Facile synthesis of water-soluble polymeric benzophenone photoinitiators

Two novel water-soluble polymeric benzophenone photoinitiators were efficiently synthesized at 20℃ by using 2-(Dimethylamino)ethyl methacrylate,4-bromomethyl benzophenone,and 4,4′-di(bromomethyl)benzophenone as reactants,respectively.The yield of 4-[N-(2-methacyloxylethyl)dimethylammonium methyl]benzophenone was 79.2%,and that of 4,4′-bis[N-(2-methacyloxylethyl)dimethylammonium methyl]benzophenone was 79.7%.The products were characterized by IR,NMR and EA.