WATER-SOLUBLE POLYMERS .28. AMPHOLYTIC COPOLYMERS OF SODIUM 2-ACRYLAMIDO-2-METHYLPROPANESULFONATE WITH (2-ACRYLAMIDO-2-METHYLPROPYL)DIMETHYLAMMONIUM CHLORIDE - SYNTHESIS AND CHARACTERIZATION

Copolymers of (2-acrylamido-2-methylpropyl)dimethylammonium chloride (AMPDAC) and 2-acrylamido-2-methylpropanesulfonate (NaAMPS) were prepared by free radical polymerization employing potassium persulfate as the initiator. Copolymer compositions were determined from elemental analysis and **1**3C NMR data. Reactivity ratio studies yielded r//1 and r//2 values of 0. 22 and 0. 31 for the AMPDAC (M//1) and NaAMPS (M//2) monomer pair. Molecular weights, determined by using low-angle laser light scattering, were found to decrease with AMPDAC content and ranged from 1. 6 to 9. 5 multiplied by 10**6 g/mol. Copolymer microstructures were predicted by calculation of reactivity ratios.