Poly(sulfobetaine)s and corresponding cationic polymers. VIII. Synthesis and aqueous solution properties of a cationic poly(methyl iodide quaternil styrene-N,N-dimethylaminopropyl maleamidic acid) copolymer

A cationic poly(methyl iodide quaternized styrene-N,N-dimethylaminopropylma leamidic acid) copolymer was synthesized through amidoacidification reactio n of styrene-maleic anhydride copolymer with N,N-dimethylaminopropylamine ( ring-opening reaction). Its properties in various aqueous salt solutions an d pH solutions were studied by measurements of reduced viscosity and intrin sic viscosity. The results indicated that the reduced viscosity and intrins ic viscosity of this cationic polyelectrolyte were related to the type and concentration of the added salts and the results also showed a contrary ten dency in some salts with monovalent acid groups to polyelectrolyte. At the same time, some salt ions were observed to strongly attract the quaternary ammonium group of the cationic polymeric side chain and resulted in agglome ration of the polymers. (C) 2001 John Wiley & Sons, Inc. J Appl Polym Sci 8 0: 1619-1626, 2001.