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    Tratamento químico da fibra natural de eucalipto com silano para produção de biocompósitos
    (Universidade Federal de São Paulo (UNIFESP), 2019-12-13) Ferreira, Fernanda Cristina Zanin [UNIFESP]; Guerrini, Lilia Muller [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    There are several advantages to using natural fibers to produce biocomposites using such high-density polyethylene as a matriz: low-cost, partially biodegradable, low density, good flexibility and high elastic modulus. However, there are some disadvantages in using such fibers for the production biocomposites as the low adhesion to these polymeric matrices due to the fiber being hydrophilic and the matrices generally being hydrophobic. To improve this adhesion, some chemical treatments may be applied to modify the surface of the fibers. One of these treatments is the modification using silane agents. In this context, the objective of this work was to modify the bleached (FB) and brown (FM) eucalyptus fiber using the aminopropyl triethoxysilane silane agent, in the percentages of 1, 2 and 3% of fiber mass silane and then biocomposites were produced. The modified fibers were analyzed by Transform Infrared Spectroscopy (FTIR) techniques to evaluate chemical structures, thermogravimetric analysis (TGA) to evaluate thermal transitions and degradations, scanning electron microscopy (SEM) to evaluate fiber morphology, ash analysis to verify the amount of inorganic material, respectively. Through the obtained results, the fibers selected with 3% silane agent were selected to produce the 15% and 30% by weight HDPE biocomposites. The morphologies of the biocomposites were evaluated by scanning electron microscopy (SEM), ash analysis to determine the amount of organic and inorganic material, differential exploratory calorimetry (DSC) and the mechanical properties of biocomposites as tensile strength tests. impact resistance and water absorption. The addition of 15wt% of fiber content of 3% silane treated white fiber reinforcement proved to be most suitable for the production of biocomposites with good fiber / matrix adhesion. Silane treatment of these fibers promoted significant increase in physical and mechanical properties such as Izod traction and impact. There was no significant effect of this treatment for brown fibers.