The ratios of the logarithmic concentrations of the two comonomers, ft for the radical copolymerizations of styrene with methyl methacrylate, vinyl chloride with vinyl acetate, methyl methacrylate with vinyl acetate, acrylic acid with acrylamide, methacrylic acid with methacrylamide and sodium methacrylate with methacrylamide are found to be independent of the degree of conversion. The monomer reactivivity ratios, r 1 and r 2 for these systems are determined by the relation (Formula present) The values of r 1 and r 2 at zero conversion obtained in this work coincide with the literature values; however, as the degree of conversion increases, significant changes in r\ and r 2 are observed. The onset of deviations of r 1 and r 2 from their initial values depends on the pair of monomers being studied. The monomer reactivity ratios of the first two of the discussed systems both show positive deviations, but the latter four systems give one positive deviation and another negative.
|Number of pages||8|
|Journal||Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an|
|Publication status||Published - 1989 Jan 1|
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