Effect of Crosslinking Agents, pH and Temperature on Swelling Behavior of Cross-linked Chitosan Hydrogel
Keywords:
Superabsorbent, Chitosan, Hydrogel, Crosslinking, SwellingAbstract
Superabsorbent hydrogels are able to absorb and keep large amounts of aqueous fluid. Superabsorbent polymer based crosslinked chitosan hydrogels were synthesized by crosslinking chitosan with various crosslinking agents, i.e. formaldehyde, acetaldehyde and glutaraldehyde. The Swelling behavior of the crosslinked chitosan hydrogels was measured by immerse the gels and the effect of crosslinking agent on water absorbency has been investigated. The crosslinked chitosan hydrogel by acetaldehyde exhibited a higher swelling ratio up to 350%. The influence of external stimuli such as pH and temperature of the swelling media has been observed. Hydrogels showed a typical pH and temperature responsive behaviour such as low pH (pH 4) and high temperature (55oC) has maximum swelling while high pH (pH 10) and low temperature (35oC) show minimum swelling. The film of crosslinked chitosan hydrogels were characterized by Fourier Transform Infrared Spectroscopy (FTIR).References
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