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Rate of swelling of sodium polyacrylate
Author(s) -
Ogawa Ikuko,
Yamano Hideki,
Miyagawa Kinjiro
Publication year - 1993
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.1993.070470204
Subject(s) - swelling , sodium polyacrylate , sodium , kinetics , activation energy , reaction rate constant , chemistry , gravimetric analysis , chloride , nuclear chemistry , polymer chemistry , materials science , organic chemistry , composite material , raw material , physics , quantum mechanics
The kinetics of the swelling of sodium polyacrylate (NaPA), a hydrophilic polymer, was studied gravimetrically, by microscopic observation, and calorimetrically. The swelling process followed first‐order kinetics and the rate constant was of the order of 10 −2 s −1 . The gravimetric method, however, was not useful for kinetic studies. The rate constant was depressed by the addition of sodium chloride. The activation energy of the swelling was 46.0 ± 6.2 (kJ mol −1 ) and decreased with the increase in sodium chloride concentration. In acid solution, the activation energy was almost the same as that in water. The heat of the swelling was 196 ± 17 J g −1 and did not vary with the addition of sodium chloride. © 1993 John Wiley & Sons, Inc.