Abstract
ABSTRACT This study investigates the physical and mechanical properties of nanostructured films produced from Pinus sp. kraft pulp. To obtain the nanocellulose, the bleached kraft pulp was submitted to six different grinding regimes: two, five, ten, 20, 30, and 40 passes through the grinder. The influence of the number of passes was evaluated through the films’ physical and mechanical properties. The results show that the nanofibers reduced the thickness and considerably increased the density values of the fabricated films. The tensile strength increased more than 300% and the burst index was ten times higher in relation to normal papers. The more compact structure and lower porosity caused by the larger contact surface between nanofibers in the nanostructured films resulted in higher values of density, tensile strength, and burst resistance.
Highlights
AND OBJECTIVESThe growing search for products that cause less impact on the environment has motivated the study and application of biodegradable and renewable raw materials
The results presented in this article allow the conclusion that the films constituted of nanofibers from mechanical defibrillation in a grinder display significant improvement in their physical and mechanical properties when compared to traditional papers (T00)
The average density value of the nanostructured films increased more than 200% in comparison with the papers formed by fibers that did not undergo mechanical treatment
Summary
AND OBJECTIVESThe growing search for products that cause less impact on the environment has motivated the study and application of biodegradable and renewable raw materials. Attainment and use of the cellulose’s nanofibers and its applications in composite materials have attracted attention of researchers due to its high resistance and rigidity and low weight (Julkapli & Bagheri, 2017). Besides those desirable mechanical properties, cellulose nanofibers present other interesting features for reinforcing nanocomposites, enabling optically transparent films with a very low thermal expansion coefficient that are still foldable (Fall et al, 2014; Kargarzadeh et al, 2017; Shimizu et al, 2016; Toivonen et al, 2015). The high percentage of cellulose in wood, which in terms of mass is the most important component of the cell wall (occupying about 45%), along with the fact that as a renewable material it has less impact on the environment, encourages research to produce nanofibers from this resource
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