Abstract
AbstractThe graft polymerization of styrene onto preirradiated poly(isobutylene oxide) (PIBO) with methanol and benzene was studied. The order of grafting yield and of the number‐average molecular weight of graft chains decrease in the order; undiluted styrene > styrene–methanol (1:1) solution > styrene–benzene (1:1) solution. A kinetic treatment to calculate rate constants from the rate of grafting and the molecular weight of the graft chain was proposed. The propagation rate constant kp was 0.2–0.3 l./mole‐sec and the termination rate constant kt was 1.0–16.0 l./mole‐sec. The ratio kp/kt in this heterogeneous system was larger than that in homogeneous system by a factor of about 104–105.
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