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Stability of aqueous solutions of poly[(maleic acid)‐ alt ‐styrene] sodium salts in the presence of divalent cations
Author(s) -
Jarm V.,
SertiĆ S.,
Ŝegudović N.
Publication year - 1995
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.1995.070581107
Subject(s) - aqueous solution , divalent , polyelectrolyte , maleic acid , chemistry , sodium , styrene , salt (chemistry) , copolymer , inorganic chemistry , precipitation , polymer chemistry , nuclear chemistry , organic chemistry , polymer , physics , meteorology
The influence of divalent salts (MgCl 2 , CaCl 2 , BaCl 2 ) on precipitation of polyelectrolyte, poly[(maleic acid)‐ alt ‐styrene]sodium salts, NaMA/St, having two degrees of neutralization (100 mass %, 100NaMA/St and 50 mass % 50NaMA/St) from their aqueous solutions, has been investigated. The experiments were performed by variation of the copolymer concentration, c p = 0.005‐0.04 M /L, salt concentration, c s = 0.002‐0.4 M /L, and temperature, T 298‐333 K. The critical concentrations of salts, c sc , used as a measure of solution stability, were determined from turbidimetric measurements, while viscosity and refractive index measurements were used to indicate the changes in dimensions and hydration of polyions, respectively. © 1995 John Wiley & Sons, Inc.