Iodine Complexes of Acid-Functionalized Poly(vinyl alcohol) Hydrogels: Synthesis, Characterization and Release Studies

By : Nasreen Mazumdar, S. Ishraque Ahmad, Showkat A. Ganie, Akbar Ali

Page No: 41-52

Abstract
Iodine containing polymers were synthesized to study the interaction of iodine with functionalized polymers and the release of various iodine forms from the polymeric materials. Preparation of functionalized hydrogels by crosslinking polyvinyl alcohol (PVA), a synthetic hydroxylated polymer with a dicarboxylic acid is discussed here. Thin films of PVA, cast from aqueous solutions were crosslinked with malonic acid. Concentration of the crosslinker, crosslinking temperature and time were varied to achieve different levels of crosslinking. The films were iodinated with 0.164 mol dm-3 iodine solutions prepared in ethanol and aqueous solution of potassium iodide to study the complexation of molecular and ionic iodine (I2 and I3 - ) with the carbonyl groups introduced in functionalized PVA. The properties of the iodinated hydrogels thus produced were compared and the characteristics of the crosslinked hydrogels were studied by thermal and spectral methods. The complexes were evaluated as iodine release systems and the different forms of released iodine were identified. A reaction scheme has been proposed to suggest the formation of the hydrogel and its iodine complexes.

Authors :
Nasreen Mazumdar, S. Ishraque Ahmad, Showkat A. Ganie and Akbar Ali : Department of Chemistry, Jamia Millia Islamia Central University, New Delhi 110025, India.