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Water‐soluble copolymers. VI. Dilute solution viscosity studies of random copolymers of acrylamide with sulfonated comonomers
Author(s) -
Neidlinger Hermann H.,
Chen GowSheng,
McCormick Charles L.
Publication year - 1984
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1984.070290301
Subject(s) - copolymer , viscometer , aqueous solution , intrinsic viscosity , reduced viscosity , viscosity , sodium , ionic strength , polymer chemistry , distilled water , dilution , materials science , hydroxyethyl cellulose , polyelectrolyte , relative viscosity , chemistry , polymer , thermodynamics , organic chemistry , chromatography , composite material , cellulose , physics
Abstract Dilute solution viscosity of a series of random copolymers of acrylamide (AM) with sodium‐2‐acrylamido‐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 [η] 0 and the reciprocal of the square root of ionic strength in sodium chloride solutions, with salt concentrations varying from 0.043 M to 0.257 M . Negative temperature coefficients for [η] 0 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 0.257 M sodium chloride aqueous media is used to elucidate viscosity–structure relationships. 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.