Journal
CARBOHYDRATE POLYMER TECHNOLOGIES AND APPLICATIONS
Volume 3, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.carpta.2022.100193
Keywords
Cellulose II; Semi-crystallinity; beta-sheet; Imidazolium; Hydrogen peroxide
Categories
Funding
- NSF-DMR-RUI [1809354, 1809541]
- Rutgers-Camden Arts and Sciences Start-up Package
- State of NJ ELF Grant
- Center for Computational and Integrative Biology TA Funds
- NSF-MRSEC [17-20530]
- NSF-MRI [17-25969]
- ARO DURIP [W911NF17-1-02822]
- University of Pennsylvania
- NSFCMMI [2037097]
- NSF-DMR [2104376]
- Direct For Mathematical & Physical Scien [1809354, 2104376] Funding Source: National Science Foundation
- Division Of Materials Research [1809354, 2104376] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1809541] Funding Source: National Science Foundation
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This study reports the tuning of semi-crystallinity in a blended cellulose/silk-fibroin biocomposite using ionic liquids and coagulation agents. The results show that the solvent anion type and hydrogen peroxide concentration affect the morphology and thermal stability of the regenerated materials. The size of carbohydrate microcrystals is also influenced by the solvent anion type and hydrogen peroxide concentration.
This work reports how to tune the semi-crystallinity of a blended microcrystalline cellulose/silk-fibroin biocomposite using ionic liquids and various coagulation agents. The morphological and thermal properties of a blended 1:1 polymeric system are studied as a function of polymer fabrication parameters. Ionic liquids, 1-ethyl-3-methylimidazolium acetate verses 1-ethyl-3-methylimidazolium chloride, are used as competing solvent types and six hydrogen peroxide solutions (1-25%) plus water are used as varying coagulation agents. Analysis of the results demonstrate that solvent anion type, Ac verses Cl, affects protein secondary structure formation, and that solvent anion type and the concentration of hydrogen peroxide changes morphology and thermal stability of the regenerated materials. Polymers dissolved in 1-ethyl-3-methylimidazolium acetate are less thermally stable than those dissolved in 1-ethyl-3-methylimidazolium chloride. Furthermore, carbohydrate microcrystal size is positively correlated to hydrogen peroxide concentration upon fabrication and is calculated to have either a gradual or step transition increase in microcrystal size depending upon the solvent's anion type.
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