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Syndiospecific Coordination Polymerization of Si‐H‐Containing Styrenes Catalyzed by Scandium Complex and Synthesis of Styrene‐Based Triblock Copolymers
Author(s) -
Yu Hui,
Yang Ke,
Niu Hui,
Yu Jialin,
Dong Jinghan,
Wang Jing,
Li Yang
Publication year - 2019
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201900048
Subject(s) - copolymer , styrene , polymer chemistry , polymerization , polystyrene , monomer , materials science , hydrosilylation , catalysis , chemistry , organic chemistry , polymer
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 5 Me 4 SiMe 3 )Sc (CH 2 C 6 H 5 ) 2 (THF)/[Ph 3 C][B(C 6 F 5 ) 4 ]. 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.