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Structure and Characteristic of Chitosan/Bombyx mori Silk Fibroin Blend Filems  

Kim, Dong-Keon (Department of Applied Polymer Engineering, Miryang National University)
Kim, Hong-Sung (Department of Applied Polymer Engineering, Miryang National University)
Publication Information
Polymer(Korea) / v.29, no.4, 2005 , pp. 408-412 More about this Journal
Abstract
Structure and characteristic of the films blended chitosan matrix with silk fibroin, extracted from Bombyx mori, were studied by X-ray diffraction, differential scanning calorimetry, FT-IR spectra analysis, SEM photographs, contact angle measurement and water absorbency in order to use as biomaterials. The blend films of $0\~30 wt\%$ fibroin content were prepared in acetic solution with $Li^+$ ion. It was found that the crystallinity of chitosan/fibroin blend films was decreased by the presence of intermolecular interactions such as hydrogen bonding between animo groups of chitosan and carbonyl groups of fibroin. As the proportion of fibroin in the blend increased, anhydrous crystalline phase of chitosan disappeared, and hydrated crystalline phase decreased, and $\beta$-structure crystalline phase of fibroin was formed. Therefore the blend films were crystallized into two different crystalline region of chitosan and fibroin. Surface hydrophilicity and water absorbency increased with blending fibroin. Above 20 $wt\%$ fibroin content, hydrogel film was formed. The surface and section of the film showed uniform microstructure on SEM photographs.
Keywords
chitosan; silk fibroin; blend film; microstructure; hydrogel;
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