期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
卷 140, 期 -, 页码 301-305出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotobiol.2014.08.017
关键词
Chitosan; Silk fibroin; Polymer mixtures; Thermal properties; Mechanical properties; UV-irradiation; Photodegradation; Photooxidation
资金
- Rector of Nicolaus Copernicus University, Torun [501-Ch]
- COST Action TD [1305 EC]
In the present paper the results regarding the influence of UV-irradiation with 254 nm wavelength on the thermal and mechanical properties and the intrinsic viscosity of chitosan/silk flbroin mixtures are presented. The mixture of chitosan and silk fibroin in solution and thin films made of chitosan/silk flbroin mixture obtained by solvent evaporation were submitted to the treatment with UV irradiation (wavelength 254 nm) for different time intervals. Mechanical properties of thin films made of chitosan/silk fibroin blends before and after UV-irradiation have been investigated by mechanical testing machine and compared with mechanical properties of chitosan films. The changes in such mechanical properties as ultimate breaking strength, percentage of elongation at break and Young Modulus have been investigated. The results have shown, that the mechanical properties of the blends were greatly affected by time of exposure to UV irradiation. Ultimate tensile strength and ultimate percentage of elongation decreased after UV irradiation of the blend. Increasing UV irradiation led to the decrease in Young's Modulus of the chitosan/silk fibroin blend. Viscosity of chitosan/silk fibroin mixtures decreased after UV-irradiation. Thermal properties of the mixtures have been only slightly altered by UV-irradiation. (C) 2014 Elsevier B.V. All rights reserved.
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