COPOLYMERIZATION OF N-VINYLSUCCINIMIDE WITH VINYL-ACETATE IN WATER

A study has been made of the copolymerization of N-vinylsuccinimide wi th vinyl acetate in an aqueous medium at 20-40-degrees-C, with an init iator system consisting of ammonium persulfate and sodium sulfite. Fac tors influencing the copolymer yield and composition have been investi gated: monomer mixture composition, ratio of components of the initiat or system, temperature, and sequence of charging the components of the reaction mixture. Calculated data on the microstructure of the copoly mers are compared with results obtained by PMR spectroscopy. It has be en shown by means of turbidimetric titration that there is no homopoly mer of N-vinyl-succinimide in the copolymers. The heat resistance of t he copolymer products increases as their content of N-vinylsuccinimide units increases.