Abstract
Abstract The article presents a method of obtaining films based on carboxymethyl polysaccharide derivatives cross-linked with citric acid and reinforced with cellulose fibers (CFs). The addition of CFs to a film improves the mechanical properties of the composite. With the increase of filler content, the water solubility drops from 64 to 61%, respectively, for a system without a filler and that containing 7 wt% CFs, whereas Young’s modulus increases from 4.8 to 24.8 MPa for a film containing 5 wt% filler.
Highlights
The etherification of starch to a carboxymethyl derivative allows obtaining a polymer soluble in cold water
A natural composite based on two polysaccharides, carboxymethyl starch (CMS) and carboxymethyl cellulose (CMC), reinforced with Cellulose fibers (CFs) was obtained
To obtain an aqueous dispersion of CFs, 100 g of water and [1, 3, 5] or 7 wt% of CFs based on the dry weight of the mixture of CMS and CMC were added to a reactor; the system was stirred for 30 min
Summary
The etherification of starch to a carboxymethyl derivative allows obtaining a polymer soluble in cold water. Cellulose fibers (CFs) (about 100 μm long) cleaned and separated from other substances (e.g., lignin) exhibit good chemical resistance and good mechanical properties as well as a relatively low price (Ma et al 2011). Chemical and physical modifications carried out on CFs are aimed at increasing their adhesion to polymer matrices, which allows improving the mechanical properties of the composite (Mohmamed et al 2010). CFs have been used in the production of membranes for ship water treatment and industrial treatment as well as biodegradable reinforcements in composites. The influence of CF filler content on the physicochemical properties of a CMS/CMC based film has been determined. A natural composite based on two polysaccharides, CMS and CMC (with citric acid [CA] as the crosslinking agent), reinforced with CFs was obtained
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