Abstract:
:Structural characteristics and thermal and solution properties of the regenerated silk fibroin (SF) prepared from formic acid (FU) were compared with those of SF from water (AU). According to the turbidity and shear viscosity measurement, SF formic acid solution was stable and transparent, no molecular aggregations occurred. The sample FU exhibited the beta-sheet structure, while AU random coil conformation using Fourier transform infrared (FTIR), X-ray diffraction (XRD), and differential scanning calorimetry. The effects of methanol treatment on samples were also examined. According to the measurement of crystallinity (XRD) and crystallinity index (FTIR), the concept of long/short-range ordered structure formation was proposed. Long-range ordered crystallites are predominantly formed for methanol treated SF film while SF film cast from formic acid favors the formation of short-range ordered structure. The relaxation temperatures of SF films measured by dynamic thermomechanical analysis supported the above mechanism due to the sensitivity of relaxation temperature on the short-range order.
journal_name
Int J Biol Macromoljournal_title
International journal of biological macromoleculesauthors
Um IC,Kweon HY,Park YH,Hudson Sdoi
10.1016/s0141-8130(01)00159-3keywords:
subject
Has Abstractpub_date
2001-08-20 00:00:00pages
91-7issue
2eissn
0141-8130issn
1879-0003pii
S0141813001001593journal_volume
29pub_type
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journal_title:International journal of biological macromolecules
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journal_title:International journal of biological macromolecules
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journal_title:International journal of biological macromolecules
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journal_title:International journal of biological macromolecules
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journal_title:International journal of biological macromolecules
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