Linear viscoelasticity of thermoassociative chitosan-g-poly(N-isopropylacrylamide) copolymer |
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Authors: | Nispa Seetapan Katanchalee Mai-ngam Nopparat Plucktaveesak Anuvat Sirivat |
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Institution: | (1) National Metal and Materials Technology Center, Pathumthani, 12120, Thailand;(2) Department of Chemistry, Thammasart University, Pathumthani, 12121, Thailand;(3) The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok, 10330, Thailand |
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Abstract: | Chitosan-g-poly(N-isopropylacrylamide) (chitosan-g-PNIPAM) was synthesized and characterized rheologically in aqueous solutions. The copolymer solution exhibits a thermoassociative behavior in which its elastic response dramatically increases when temperature is above the critical temperature or the association temperature, T
assoc. The copolymer at low concentration shows typical solution property. When the temperature is increased up to the critical temperature, the copolymer exhibits a gel-like characteristic due to the formation of physical cross-links between chitosan backbones through the self-aggregation of PNIPAM side chains. At high concentration, the system exhibits a weak elastic response due to the entanglement of the copolymer at 25°C. As temperature is raised above T
assoc, the system shows a strong elastic behavior due to the formation of additional physical cross-links via the aggregation of PNIPAM side chains. Chitosan-g-PNIPAM offers an attractive associating behavior in aqueous solution at temperature close to the body temperature, thus providing potential applications in pharmaceutical and medical industries. |
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Keywords: | Linear viscoelasticity Thermoassociative Chitosan Poly(N-isopropylacrylamide) |
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