Investigation on the Physical and Mechanical Properties of Composites from Combined Recycled ONP-Glass Fibers with Polypropylene

In this research، recycled Old Newsprint (ONP) and glass fiber in mixture rates of 0-50 percent were mixed with Polypropylene (PP) at two levels of 60 and 50 percent (by weight). Physical and mechanical properties of resulted composites were determined. Results have shown that treatments No. 2 (10% glass fibers، 30% ONP and 60% PP) and No. 10 (40% ONP and 60% PP) had totally best physical and mechanical properties on the basis of normalization equation. In addition، the effect of maleic anhydride-Polypropylene coupling agent (MAPP) at two levels of 0 and 4 percent on the physical and mechanical properties of the composites in two optimum treatments was investigated. Results showed that the values of the modulus of elasticity in tension، modulus of rupture، modulus of elasticity in bending and toughness were increased while water absorption and thickness swelling decreased by addition of MAPP. In other words، using MAPP will improve the physical and mechanical properties of such composite.