학술논문
Synthesis and characterization of thermo- and pH- sensitive hydrogels based on Chitosan-grafted N-isopropylacrylamide via [gamma]-radiation
Document Type
Report
Source
Radiation Physics and Chemistry. Sept, 2005, Vol. 74 Issue 1, p26, 5 p.
Subject
Language
English
ISSN
0969-806X
Abstract
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.radphyschem.2004.10.007 Byline: Hong Cai (a), Zheng Pu Zhang (a), Ping Chuan Sun (a), Bing Lin He (a), Xiao Xia Zhu (a)(b) Keywords: Chitosan; N-isopropylacrylamide; Thermo- and pH-sensitive; Graft; [gamma]-radiation Abstract: Thermo- and pH-sensitive hydrogels were prepared by graft copolymerization of chitosan (CS) and N-isopropylacrylamide via [gamma]-radiation. The effects of monomer concentration and irradiation dose on grafting percentage and grafting efficiency were studied. The graft copolymers were characterized by.sup.13C CP/MAS NMR and thermogravimetric analysis. The pH and thermosensitivity and swelling properties of the hydrogels were investigated. The results showed that the grafting percentage and grafting efficiency increased with the increase of monomer concentration and total irradiation dose. The highest grafting percentage is 620%, the lower critical solution temperature (LCST) of this hydrogel is about 28[degrees]C. Author Affiliation: (a) State Key Laboratory of Functional Polymeric Materials for Adsorption and Separation, Tianjin, 300071, China (b) Departement de chimie, Universite de Montreal, C.P. 6128, Succursale Centre-ville, Montreal, QC, Canada H3C 3J7 Article History: Received 30 September 2004; Accepted 12 October 2004