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Bruno Dorneles de Castro,Kláudia Maria Machado Neves Silva,Rômulo Maziero,Paulo Eustáquio de Faria,Priscila Pereira Silva-Caldeira,Juan Carlos Campos Rubio 한국섬유공학회 2020 Fibers and polymers Vol.21 No.8
The use of treatments in natural fibers is largely used, because it can improve the interfacial adhesion of polymercomposites. However, the choice of the most appropriate treatment should take into account environmental factors, due to theneed of new materials to meet requirements related to the concept of sustainability. This article investigated the influence ofthe mercerization, acetylation and gamma radiation treatments on the mechanical properties of sisal fibers, to use incomposite materials. Experimental conditions were defined with different concentrations of reagents and radiation doses inorder to understand the impact of these reactions on the tensile properties of sisal fibers. Thermal gravimetric analysis (TGA)and Fourier Transform Infrared (FTIR) spectroscopy were used to investigate the fiber degradation process and the chemicalmodifications after the treatments. The use of mercerization (0.1 M and 1.0 M NaOH concentrations) combined withacetylation increased the hydrophobic character of the sisal fiber, which may improve its interaction with polymeric matrices. In addition, mercerized sisal fiber at 0.5 M NaOH concentration, exposed to 25 kGy gamma radiation dose, showed physicaland chemical structural changes that positively influence the fiber-matrix adhesion in polymer composite materials. Alltreatments made can reduce the natural tensile properties of the sisal fibers, because they can remove fundamentalcomponents to the structure and the stiffening of these fibers. Considering changes in the mechanical behavior, the use ofgamma radiation presented similar results of the traditional chemical treatments, being less aggressive to the fibers and notcausing the same negative impact on the environment.
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