文献类型：期刊文献

英文题名：Photo-controlled RAFT polymerization mediated by organic/inorganic hybrid photoredox catalysts: enhanced catalytic efficiency

作者：Wang, Wulong[1];Zhong, Sheng[1];Wang, Guicheng[1];Cao, Hongliang[1];Gao, Yun[1];Zhang, Weian[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2020

卷号：11

期号：18

起止页码：3188

外文期刊名：POLYMER CHEMISTRY

收录：;EI(收录号：20202408815175);WOS:【SCI-EXPANDED(收录号:WOS:000534359000007)】；

基金：The support from the Natural Science Foundation of Shanghai (18ZR1408300) is acknowledged.

语种：英文

外文关键词：Block copolymers - Excited states - Light - Zinc compounds - Image enhancement - Reaction rates

摘要：Metalloporphyrins (MTPPs) play an important role in the conversion of light energy to initiate photoinduced electron transfer-reversible addition-fragmentation chain transfer (PET-RAFT) polymerization, in which zinc tetraphenylporphyrin (ZnTPP) has attracted a high degree of attention. However, the self-aggregation effect of porphyrins in some organic solvents such as dimethyl sulphoxide (DMSO) leads to quenching of the excited state of the MTPPs and reduces their photocatalytic capacity in a concentration-dependent manner. In this study, a ZnTPP-POSS organic/inorganic complex was fabricated by linking a polyhedral oligomeric silsesquioxane (POSS) to ZnTPP. The aggregation of the photocatalyst was efficiently depressed in a PET-RAFT polymerization which was catalyzed by ZnTPP-POSS under green light (lambda(max) = 515 nm, 3 mW cm(-2)). Compared to ZnTPP, the reactions using ZnTPP-POSS as the photocatalyst were well controlled for different monomers with accelerated reaction rates. Well-defined block copolymers were successfully achieved by the chain-extension reaction which demonstrates the high-end fidelities of this polymerization approach.