Retardation in RAFT Polymerization: Does Cross-Termination Occur with Short Radicals Only?
Retardation in RAFT Polymerization: Does Cross-Termination Occur with Short Radicals Only?
复制标题
DOI：
10.1021/ma200831f
复制
发表时间：
2011-05
期刊：
影响因子：
5.5
通讯作者：
S. Ting;T. P. Davis;P. Zetterlund
中科院分区：
文献类型：
--
作者：
S. Ting;T. P. Davis;P. Zetterlund
最近提出的模型由Perrier和同事[J]。变异较大。科学。A部分：Polym。二硫苯甲酸盐介导的可逆加成-裂解链转移（RAFT）聚合的阻滞效应已经在实验中进行了测试。根据该模型，阻滞仅由极短自由基的交叉终止引起。采用高分子偶氮引发剂和基于二硫苯甲酰的高分子RAFT试剂进行聚合，从而有效地消除了体系中的所有短自由基。结果表明，在没有短自由基的情况下，二硫苯甲酸酯介导的苯乙烯RAFT聚合几乎没有阻滞，这与模型基本一致。
The recently proposed model by Perrier and co-workers [J. Polym. Sci., Part A: Polym. Chem. 2009, 47, 3455] to account for retardation effects in dithiobenzoate-mediated reversible addition–fragmentation chain transfer (RAFT) polymerization of styrene has been tested experimentally. According to this model, retardation is caused by cross-termination of very short radicals only. Polymerizations were conducted employing a macroazoinitiator and a polymeric RAFT agent based on cumyl dithiobenzoate, thereby effectively eliminating all short radicals from the system. The results show, in basic agreement with the model, that there is very little, if any, retardation in dithiobenzoate-mediated RAFT polymerization of styrene in the absence of short radicals.