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P. S. Souza et al. / Procedia Engineering 10 (2011) 2040–2045 2041 These fibers present much advantages as reinforcement in polymers such as are biodegradability, abundance, health risks to be minimal, stiffness, impact resistance, low density, low flexibility during processing and less wear and tear resulting from the machine, desirable fibers aspect ratio and relatively high tensile and flexural modulus [10]. However certain drawbacks, such as the incompatibility between fibers and polymer matrices, the tendency to form aggregates during processing and the poor resistance to moisture, reduce the use of these natural fibers as reinforcements in polymers. Because of this, several treatments and modifications are being used to improve fibers/matrix compatibility, such as bleaching, acetylation, estherification and use coupling agent [11, 12]. Of this way, the objective of this work was available the effect of the modified textile fibers from industrial residue on mechanical properties high density polyethylene/textile fibers composites. The modification the fibers were evaluated by X-ray diffractometry (XRD) technique. 2. Experimental 2.1. Fibers The fibers textile residue used in this study were manufactured by provided by Primar in Juiz de Fora- MG. Chemical modification of the textile fibers from industrial residue were submitted to dilute acid pretreatment, under these conditions: 1.0% (w/v) H2SO4 solution in a 1:10 solid: liquid ratio, 120 ̊C for 10 min. After reaction the resulting solid material was separated by centrifugation, washed with water until neutral pH, and dried at 50 ± 5 ̊C to attain 50% moisture content. This modification was made to remove the soluble extractives and to facilitate adhesion between fibers and matrix 2.2. X-ray diffraction of fibers XRD measurements were performed on a Shimadzu diffractrometer model XRD6000. The diffracted intensity of CuK radiation (0.154 nm, 30 kV and 40 mA) was measured in a 2 range between 10o and 40o. The textile fibers samples (modified and unmodified) were subjected to crystallinity analysis. 2.3. Composites preparation Textile fibers modified were mixed with the HDPE in a thermokinetic mixer, model MH-50H, with speed rate maintained at 5250 rpm, in which fibers were responsible for 5 and 10 wt% in the composition. After the mixture, composites were dried and ground in mill, model RONE. Composites and pure HDPE were placed in an injector camera at 165 oC and 2 oC min-1 heating rate in a required dimensions pre- warm mold to obtain tensile specimen. 2.4. Mechanical properties Composites were analyzed in an EMIC testing machine (model DL2000), equipped with pneumatic claws. In the tensile tests, five specimens of composites were analyzed, with dimensions in agreement with the ASTM D 638 standard: 19 mm width, 165 mm length and 3.2 mm thickness and 10 mm min-1 crosshead speed. Samples submitted to tensile tests were cut and of the composites fractured surface were analyzed by scanning electron microscopy.PDF Image | Mechanical properties of HDPE textile fibers composites
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