No abstract

Dilute solution properties of copolymers of acrylamide (AM) with sodium‐3‐acrylamido‐3‐methylbutanoate (NaAMB) of known molecular weight have been studied as a function of composition, temperature, time, pH, and added electrolytes. Phase separation and potentiometric studies have also been performed. The AM–NaAMB copolymers exhibit high solution viscosities, good salt tolerance, and moderate viscosity‐temperature coefficients. In addition, these copolymers exhibit no phase separation in the presence of divalent cations as is common with many such carboxylated polyelectrolytes. These properties are due to favorable conformations in solution resulting from microstructure and hydrogen bonding effects.

No abstract

No abstract

Dilute solution properties of copolymers of acrylamide (AM) with sodium 3-methacrylamido-3-methylbutanoate (NaMAMB) of known molecular weight have been studied as a function of composition, temperature, time, pH, and added electrolytes. Microstructural analyses have been performed with 13C NMR and statistical methods. Potentiometric and turbidimetric properties have been studied and correlated with the structural data. The copolymers exhibit moderate solution viscosities and viscosity-temperature coefficients in water. The AM-NaMAMB copolymers exhibit large reductions in viscosity as a function of increasing ionic strength; furthermore, no phase separation in the presence of divalent ions is observed up to 100 "C. These properties can be related to polymer microstructure, which allows favorable hydrogen bonding and charge-charge interactions to occur along the macromolecular backbone.