Water Soluble Copolymers .44. Ampholytic Terpolymers of Acrylamide with Sodium 2-Acrylamido-2-Methylpropanesulfonate and 2-Acrylamido-2-Methylpropanetrimethylammonium Chloride
Polymers and High Performance Materials
Low charge density ampholytic terpolymers of acrylamide with random distributions of sodium 2-acrylamido-2-methylpropanesulphonate and 2-acrylamido-2-methylpropanetrimethylammonium chloride have been synthesized by free radical polymerization in 0.5 M NaCl aqueous solutions. Terpolymer compositions were obtained by C-13 n.m.r. Low angle laser light scattering provided molecular weights and second virial coefficients which varied from 2.78 x 10(6) to 6.77 x 10(6) g Mol-1 and 1.31 to 2.95 ml mol g-2, respectively. Dilute solution properties of the terpolymers were measured with respect to composition, concentration and added electrolytes. Polyampholyte behaviour was observed for the polymer with as little as 0.5 mol% of each charged group and became significant when 7 mol% of each charged monomer was incorporated. At 12 and 15 mol% incorporation of each charged monomer, solution behaviour becomes complex consistent with the existence of intermolecular interactions at low ionic strengths and intramolecular associations at medium salt concentrations.
McCormick, C. L.,
Salazar, L. C.
(1992). Water Soluble Copolymers .44. Ampholytic Terpolymers of Acrylamide with Sodium 2-Acrylamido-2-Methylpropanesulfonate and 2-Acrylamido-2-Methylpropanetrimethylammonium Chloride. Polymer, 33(20), 4384-4387.
Available at: http://aquila.usm.edu/fac_pubs/6891