Synthesis of star-shaped poly(vinyl ether)s by living cationic polymerization: Pathway for formation of star-shaped polymers via polymer linking reactions |
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Authors: | Shokyoku Kanaoka Nobuhiro Hayase Toshinobu Higashimura |
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Affiliation: | (1) Department of Materials Science, School of Engineering, The University of Shiga Prefecture, 2500 Hassaka, Hikone 522-8533, Japan, JP |
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Abstract: | Summary:
Star-shaped polymers of isobutyl vinyl ether (IBVE) with a microgel core of an aliphatic divinyl ether (2) were synthesized in high yield on the basis of the living cationic polymerization with the HCl/ZnCl2 initiating system. GPC analysis demonstrated that linear coupling products ("two-armed" polymers) and three-armed star polymers
formed during the early stages of the linking reaction, and that subsequent coupling reactions between such low molecular
weight star polymers gave star-shaped polymers with more arms. The number of arms ranged from 5 to 22, which increased with
increasing 2]0/P*] ratio and/or shortening the arm chain.
Received: 11 April 2000/Accepted: 24 April 2000 |
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