Abstract
Free-radical copolymerizations of vinylbenzyl-terminated polystyrene (PS–VM; M 1) and maleate-terminated poly(ethylene glycol methyl ether) PEG–MM; M 2) were carried out in benzene. Mixtures of the PEG–MM and PS–VM showed phase separation during copolymerization. The copolymerization reactivity was estimated from the distribution functions by gel permeation chromatography of the comb-shaped copolymers produced. The reactivity ratios ( r 1=0.765 and r 2=0.064) obtained for the binary macromonomer system were different from corresponding model systems of styrene and maleic acid ethyl ester ( r 1=0.13 and r 2=0.035) due to phase separation.
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