Water‐soluble copolymers. X. Copolymers of acrylamide with N‐(1,1‐dimethyl‐3‐oxybutyl)acrylamide and N,N‐dimethylacrylamide: Solution properties

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Abstract
Dilute solution properties of copolymers of acrylamide (AM) with N‐(1,1‐dimethyl‐3‐oxybutyl)acrylamide (DAAM) and with N,N‐dimethylacrylamide (DMAM) have been studied as a function of composition, temperature, time, and added electrolytes sodium chloride and calcium chloride. Unlike the AM‐DMAM copolymers, the AM‐DAAM copolymers show solution viscosity increases in the presence of added NaCl and CaCl2 and decreases with increasing temperature which are related to copolymer composition. The unusual viscosity behavior of the DAAM‐AM copolymers is suspected to be due to chain extension resulting from intramolecular hydrogen bonding and other cooperative associations along the macromolecular backbone.