The influence of vinyl acetate grafting reactions or nonionic type emulsifiers on the kinetics and on properties of emulsions has been studied. The emulsifiers used were polyvinyl alcohol and block copolymers ethylene oxide–propylene oxide. Due to the grafting reactions the polymerization rate decreased or increased with the increase in polyvinyl alcohol concentration, depending on the emulsifier/monomer ratio. During polymerization, graft copolymers of the monomer on the emulsifier chain are obtained. These copolymers are either water‐soluble, benzene‐soluble, or insoluble in water and benzene. The number of grafting reactions increases with the rise in initiator concentration. This leads to a decrease of benzene‐soluble fractions and to an increase of the water‐soluble and water‐and‐benzene‐insoluble fractions. The concentration of emulsifier in water‐and‐benzene‐soluble fractions was established by NMR analysis. The IR spectra of products proved the formation of graft copolymers.
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Gavǎt et al. (1978) studied this question.
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