English Abstract
Novel Thermoplastic Elastomers and Block Copolymers by Living Cationic Polymerization
Mitsuo Sawamoto
Department of Polymer Chemistry,Graduate School of Engineering,Kyoto University Kyoto,Japan
Masami Kamigaito
Department of Applied Chemistry,Graduate,School of Engineering,Nagoya University Nagoya,Japan
Tsuyoshi Ando
Department of Polymer Chemistry,Graduate School of Engineering,Kyoto University Kyoto,Japan
Nippon Gomu Kyokaishi,(2003),76(
8), 285-288 General Review in Japanese.

Abstract
This article presents a concise account for the synthesis of block copolymers by living cationic polymerization that are potential thermoplastic elastomers.Typical examples include ABA-block polymers of isobutylene or vinyl ethers (as B) for soft/mid segments and styrene derivatives(as A)for hard/end segments.The synthetic methodologies include consecutive cationic polymerization with bifunctional initiators and combinations of living cationic and metal-catalyzed living radical polymerizations. Brief discussion is also given for their elastic and mechanical properties.

Keywords:
Living polymerization,Cationic polymerization,Radical polymerization, Isobutene,Vinyl Ether
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