Syndiospecific Coordination Polymerization of Si-H-Containing Styrenes Catalyzed by Scandium Complex and Synthesis of Styrene-Based Triblock Copolymers.

Author(s) Yu, H.; Yang, K.; Niu, H.; Yu, J.; Dong, J.; Wang, J.; Li, Y.
Journal Macromol Rapid Commun
Date Published 2019 Jun
Abstract

The controlled syndiospecific polymerization of three Si-H-containing styrenes, that is, 4-(methylhydrosilyl)styrene (FSt-1), 4-(dimethylhydrosilyl)styrene (FSt-2) and 4-(diisopropylhydrosilyl)styrene (FSt-3), is realized in the presence of (C Me SiMe )Sc (CH C H ) (THF)/[Ph C][B(C F ) ]. Then a series of FSt-b-styrene-b-FSt triblock copolymers (FSt-St-FSt) are synthesized facilely via a sequential monomer feeding process (FSt-2, styrene, and FSt-2, respectively) during the polymerization. The syndiotactic polystyrene (sPS) block in the middle endows the copolymer with high melting point above 250 °C, whereas the Si-H groups on monomer FSt-2 introduce functional pendants to the end-blocks (with Si-H content of 31-63 mol%). Finally by a mild and high-effective hydrosilylation reaction, novel polar-group functionalized sPS is obtained.

DOI 10.1002/marc.201900048
ISSN 1521-3927
Citation Yu H, Yang K, Niu H, Yu J, Dong J, Wang J, et al. Syndiospecific Coordination Polymerization of Si-H-Containing Styrenes Catalyzed by Scandium Complex and Synthesis of Styrene-Based Triblock Copolymers. Macromol Rapid Commun. 2019;40(11):e1900048.