Chain-transfer-catalyst: strategy for construction of site-specific functional CO_(2)-based polycarbonates  

作　　者：Enhao Wang Shunjie Liu Han Cao Chunwei Zhuo Xianhong Wang Fosong Wang 

机构地区：[1]Key Laboratory of Polymer Ecomaterials,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China [2]University of Science and Technology of China,Hefei 230026,China

出　　处：《Science China Chemistry》2022年第1期162-169,共8页中国科学（化学英文版）

基　　金：supported by the Fundamental Science Center Project in National Natural Science Foundation of China(51988102);the Key Research Program of Frontier Sciences,Chinese Academy of Sciences(QYZDJ-SSW-JSC017)。

摘　　要：Site-specific functional polymers are generally synthesized from functionalized chain transfer agents(CTA)in the presence of catalysts.However,the poor solubility or chemical inertness of CTAs may make polymerizations uncontrollable.Now,this issue is addressed by proposing a strategy of designing chain-transfer-catalyst(CTC)that combines catalyst and CTA into one.The occurrence of catalytic effect naturally triggers the chain transfer process to give catalyst-labeled polymers with well-defined structures.As a proof-of-concept,cobalt(III)porphyrin catalysts with one,two and four hydroxyl groups act as efficient CTCs,giving the corresponding site-specific functional poly(propylene carbonate)s(PPC),diversifying the topology of polymers.Furthermore,porphyrin-capped PPCs with controllable Mn in the range of 1,000–16,800 g mol^(-1)were obtained by using monofunctional CTC(CTCOH).Moreover,different from traditional“catalyst+CTA”systems,a novel dynamic network transfer mechanism of CTCOH was proposed.This study provides a CTC strategy for the synthesis of site-specific functional polymers.

关 键 词：chain-transfer-catalyst metalloporphyrin complex immortal polymerization CO_(2)copolymerization 

分 类 号：TQ317[化学工程—高聚物工业] TQ426