Dual cooperative organocatalysts for one-pot synthesis of polyester-polythiocarbonate block copolymers from multiple monomers  

作　　者：Cheng-Jian Zhang Xun Zhang Xing-Hong Zhang 

机构地区：[1]Key Laboratory of Macromolecular Synthesis and Functionalization,Ministry of Education,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027,China

出　　处：《Science China Chemistry》2020年第12期1807-1814,共8页中国科学（化学英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(51973190,21774108).

摘　　要：The sequential arrangement of multiple monomer units in a polymer chain remains a major challenge in synthetic chemistry.Here we describe a versatile route to the novel polyester-polythiocarbonate block copolymer from commercially available lactones, epoxides, and carbonyl sulfide(COS). A bicomponent organocatalyst combining triazabicyclodecene(TBD) with triethyl borane(TEB) generates two types of tunable active sites, i.e., TBD-capped alcohol via hydrogen bond and TEB-capped alcohol via O→B coordination bond, which can successively catalyze ring-opening polymerization of lactones and ring-opening copolymerization of COS and epoxides from mixed monomers in one pot. Because of the reversible activated propagating anions and fast activity exchange between the active and dormant species, all of the polymer chains are enchained with both polyester and polythiocarbonate blocks. Kinetic determination quantitatively confirms the proposed mechanism. This method enables diverse lactones and epoxides to form sulfur-containing block copolymers with readily tunable structures.

关 键 词：block copolymer POLYESTER polythiocarbonate ORGANOCATALYSIS polymer synthesis 

分 类 号：TQ317[化学工程—高聚物工业] TQ426