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Precision Synthesis of Hybrid Block Copolymers by Organotellurium‐Mediated Successive Living Radical and Cationic Polymerizations
Author(s) -
Mishima Eri,
Yamada Takeshi,
Watanabe Hiroshi,
Yamago Shigeru
Publication year - 2011
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201000402
Subject(s) - cationic polymerization , copolymer , living cationic polymerization , block (permutation group theory) , polymer chemistry , living free radical polymerization , chemistry , radical polymerization , organic chemistry , polymer , mathematics , geometry
Living cationic polymerization reactions using organotellurium compounds as initiators are reported. Polymerization of vinyl ethers in the presence of an organotellurium initiator and a Lewis acid, such as In(OTf) 3 and BF 3 ⋅ OEt 2 , affords well‐controlled poly(vinyl ether)s with predetermined molecular weights and narrow molecular‐weight distributions. Poly(meth)acrylates possessing organotellurium group at the ω‐polymer end, which are prepared using organotellurium‐mediated controlled/living radical polymerization (TERP), are used as macroinitiators for living cationic polymerization. The one‐pot, two‐step reaction of the macroinitiator with vinyl ether under radical and cationic conditions gives well‐controlled AB diblock copolymers. ABA triblock copolymers with controlled structures are also synthesized from a bifunctional organotellurium initiator.