Copolymers of acrylamide (AM, M 1) with sodium 3-acrylamido-3-methylbutanoate (NaAMB, M 2) synthesized in 1 M NaCl (the ABAM2 series) are compared to those synthesized in deionized water (the ABAM1 series). At fixed feed ratios, higher incorporation rates were found for NaAMB with increasing ionic strength of the polymerization solvent. Reactivity ratios calculated by the methods of Kelen-Tüdös changed from r 1 = 1.23 and r 2 = 0.50 in deionized water to r 1 = 1.00 and r 2 = 0.64 in 1 M NaCl. This change is in accord with a decrease in electrostatic repulsion between the macroradical and unreacted NaAMB. Dilute solution properties, examined as a function of composition and added electrolytes, indicate differences in microstructure for the ABAM1 and ABAM2 copolymers.
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McCormick et al. (1992) studied this question.
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