Effect of coagulation agents on morphology and structure of cellulose/silk fibroin films with 1-butyl-3-ethylimidazolium chloride as solvent

Abstract

Cellulose/silk blend solutions were prepared in 1-butyl-3-methylimidazolium chloride [BMIM]Cl and films were subsequently formed from coagulation baths. Fourier Transform Infrared (FTIR) spectroscopy, wide-angle X-ray diffraction (WAXD) and scanning electron microscope (SEM) were carried out to compare the influence of coagulation agents on the weight content of silk fibroin (wSF), secondary structure and morphology of cellulose/silk blend films. Rough and scaly films were formed due to rapid crystallisation induced by ethanol. When films were coagulated in acetonitrile, a change from random coil to b-sheet structure of silk fibroin and from cellulose I to cellulose II of cellulose occurred favourably. When blend films were coagulated in water, there was a protein component extraction which diffused into the coagulation bath.

A Hierarchical Model To Understand the Processing of Polysaccharides/Protein-Based Films in Ionic Liquids

“…This simplified framework that involves all of the stages of the processing of the material just described can, in principle, be applied to other mixtures and used to predict the properties of the final blend. While not the primary focus of this paper, we want to point out that, in principle, the structure and properties of the material can be tuned at the level of the hydrogel, by using different solvents and alternative processing than that given here. ,− For instance, an important feature of many biopolymers, including the ones studied here, is the formation of β-sheets, which can be tuned with alcohol-based solvents. , …”

Preparation and characterization of cellulose carbamate membrane with high strength and transparency

“…The solubility is not high and the time is long. N‐methylmorpholine‐N‐oxide (NMMO) has strong performance of dissolving the cellulose by destroying the hydrogen bond in the cellulose, 24 dispersing the cellulose powder in NMMO solution, and stirring it quickly after heating at 80°C for 12 h, cellulose solution 25 was prepared; Ionic liquid can destroy the hydrogen bond network within and between cellulose molecules by acting on the functional groups of cellulose, dissolve cellulose, 26 put cellulose powder and ionic liquid (BmimCl) into the double screw extruder, and successfully obtain cellulose solution 27 ; LiCl/DMAc system can also dissolve a small amount of cellulose under heating conditions cellulose, but it takes a long time 28 . Although these dissolving systems and conditions can directly dissolve cellulose, there are a series of problems, such as low solubility, high dissolving cost and long dissolving time.…”