期刊
POLYMER DEGRADATION AND STABILITY
卷 95, 期 2, 页码 234-244出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2009.10.007
关键词
Chitosan; Substituted chitosan; N-Succinyl chitosan; Degradation; Radiolysis; Gamma radiation
资金
- The Development and Promotion for Science Technology Talents Project of Thailand (DPST)
- The Center for Petroleum, Petrochemicals and Advanced Materials, Chulalongkron University
- Kansai University
N-Succinyl chitosan (N-SC) products with various degrees of substitution were synthesized by a direct reaction between chitosan and succinic anhydride. The susceptibility of the as-synthesized polymers to degradation upon their exposure to gamma-ray radiation was investigated. The results were compared with the as-received chitosan. The size exclusion chromatographic results showed that chitosan and N-SC products in their dilute aqueous solution state were more subservient to degradation by gamma-ray radiation than in their solid film state, despite the much less exposure to the radiation (i.e., 5-30 kGy for the solutions versus 20-100 kGy for the films). Increasing the radiation dose resulted in the rather monotonous decrease in the molecular weights of the polymers. Structural analyses of the irradiated polymers by Fourier-transformed infrared spectroscopy (FT-IR) and UV-visible spectrophotornetry indicated the increase in the amount of carbonyl groups with the radiation dose. The formation of the carbonyl groups suggested that the radiolysis of chitosan and N-SC products occurred at the glycosidic linkages. In addition, FT-IR, elemental analysis and proton nuclear magnetic resonance spectroscopy (H-1 NMR) results suggested that gamma-ray radiation affected both the N-acetyl and N-substituted groups on the polymer chains. (C) 2009 Elsevier Ltd. All rights reserved.
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