Fabrication of Cellulose –Silk Composite in Liquid Phase with Green Solvent

Document Type : Research Paper

Authors

1 Associate Professor, Faculty of Natural Resources, University of Tehran, Karaj, I. R. Iran

2 M.Sc., Faculty of Natural Resources, University of Tehran, Karaj, I. R. Iran

3 Professor, Faculty of Natural Resources, University of Tehran, Karaj, I. R. Iran, and Laboratory of Biocomposite Technology, Institute of Tropical Forestry & Forest Products (INTROP), UniversityPutra, Malaysia, Putra,(UPM)

Abstract

In this research, cellulose-silk composites production in liquid phase was studied. In this respect,
BMIMCl ionic liquid was synthesized in the laboratory and was used for dissolution purpose. After
dissolution of the biopolymers and mixing them in the liquid phase, obtained suspension was spread in
a Petri dish. Then, the composite gel was washed with running methanol to remove the IL, cellulose
and cellulose-silk composite films were prepared and after processing, their transparency, water
absorption and thickness swelling, water vapor permeability and tensile strength were determined.
Also, further characterization of structure was performed using XRD technique. Results showed that
both polymers were appropriately dissolved in Ionic liquid and the cellulose-silk composite was
prepared in the liquid phase homogeneously. Water absorption, thickness swelling and water vapor
permeability of the composites were increased but its transparency decreased comparing to pure
cellulosic film.Original cellulose (cellulose I) was deformed to Cellulose IIcrystalline structure, during
dissolution and regeneration. Also, tensile strength and Young's modulus of the composite were less
than cellulosic film although the strain at break point was increased.

Keywords


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