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2042 P. S. Souza et al. / Procedia Engineering 10 (2011) 2040–2045 2.5. Moisture absorption property Effect of moisture absorption on composites and pure HDPE were investigated in accordance to ASTM standards D570. The percentage of moisture absorption in these materials was calculated by weight difference between the samples immersed in water and the dry samples using the following expression (1): ΔM(%)=(Mf –Mi/Mi )*100 (1) where ΔM(%) is moisture uptake, Mf and Mi are the mass of the specimen after and before immersion. 3. Results 3.1. Characterization of fibers XRD studies of the modified and unmodified textile fibers from industrial residue were done to investigate the crystalline behavior of the fibers. The major peaks observed for fibers are at 2 diffraction angles of 15.1o, 16.9o and 22.8o representing (110) and (200) planes indicating the presence of type I cellulose as can be seen Figure 1. Table 1 presents the crystallinity index calculates according method utilized by Mulinari et al [2]. Table 1. Crystallinity index of the fibers Samples Unmodified textile fibers Modified textile fibers Crystallinity (%) 69 78 Unmodified textile fibers Modified textile fibers Intensity (a.u) 10 20 30 40 50 60 70 2θ (degree) Figure 1. X-ray diffractogram of the textile fibers from industrial residue.PDF Image | Mechanical properties of HDPE textile fibers composites
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