由4-氰基苄溴引发的苯乙烯电子活化再生原子转移自由基聚合

以4-氰基苄溴(CBB)为引发剂、Fe Cl3·6H2O/PPh3络合体系为催化剂、VC为还原剂实现了对苯乙烯(St)的电子活化再生原子转移自由基聚合(AGET ATRP)。研究表明,聚合过程中单体转化随反应时间增加而线性增长、数均分子量随单体转化率提高而线性增长、得到的聚合物分子量分布指数(PDI)在1.07~1.31之间。为进一步研究取代基团对聚合的影响,选用了4-甲基苄溴(MBB)为引发剂作了对比研究,所得聚合物的结构用核磁氢谱进行了验证。

AGET ATRP of Styrene Using 4-Cyanobenzyl Bromide as the Initiator

4-Cyanobenzyl bromide was used as the initiator for the atom transfer radical polymerization using activators generated by electron transfer(AGET ATRP)of styrene in a FeCl3·6H2O/PPh3/VC catalytic system. Factors that can affect the AGET ATRP system, such as the reaction temperature and amount of initiator, were discussed. The rates of polymerization exhibited first-order kinetics with respect to the monomer. A linear increase in the number-average molecular weight with increased monomer conversion was observed in the initiation systems. The polydispersity indices of the polymer were relatively low(1. 07~1. 31). To study further the effect of the substituent group of the initiator on polymerization, 4-methylbenzyl bromide was also used as an initiator for the polymerization system. The structures of the polymers were characterized by proton nuclear magnetic resonance spectroscopy.