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Cooperative diffusion in partially neutralized poly(acrylic acid) gels
Author(s) -
Ilmain F.,
Candau S. J.
Publication year - 1989
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19890300112
Subject(s) - counterion , polymer , diffusion , ionization , scaling , osmotic coefficient , acrylic acid , scaling law , thermodynamics , materials science , polymer network , light scattering , osmotic pressure , polymer chemistry , chemistry , scattering , ion , composite material , activity coefficient , organic chemistry , optics , aqueous solution , physics , biochemistry , geometry , mathematics , monomer
Poly(acrylic acid) networks swollen with water and having different ionization degrees and different polymer concentrations, were investigated using elastic and quasi‐elastic light scattering. The scattered intensity was found to vary as the ratio of the polymer concentration to the ionization degree, which shows that the osmotic pressure is dominated by counterion entropy. The behavior of the cooperative diffusion coefficient cannot be explained by the scaling theories and involves an unexpected variation of the frictional coefficient with polymer concentration.