Controlling the structure and properties of semi-crystalline cellulose/silk-fibroin biocomposites by ionic liquid type and hydrogen peroxide concentration

Carbohydrate Polymer Technologies and Applications

David Salas-de la Cruz¹  Xiao Hu²  Stacy A. Love³ 

[1] Astronomy, Department of Biomedical Engineering, Rowan University, Glassboro, NJ United States;;Department of Physics &The Center for Computational and Integrative Biology, Rutgers University, Camden, NJ United States;

关键词: Cellulose II;    Semi-crystallinity;    β-sheet;    Imidazolium;    Hydrogen peroxide;   

DOI  :  

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown