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Temperature and pH sensitive hydrogels composed of chitosan and poly(ethylene glycol)

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Summary

Chitosan based semi-interpenetrating polymer network (semi-IPN) hydrogels containing different amounts of poly(ethylene glycol) (PEG) were prepared. The crosslinking of the hydrogels was achieved by using a naturally occurring nontoxic cross-linking agent genipin. The swelling behaviour of these hydrogels was studied by immersing the films in deionized water at 25, 37 and 45 °C and in media of different pHs at 37 °C. Swelling was found to be dependent on temperature, pH of the medium and the amount of PEG in the gel. States of water in the hydrogels swollen in deionized water at 37 °C were determined using Differential Scanning Calorimetry (DSC). The equilibrium water content and the amount of freezing water in the swollen hydrogels increased with the increase in PEG concentration in the gels.

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Authors and Affiliations

  1. Division of Chemistry, Faculty of Science and Technology, University of the South Pacific, Suva, Fiji Islands

    Jagjit R. Khurma & Ashveen V. Nand

Authors
  1. Jagjit R. Khurma
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  2. Ashveen V. Nand
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Correspondence to Jagjit R. Khurma.

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Khurma, J., Nand, A. Temperature and pH sensitive hydrogels composed of chitosan and poly(ethylene glycol). Polym. Bull. 59, 805–812 (2008). https://doi.org/10.1007/s00289-007-0817-2

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  • DOI: https://doi.org/10.1007/s00289-007-0817-2

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