Abstract
A procedure for converting adjacent acrylamide units in polymers to acrylimide units, with minimal interference from hydrolysis reactions was developed and used to characterize monomer unit sequence distributions in styrene-acrylamide copolymers that were prepared in a variety of solvents. It was found that copolymers having the same composition could be cyclized to the same extent irrespective of the solvent used for their preparation. This result indicates that styrene-acrylamide copolymers having a given composition have the same structure, even though formed under conditions that are characterized by considerably different monomer reactivity ratios. It is believed that these different reactivity ratios are artifacts that result from a neglect of partitioning of monomers between free solvent and the domains of growing polymer radicals during copolymerization reactions. ▪
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