Properties of Regenerated Cellulose Short Fibers/Cellulose Green Composite Films

Abstract

Green composites of regenerated cellulose short fibers/cellulose were prepared by dissolving cellulose in a green solvent of 7% NaOH/12% Urea aqueous solution that was pre cooled at -12°C. The effect of fiber loading on the tensile, optical, thermal degradation and cell viability was studied. The tensile properties of cellulose were improved by the regenerated cellulose fiber reinforcement. The interfacial bonding between the fibers and matrix was assessed using the fractographs and found it to be good.

Thermoplastic polyurethane composites prepared from mechanochemically activated waste cotton fabric and reclaimed polyurethane foam

“…The results demonstrate that the mechanochemically activated WCF was low in cost but was an efficient reinforcing filler for the PU matrix. The reinforcing effect of cellulose was consistent with the results of other researchers 37–39…”

Cellulose in NaOH–water based solvents: a review

“…To prepare all-cellulose composites, cellulose "macro" fibres, ramie and regenerated fibres, were randomly dispersed in aqueous NaOH-urea, and films were prepared via wet casting (Nadhan et al 2012;Yang et al 2010/). As compared to a non-reinforced cellulose films made from the same solution, light transmittance slightly decreased (by 10-20 %) and mechanical properties increased in terms of Young's modulus (from 4 to 6 GPa) and tensile strength (from 100 to 120 MPa) and decreased for elongation at break (from 7 to 2-3 %), see Table 4.…”

All-cellulose composites via short-fiber dispersion approach using NaOH–water solvent

“…The "short-fiber" all-cellulose composites can be produced via cellulose incomplete dissolution (many studies use microcrystalline cellulose) (Gindl and Keckes 2005;Duchemin et al 2009; Abbot and Bismarck 2010) or through fiber dispersion in cellulose solution (Ouajai and Shanks 2009;Yang et al 2010;Nadhan et al 2012;Labidi et al 2019). The latter mimics the production of conventional short-fiber polymer composites.…”

“…Until now, three solvents have been used to prepare all-cellulose composites with "short-fiber" approach. The most studied is lithium chloride/dimethylacetamide (LiCl/DMAc) (Gindl and Keckes 2005;Duchemin et al 2009; Abbot and Bismarck 2010) along with NaOH-water without additives (Labidi et al 2019) or with urea (Yang et al 2010;Nadhan et al 2012), and N-methyl-morpholine-N oxide monohydrate (NMMO) (Ouajai and Shanks 2009). Aside the solvent type and the grade of cellulose used for the matrix and as reinforcing fibers, other numerous processing parameters can be varied.…”