The effect of casting solvent on the structural characteristics and miscibility of regenerated silk fibroin/Poly(vinyl alcohol) blends |
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| Authors: | In Chul Um Young Hwan Park |
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| Institution: | (1) Department of Natural Fiber Sciences, Kyungpook National University, 702-701 Daegu, Korea;(2) Department of Biosystems and Biomaterials Science and Engineering, Seoul National University, 151-921 Seoul, Korea |
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| Abstract: | Regenerated silk fibroin(SF)/Poly(vinyl alcohol)PVA] blend films were prepared using different casting solvents, water and
formic acid, to elucidate the effect of casting solvent on the structure and miscibility of SF/PVA blends. FTIR and XRD measurement
suggested thatβ-sheet conformation of SF was not changed by addition of PVA in case of formic acid casting and the casting solvent determined
the crystallized component of SF/PVA, leading to a different trend in the overall crystallinity between the two blends. The
casting solvent had a dominant role in deciding phase behavior and molecular miscibility of blend films. SEM observation and
DMTA measurement elucidated that water solvent produced phase-separated blend films while formic acid yielded one phase blend
films with partial miscibility in molecular level indicating that the miscibility of SF blend can be improved by choosing
a proper co-solvent. |
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| Keywords: | Regenerated silk fibroin Poly(vinyl alcohol) Blend film Formic acid Miscibility Structural characteristics |
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