フィブロイン・キトサン複合膜の構造特性

概要

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The physical properties of silk fibroin/chitosan composite films were examined by using FTIR, DSC, TMA, WAXD measurements. The FTIR spectra of the composite films revealed overlapping absorptions that were attributed to silk fibroin and to chitosan. The DSC curve of the composite film (SF90/CS10) overlapped the DSC curves of silk fibroin and chitosan. The length of the silk fibroin film extended above 175°C (first extension temperature) and above 270°C (second extension temperature), exhibiting thermal instability as regards sample length during the heating process. The length of composite films containing high amount of chitosan did not extend even at the first extension temperature, suggesting increased thermal stability. The X-ray diffraction (WAXD) profiles of the composite films overlapped the diffraction curves of silk fibroin and of chitosan. The elongation when the silk fibroin film broke was as low as 0.7%, suggesting very brittle tensile properties. The elongation when the silk fibroin/chitosan composite films broke increased as the chitosan content increased, thus implying an enhancement in the elongation of the composite films with increasing chitosan content. (*E-mail: tsukada@shinshu-u.ac.jp)
日本シルク学会の論文