Abstract
This work describes the synthesis of glycerol-derived polyurethane nanocomposite films containing unmodified cellulose nanowhiskers (CNW) or hexamethylene diisocyanate-modified cellulose nanowhiskers (HDICNW) as a mechanical support. Cellulose was prepared from sugarcane bagasse using a delignification and whitening approach that is wholly free of chlorine. CNW’s were obtained by acid hydrolysis in hydrochloric acid. The formation of nanocomposites was demonstrated by NMR, TEM, FTIR and WAXD. The films with different concentrations of CNW and HDICNW were characterized by FTIR spectroscopy, and stress-strain measurements. The samples experienced plastic deformation as subjected to an increasing elongation load, and right after yield limit, they fractured without necking. In such a case, the limit tension, which is the maximum stress supported by the sample, matches with the rupture tension. Polyurethane nanocomposites with CNW (CNW-PU) showed values of modulus of elasticity and tensile strength higher than HDICNW-PU.
Highlights
Polymer-based nanocomposites involving materials from renewable sources have been the target of important scientific investigations aiming at preserving the environment and proving a better standard of life and social status
The limit tension, which is the maximum stress supported by the structure of the sample, matches with the rupture tension
cellulose nanowhiskers (CNW)-PU5 showed the highest values of E, T, L, and toughness, comparatively to other nanocomposites
Summary
Polymer-based nanocomposites involving materials from renewable sources have been the target of important scientific investigations aiming at preserving the environment and proving a better standard of life and social status. Applications of naturally occurring modifiers, such as natural fibers, appear to be an innovative approach of a great scientific interest (BALZER et al, 2007; NECHWATAL et al, 2003; PLAYNE, 1984). Brazilian fibers show great potential as modifier for thermoplastic polymers. The production of ethanol from sugarcane bagasse. The main waste from production of ethanol from sugarcane is bagasse. It is the waste from production of biodiesel as obtained through a reaction route having ethanol as a basic insume
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