Based On The Interpenetrating Network Structure Of Cellulose/protein And Polysaccharide Composite Membrane Preparation

Cellulose is a natural polysaccharide in nature with a rich source, and it is a renewable and environment-friendly material which has a very broad application prospect. Sodium alginate, carboxymethyl chitosan, silk fibroin have their own excellent performances. Sodium alginate, carboxymethyl chitosan, silk fibroin and cellulose have good compatibility. The composite film was obtained by different methods to study the functional morphology and the properties.In this project, the cellulose dissolved in NaOH-urea - thiourea system, is prepared by blending or cross-linking to cellulose/silk fibroin, cellulose/sodium alginate and cellulose/carboxymethyl chitosan icomposite film. The infrared spectroscopy and scanning electron microscopy analysis the structure of composite membrane and the membrane transmittance, mechanical properties, water vapor permeability, moisture absorption properties were tested.FTIR, SEM analysis showed that in the composite membrane the components have good compatibility and physical entanglement with each other between the components. The results show that the cellulose/silk fibroin, cellulose/sodium alginate and cellulose/carboxymethyl chitosan composite film have better performance than the pure cellulose membrane, especially the mechanical properties and the light transmission properties. The composite film prepared by chemical cross-linking has better properties in the moisture absorption performance than the blend film, but the cross-linked structure is more dense which makes the water vapor permeability and other properties declined. The performance of the cellulose/silk fibroin composite film is better than the other two composite films.