J. Ruiz, A. Mantecon, V. Cádiz
Jul 1, 2001
Citations
1
Influential Citations
58
Citations
Journal
Polymer
Abstract
Abstract Crosslinked poly(vinyl alcohol) with different amounts of ethylenediaminetetraacetic dianhydride was synthesized and characterized by elemental analysis, 13 C-NMR and IR spectroscopy. The average molecular weight between crosslinks ( M c ), the mesh size ( ξ ) and the crosslinking density ( ρ x ) were calculated from swelling studies and related to OH/anhydride ratios. The polymer-solvent interaction parameter ( χ ) was calculated by mechanical measurements. The swelling behaviour of hydrogels was studied as a function of the crosslinking degree. A kinetic study of the absorption determined the transport mechanism. The diffusion coefficient was calculated for the Fickian mechanism, and the swelling behaviours were analyzed in buffer solutions at various pH and temperature ranges. Swelling ratios were relatively high and sensitive to pH and ionic strength, but not to temperature.