SYNTHESIS OF GRAFT-COPOLYMERS .1. SYNTHESIS OF MACROINITIATORS

Thermal polymeric initiators, having pendant 1,2-bis(trimethylsilyloxy )tetraphenylethane (or benzopinacolate) groups along the chain, have b een prepared. First, the reactivity ratios of 4-vinylbenzophenone (4VB P) and 4-methacryloyloxybenzophenone (MOB) copolymers with styrene or methylmethacrylate were determined. Then the randomly containing 4VBP or MOB copolymers were transformed into polymeric initiators by duplic ation reaction of the attached benzophenone. Polymerization of MMA or St initiated by the resulting copolymers having pendant benzopinacolat e groups was carried out yielding PMMA-g-PS and PS-g-PMMA. (C) 1995 Jo hn Wiley and Sons, Inc.