸苄酯)作为Iniferter(引发-转移-终止剂)引发苯乙烯的光聚合反应。发现转化率和分子量均随时间逐步增大,反应生成带有起始功能端基的聚合物。从顺磁谱可见BDC在光照射下分解生成的小分子自由基[·SSCN-(C_2H_5)_2]及较活泼的苄基自由基引发苯乙烯聚合产生的大分子增长自由基。探讨了这种活性自由基聚合反应机理。

The polymerization of St by using BDG as photoiniferter was studied. In the photopolymerization, both the yields and average-molecular weights of polymers were found to increase with the reaction time. The polymers with functional end groups were obtained. In the 'polymerization process, the stable small radical which was produced by photolysis of BDC or functional end groups and the propagating radical of St were determined by ESR. This living radical photopolymerization mechanism was explained.