Abstract
Copolymers of cationic trimethyl(4-methacrylamidophenyl)ammonium methyl sulfate (TMMAPhAMS) or zwitterionic 3-dimethyl(4-methacrylamidophenyl)ammonato propane sulfonate (DMMAPhAPS) monomer with methacrylamide (MAA) have been prepared by free radical polymerization using 4,4′-azobis-cyanovaleric acid as an initiator in aqueous solution. Copolymer compositions were obtained by elemental analysis. The monomer reactivity ratios were calculated by the Fineman–Ross and Kelen–Tüdos methods. The r1r2=0.17 for TMMAPhAMS/MAA copolymer and r1r2=0.34 for DMMAPhAPS/MAA copolymer, using the Fineman–Ross treatment, exhibit a slight tendency toward alternation. The microstructure of the cationic copolymer series (TMMAPhAMS/MAA) is more alternating than that of the zwitterionic series (DMMAPhAPS/MAA). A similar phenomenon was observed using the Kelen–Tüdos treatment. The statistical distribution of monomer sequences was calculated by the Pyun method. From the microstructure data, the alternation and the blockiness amounts were determined. The dilute-solution properties of the two copolymer series have been studied in related to their composition and added electrolytes.
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