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The influence of UV-irradiation on thermal and mechanical properties of chitosan and silk fibroin mixtures

Paper ID Volume ID Publish Year Pages File Format Full-Text
29957 44448 2014 5 PDF Available
Title
The influence of UV-irradiation on thermal and mechanical properties of chitosan and silk fibroin mixtures
Abstract

•The mixtures based on chitosan and silk fibroin were obtained.•We show that UV-irradiation can modify the mechanical properties and the intrinsic viscosity of the mixtures.•Thermal properties of the mixtures can be slightly altered by UV-irradiation.

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 fibroin mixtures are presented.The mixture of chitosan and silk fibroin in solution and thin films made of chitosan/silk fibroin 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.

Keywords
Chitosan; Silk fibroin; Polymer mixtures; Thermal properties; Mechanical properties; UV-irradiation; Photodegradation; Photooxidation
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The influence of UV-irradiation on thermal and mechanical properties of chitosan and silk fibroin mixtures
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 140, November 2014, Pages 301–305
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us