Water-soluble copolymers. VI. Dilute solution viscosity studies of random copolymers of acrylamide with sulfonated comonomers

✍ Scribed by Hermann H. Neidlinger; Gow-Sheng Chen; Charles L. McCormick

• Publisher: John Wiley and Sons
• Year: 1984
• Tongue: English
• Weight: 749 KB
• Volume: 29
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1984.070290301

✦ Synopsis

Dilute solution viscosity of a series of random copolymers of acrylamide (AM) with sodium-2acrylamido-2-methylpropane sulfonate (NaAMPS) and with sodium-2-sulfoethylmethacrylate (NaSEM) has been studied using a four-bulb shear dilution capillary viscometer. The hydrodynamic volume of the copolymers in aqueous media was determined as a function of salt concentration, temperature, shear rate, and time. A linear relationship was observed between the intrinsic viscosity [9]0 and the reciprocal of the square root of ionic strength in sodium chloride solutions, with salt concentrations varying from 0.043M to 0.257M. Negative temperature coefficients for [9]o indicate a decrease in the hydrodynamic volume of the ionic polymer molecules with increasing temperature. The relative zero-shear-intrinsic-viscosity change in distilled water to 0.257M sodium chloride aqueous media is used to elucidate viscosity-structure relatbnships. A maximum value is reached for this parameter at a composition of about 30 mol % of ionic comonomers for AM-NaAMPS and AM-NaSEM copolymer series.