Lignocellulose Cryogel From Flax Fibers-Ionic Liquid Solution Under Freezing Conditions
The ability of ionic liquids (IL) to dissolve cellulose and other lignocellulosic polymers at high concentrations qualifies them for the use in the development of novel regenerated cellulose products as well as in processes for the fractionation of lignocellulosic biomass. Lignocellulosic fibers from annual crops have a higher aspect ratio than wood fibers and are therefore more effective as reinforcements for composites . Natural fibers have a number of advantages as they are biodegradable, chemically stable, low cost and lightweight. Flax (Linum usitatissimum L.) is one of the most widely utilized lignocellulosic materials. Flax fibers are very promising because they show high mechanical strength, chemical stability, biodegradability, non-toxicity and are composed mostly of cellulose (70%) . Characterization of synthesized cryogels was carried out using different characterization techniques like FTIR & SEM. In this context, bio-based new natural materials have been explored, highly porous and ultra light based Flax fiber, Flax prepared by dissolution in ionic liquids and coagulated by adding water and finally dried by Freeze drying to obtain the cryogels Flax from raw lignocellulosic materials. Using electron microscopy, the Flax materials morphology was studied. All cryogels were compressible and consisted of nanofibrillar biomaterial network with open-pore structure.
Keywords� Biopolymer; Cryogel; Flax fibers; Ionic liquid, Porosity.