Abstract
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/ZnCl 2 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.
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