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Ion‐exchange induced change in the structure and osmotic properties of sodium polyacrylate hydrogels
Author(s) -
Horkay Ferenc,
Basser Peter J.,
Hecht AnneMarie,
Geissler Erik
Publication year - 2001
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200106)171:1<201::aid-masy201>3.0.co;2-p
Subject(s) - sodium polyacrylate , divalent , swelling , chemistry , salt (chemistry) , sodium , neutron scattering , self healing hydrogels , small angle neutron scattering , ion , ion exchange , dynamic light scattering , inorganic chemistry , polymer chemistry , materials science , scattering , organic chemistry , optics , nanotechnology , composite material , raw material , physics , nanoparticle
The swelling and volume transition of fully neutralized sodium polyacrylate gels were investigated in salt solutions using osmotic and small angle neutron scattering measurements. The volume transition was induced by monovalent/divalent cation exchange. The overall salt concentration and the ratio of monovalent to divalent cations were varied in the biologically significant range. The neutron scattering response of fully neutralized polyacrylate gels in the presence of excess salt is described by the sum of a dynamic and a static component. The thermal correlation length determined from the intensity of the dynamic component displays a maximum at the transition.