Abstract
AbstractThe rheological behavior of aqueous solutions of ten acrylic acid and acrylamide copolymers was studied. The mole fraction of acrylic acid in the copolymer ranged from 0.042 to 0.443. Fifteen aqueous solutions for each copolymer were prepared by including all combinations for five values of the degree of neutralization and for three solution concentrations. All other parameters being constant, solution viscosity increases with the degree of neutralization of carboxylic groups in a copolymer. We introduced the expression (ηn –/(η0n), where ηn and η0 are the viscosities of solution at the degree of neutralization n and 0, respectively, and called it the neutralization viscosity number. It has been found that the limiting neutralization viscosity number for n = 0 is a linear function of the acrylic acid mole fraction in the copolymer with acrylamide and that it is independent of the copolymer molecular weight and solution concentration.
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