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High molecular weight hydrolyzed polyacrylamides. III. Effect of temperature on chemical stability
Author(s) -
Muller G.,
Fenyo J. C.,
Selegny E.
Publication year - 1980
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.1980.070250409
Subject(s) - hydrolysis , polyacrylamide , chemistry , degradation (telecommunications) , intrinsic viscosity , viscosity , molar mass distribution , potentiometric titration , polymer , polymer chemistry , chemical engineering , chromatography , organic chemistry , materials science , ion , composite material , telecommunications , computer science , engineering
The effect of temperature (100°C) and heating time (up to 384 hr) on the physicochemical properties of high molecular weight ( M̄ p ≅ 4 × 10 6 ) partly hydrolyzed (τ ≅ 31%) polyacrylamide (HPAM‐25) solutions with initial pH values near 4 and 7, respectively, is reported. Potentiometric and spectroscopy data indicate that upon heating the solutions for 16 days the extent of hydrolysis is increased up to around 90%. The viscosity behavior, especially in the presence of bivalent salt (CaCl 2 ), can be explained by taking such an increase in hydrolysis into consideration. From light scattering data, it is shown that the conformational changes are not correlated with molecular weight degradation.