The compounding of recycled polypropylene (RPP) and wood saw dust (WSD) are carried out using five different filler loadings (0,10, 20, 30, 40, and 50%) with three WSD filler sizes (100, 212, and 300 mm). The composites are mixed and extruded using Haake Rheodrive 500 twin screw extruder. The mechanical and water absorption properties of composites are characterized accordingly. The results show that composites with a smaller particle size (100 mm) have remarkably higher properties compared to others (212 and 300 mm). Composites filled up to 30% WSD exhibits improved mechanical properties but the value dramatically decreased above 30% filler loading. The evidence of fiber-matrix interphase is analyzed using scanning electron microscope (SEM).

Pre-irradiation method was applied to graft acrylonitrile (AN) onto non-woven polyethylene film. Graft yield reached 130% at 70 kGy radiation dose, 60% monomer concentration and 4 h reaction time when H 2 SO 4 was used as an additive. The modification of AN grafted films with hydroxyl amine hydrochloride was done for the preparation of amidoxime adsorbent. The constructed adsorbent was characterized using FTIR, DMA and SEM. The amidoxime adsorbent was used for adsorption of Cu(II), Pb(II) and Cr(VI). Adsorption capacity was investigated under different conditions: contact time, pH and initial metal ion concentration. The optimum condition for maximum adsorption was found to be contact time 72 h and initial metal concentration 500 ppm for all the metal ions studied and pH 5.2 for Cu(II), 5.4 for Pb(II), 1.5 for Cr(VI). Kinetic adsorption data was elucidated using pseudo-first-order and pseudo-second-order equations. The equilibrium experimental data of metal adsorption matched Langmuir isotherm model. From the Langmuir equation, the monolayer saturation adsorption capacity (highest adsorption capacity) of the adsorbent was found to be 74.62 mg/g for Cu(II), 107 mg/g for Pb(II) and 156.25 mg/g for Cr(VI). The thermodynamics of metal adsorption was also investigated. Furthermore, desorption and reuse of the adsorbent film was studied. The results suggest that the adsorbent can be effective for adsorption of Cu(II), Pb(II) and Cr(VI).

In this study two commercial types of reinforced glass fibers were studied: chopped and 0/90 fiber glass composted with unsaturated polyester resin. The composites were prepared by hand lay-up method in three layers. The flexure properties were studied by using three-point bending test. The results showed that pure unsaturated polyester UPE is fractured when it reach the maximum point. Different behavior was shown for the fiber/polyester composite depending on the type of the fiber. The damage causes by the applied stress was appeared by photographs. In all samples the matrix cracking occur in the lower face of the specimen followed by fiber fracture due to the bending stress.

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