Study on the Effect of Process and Materials on Tensile Strength of the WGRT and Polypropylene Injection Molded Parts

Document Type : Persian


1 M.Sc. Student, Manufacturing and Production Engineering ,Islamic Azad University, Dezfoul Branch

2 Assistant Professor, Faculty of Engineering, Urmia University

3 Assistant Professor, Mechanical Engineering, Graduated School Faculty, Islamic Azad University-l Branch


This study experimentally investigates the effect of processing parameters on mechanical properties of injection molded copolymer. This paper presents an experimental study on the effects of processing parameters including melt temperature, injection pressure and amount preliminary materials on tensile strength of injection molded copolymer PP-WGRT. Polypropylene (PP - supplied by T.P.C of Iran) was used as thermoplastic material. Semi-crystalline material, Maleic anhydride-grafted (MA-g) used as agent cross-linked. Also, melt temperature was changed between 180 to 220 (˚C) and injection pressure was changed between 400 to 800 Bars. The tensile properties of produced parts were measured according to ASTM D 638 – 02. Results showed that tensile strength of copolymer decreases if the amount of WGRT increases. Also, the tensile strength increases by increasing the melting temperature and injection pressure.


1[ کرافورد، رابرت جیمز،مهندسی پلاستیک، ترجمه کوکبی، مهرداد، مرکز نشر آثار علمی؛ 1377، صص30-8 .
[2]  Park C.B., The Role Of Polymer/Gas Solutions In Continuous Processing Of microcellular Polymers, Ph.D. thesis, Mech. Eng. Department, MIT, 1993.
[3]  Phadke A.A; Bhattacharya, A.K.; Chakraborty, S.K; De S.K. Rubber Chemistry and Technology, 1983, Vol. 56, p. 726.
[4]  Avarami. Isayam , Recycling of rubbers , Institute of Polymer Engineering, The University of Akron , Akron, Ohio, 2010.
[5]  K.L. Fung, Robert K.Y. Li, A study on the fracture characteristics of rubber toughened poly(ethylene terephthalate) blends , Department of Physics and Materials Science, City University of Hong Kong,Polymer Tasting , Vol. 24, 2005, pp. 863-872.
[6]  R. Sonnier, E. Leroy, L. Clerc, A. Bergeret, J.M. Lopez-Cuesta, Polyethylene/ground tyre rubber blends: Influence of particle morphology and oxidation on mechanical properties, Ecole des Mines d’Ale`s, Centre des Mate´riaux de Grande Diffusion, Polymer Tasting, Vol. 26, 2007, pp. 274-281.
[7]  D. Y. Wu , S. Bateman, M. Partlett, Ground rubber / acrylonitrile – butadiene – styrene composites, CSIRO Manufacturing and Infrastructure Technology, Melbourne, Composites Science and Technology, Vol. 67, 2007,  pp. 1909-1919.
[8]  M. Awang, H. Ismail , Preparation and characterization of polypropylene/waste tyre dust blends with addition of DCP and HVA-2 (PP/WTDP-HVA2), Universiti Sains Malaysia , Polymer Tasting, Vol. 27 ,2008, pp. 321-329.
[9]  R. Sonnier, E. Leroy, L. Clerc, A. Bergeret, J.-M. Lopez-Cuesta, A.-S. Bretelle, P. Ienny, Compatibilizing thermoplastic/ground tyre rubber powder blends: Efficiency and limits , Centre des Mate´riaux de Grande Diffusion , Polymer Tasting, Vol. 27, 2008, pp. 901-907.
[10]             S. L. Zhang, Z. X. Xin, Z. X. Zhang, J. K. Kim, Study of microcellular injection-molded polypropylene/waste ground rubber tire powder blend , Qingdao University of Science and Technology, Materials and Design, Vol. 31, 2010, pp. 589-593.
[11]       B.Adhikari, D. De, S. Maiti, Reclamation and recycling of waste rubber,Prog., Polym. Sci, Vol. 25, 2000, pp. 909-948.