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P. S. Souza et al. / Procedia Engineering 10 (2011) 2040–2045 2043 3.2. Mechanical properties Mechanical properties of composites are summarized in Table 2. Composites presented higher tensile strength and modulus when compared to the pure high density polyethylene (HDPE). Table 2. Mechanical properties of the materials Samples HDPE HDPE/FT5% HDPE/FT10% (Reinforcement in wt%) Tensile strength (MPa) 15.7 ± 1.1 22.8 ± 0.7 24.1 ± 0.6 Tensile Modulus (MPa) 732.5 ± 90.6 1239.6 ± 72.2 1557.3 ± 88.8 The amount of added reinforcement also contributes to variation of the tensile modulus. Fibers insertion can contribute to the modulus increase, because the Young’s modulus of the fibers is higher than the thermoplastic modulus. However, to obtain a significant increase, a good interfacial bond between fiber and matrix is necessary. The tensile strength exhibited a good interaction between fiber and matrix, with increases of 45.2% and 53.5%, compared to the pure polymer. However, HDPE/FT 10% composite presents higher average values for tensile strength and modulus compared to the pure HDPE and HDPE/FT 5% composite. Experimental results in Table 2 may be explained by interaction between fiber and matrix during the mixture process. Of this way, can be affirmed that the modified textile fibers made was adequate. This can be confirmed by the fracture surface analysis as can be observed Figure 2. It corresponds to the surface of fractured HDPE/ FT5% composite (Figure 2A) and HDPE/ FT 10% composite (Figure 2B). Analyzing fractures is observed a significantly improve in the compatibility between the matrix and fibers, and the matrix was well bonded to the fibers. 50 m (a) (b) Figure 2. SEM of fractures composites: (a) HDPE/ FT 5%; (b) HDPE/ FT 10%. 50 mPDF Image | Mechanical properties of HDPE textile fibers composites
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