Abstract
A procedure for preparing homogeneous chitosan gels by in situ molybdate
cross-linking is described. The gels are obtained by dispersing solid
MoO3 in a buffered chitosan solution and the polymer is cross-linked
by formation of heavily negatively charged molybdate polyoxyanions.
The resulting ionic gels are very transparent, thermoirreversible
and can be made at low polymer concentrations. Depending on the ionic
strength, these gels are able to swell several times their original
size in aqueous solutions. Estimates of the degree of cross-linking
reveal a very open pore structure which is confirmed by electron
micrographs of the gel.
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