Title: SYNTHESIS AND CHARACTERIZATION OF STARCH AND ACRYLAMIDES BASED HYDROGELS
Page Range: p.151-165
Author(s): Chauhan G S; Kumari A; Sharma R
File size: 524K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 13
Issue No: No. 2
Abstract
In order to synthesise a variety of hydrogels for use in drug delivery and environmental management technologies, starch was graft copolymerised with three acrylamides: acrylamide, 2-acrylamido-2-methylpropanesulphonic acid and N-isopropyl acrylamide. The synthesis was carried out at two different temperatures, including the gelatinisation temperature of starch (70 degrees C). A redox system, consisting of ammonium persulphate and ferrous ammonium sulphate was used to initiate the polymerisation reactions. Using the same reaction conditions that were used to obtain graft copolymers, crosslinked networks of all three acrylamides and starch were also synthesised in the presence of various concentrations of N,N-methylene bisacrylamide as crosslinker, and also at two different temperatures. The hydrogels were characterised by FTIR and thermal studies to identify some structural aspects and to obtain evidence of network formation. Water uptake by the hydrogels was studied as a function of time, temperature and pH level. Some of the hydrogels were found to be good absorbers of water and it was observed that the synthetic conditions affected their structure, which in turn affected their water uptake. The hydrogels produced were found to be environment-sensitive and showed significant volume transitions when small changes were made in their environment. These responses of the hydrogels to the changes in their environment can be effectively used in environmental management technologies for the remediation of pollutants and in drug delivery devices. 16 refs.
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