Preparation and characterization of N-isopropylacrylamide/carboxymethylated chitosan hydrogel |
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| Authors: | YANG Li-ming CHEN Jie WANG Sheng |
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| Institution: | Department of Chemical Engineering and Technology,School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,P.R.China |
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| Abstract: | Poly (N-isopropylacrylamide) (PNIPAAm)/carboxymethylated chitosan (CMCH) hydrogels were prepared by irradiating the aqueous solution mixture of NIPAAm and CMCH by 60Co γ-ray. The effects of feed ratio of NIPAAm and CMCH, temperature, pH and ionic strength on the swelling ratio of PNIPAAm/CMCH hydrogels were studied. The results show that the addition of CMCH shifts the lower critical solution temperature (LCST) of the PNIPAAm hydrogel to higher temperature. The PNIPAAm/CMCH hydrogel displays not only pH- and thermo- sensitivity, but also ion-sensitivity. Differential scanning calorimetry (DSC) was applied for the determination of the LCST of the hydrogel. |
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| Keywords: | carboxymethylated chitosan(CMCH) N-isopropylacrylamide(NIPAAm) hydrogel temperature-sensitive pH-sensitive |
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