Graft copolymerization by iniferter method; structural analyses of graft copolymer by glass transition temperature



Since 4-vinylbenzyl N,N-diethyldithiocarbamate (VBDC) polymer easily cleaves at the C—S bond and generates benzyl radical, graft copolymerization of methyl methacrylate (MMA) or 4-vinylpyridine (VPy) onto VBDC polymer is easily performed by UV irradiation. The structural analyses of the graft copolymers are performed through glass transition temperature measurements. The graft copolymers of MMA have one Tg and VPy graft copolymers have two Tg's arising from the main and side chains. It becomes clear that the mode of side chains propagation is significantly different for each of the second monomers used.