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PREPARATION AND CHARACTERIZATION OF CHITOSAN- ACRYLAMIDE BASED SUPERPOROUS HYDROGELS. Shikha Bhalla, Manju Nagpal, Sandeep Arora

PREPARATION AND CHARACTERIZATION OF CHITOSAN- ACRYLAMIDE BASED SUPERPOROUS HYDROGELS.

Shikha Bhalla, Manju Nagpal, Sandeep Arora

International Journal of Natural Product Science 2012: Spl Issue 1: 2.

Abstract (RBIP-02)

The aim of this study was the preparation and evaluation of different generations of Superporous hydrogels of acrylamide and chitosan using gas blowing technique and evaluate them on the basis of Swelling Studies, Porosity, Density, Void Fraction, Mechanical properties and SEM analysis. The ingredients used in the synthesis were acrylamide, crosslinker (Bis), foam stabilizer (Pluronic F127), initiator pair (APS- TEMED) and foaming agent (NaHCO3). Chitosan was used as second polymer in acrylamide monomer reaction mixture to synthesize second generation superporous hydrogel composites (SPHC) and Chitosan crosslinked with glutaraldehyde was used as second crosslinked polymer network in acrylamide monomer reaction mixture to synthesize third generation superporous hybrid hydrogels (SPHH). Two type of drying conditions were given i) oven drying at 55°C ii) freeze drying. Ethanol and SGF treatment was given before application of different drying conditions. Highest swelling ratio was observed in case of ethanol treated oven dried batches in all the generations though the swelling time showed no significant difference and was found to be less than 10 minutes. This may be due to the preservation of capillary channels by the ethanol treatment because it displaces the water and maintain the integrity of pores during the subsequent drying process. Density, void fraction and porosity were not affected considerably by the treatment and subsequent drying conditions but the maximum porosity was found in case of ethanol treated batches. Scanning Electron Microscopy (SEM) images showed the presence of uniformly distributed pores with interconnected capillary channels in ethanol treated oven dried batches as compared to other batches (SGF treated). Maximum mechanical strength was found in case of third generation hydrogels (SPHH) which may be due to crosslinking by second polymeric network.
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