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Indexed by:Journal Papers

Date of Publication:2020-02-21

Journal:POLYMER CHEMISTRY

Included Journals:EI、SCIE

Volume:11

Issue:7

Page Number:1314-1320

ISSN No.:1759-9954

Abstract:The copolymerization of 4-(N,N-diphenylamino)styrene (DPAS) with isoprene (IP) as catalyzed by the half-sandwich scandium compound (C5H5)Sc(CH2C6H4NMe2-o)(2) has afforded a new class of amino-functionalized crystalline styrenic thermoplastic elastomers. The homopolymerization of DPAS bearing a sterically demanding diphenylamino group took place in a quasi-living fashion, yielding the amino-functionalized syndiotactic polystyrene by using this scandium catalyst. In the copolymerization of DPAS with IP, the DPAS units started to become incorporated into the polymer chains after IP was almost completely consumed, yielding the diblock copolymers containing a syndiotactic poly(DPAS) block and a cis-1,4-poly(IP) block with controllable block lengths. Addition of a mixture of DPAS and IP to a completed DPAS polymerization reaction mixture in one pot afforded the DPAS-IP-DPAS triblock copolymers with controllable block lengths. The DPAS-IP-DPAS triblock copolymers showed glass transition temperatures (T-g values of -62 degrees C and 120 degrees C) and a melting point (T-m value of 219 degrees C) originating from the cis-1,4-poly(IP) block and syndiotactic poly(DPAS) blocks, respectively.