期刊
CELLULOSE
卷 24, 期 4, 页码 1775-1789出版社
SPRINGER
DOI: 10.1007/s10570-017-1208-y
关键词
Cellulose; Silk; X-ray scattering; Microfibril; beta-Sheets; Morphology
资金
- Rutgers University-Camden Laboratory Start-up funds
- State of New Jersey ELF Grant
- Rowan University Start-up Grants
- NSF-MRI Program [DMR-1338014]
- New Jersey Space Grant Consortium
Cellulose and silk blended biomaterial films were regenerated from ionic liquid solution and investigated to characterize and understand the effect of inter- and intra-molecular interactions upon the morphology and thermal properties. The blended films were dissolved in 1-allyl-3-methylimidazolium chloride ionic liquid, coagulated and regenerated with water. Various characterization techniques were implemented to characterize structural, morphological and thermal properties: FTIR, SEM, TGA, DSC and X-ray scattering. The results showed that the cellulose microcrystalline structure and beta-sheets from the silk can be disrupted by inter- and intra-molecular hydrogen bonds forming intermediate semicrystalline or amorphous structures. The SEM showed morphological effects of such interactions that cause varying thermal degradation and glass transition temperature. The X-ray scattering confirms such findings at the molecular level, demonstrating that the cellulose microfibril diameter decreases as the silk content increases. It also shows that the beta-sheets size increases as the cellulose content increases. These various techniques provide evidence that suggest the hydrogen bonds between the beta-sheets and the glucose units in the cellulose chains control the thermal and structural properties of the blended films, changing the morphology and physicochemical properties.
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