The effect of changing injection temperature on some mechanical and morphological properties for polypropylene material (PP)


This is a study of a medical injection factory-Babylon carried out in order to achieve proper mechanical and morphological properties, PP has been injection molded by using cold runner injection molding machine with temperature variation (198, 200, 203……220°C) for ten samples. The physical and mechanical properties of PP product were examined. It has been found that the Shore hardness decreases linearly with injection molding temperature increasing. The tensile strength has a similar behavior to the hardness. However, it has been found that the MIF (Melt Index Flow) rates increases with the increase of injection molding temperature. The density of PP has been found for both virgin PP and the samples, it has been found that the density decreases with increasing operation temperature. FTIR (Fourier Transmission Infrared) spectra were taken for both samples with high and low operation temperature. Besides the SEM (Scanning Electronic Microscopy) test shows the difference in the morphology of the product surface and the PP product at high and low operation temperature. Moreover, for all these properties, the PP product exhibits good mechanical properties (hardness, tensile strength, density) for the samples produced at temperature lower than 207°C. While the physical properties such as MIF improved with injection temperature increasing, additionally, the SEM images show that the sample produced in low temperature have surface damage.

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  • Al-Zubiedy, A., Kreem, N., 2013. Studying the effect of injection pressure on some mechanical properties for polypropylene material (PP), International journal of multidisciplinary research (IJMR), Jai Hind Education Society, II(6), 09.

  • Bahrololoom, M. E., Younesi M., 2009. Effect of temperature and pressure o pressing on mechanical properties of PP-HA bio-composite, Material and design, 30, 3482-3488.

  • Charles A. Harper., 2006. Handbook of plastic technologies”, technology seminars, Inc. Maryland, Edition in chief.

  • Crawford, R.J., 1987. Plastic engineering, The Queen’s University of Belfast, 2nd Edition.

  • Crawford, R.J., 1998. Plastic engineering, The Queen’s University of Belfast, 3rd Edition.

  • Flizikowski, J., Al-Zubiedy, A., 2000. Effect of the injection moulding parameters of toothed wheels and type of polyamide material on the kinematic gear ratio of a belt transmission with these wheels, 14th ICCPE, Praga.

  • H. Li., 1998. Rheological Behavior of Vinyl Ester Resins, chapter three.

  • Hattotuwa, G., Premalal, B., Ismail, H., Baharin, A., 2002. Comparison of the mechanical properties of rice husk powder filled polypropylene composites with talc filled polypropylene composite Polymer Testing, 21, 833-839

  • Jaruga, T., Bociga E., 2007. Structure of polypropylene parts result from multicavity injection mold, Journal of Archives of materials Science and Engineering, 28(7), 429-432.

  • Koszkul, J, Suberlak, O., 2001, Physical chemistry and polymer properties base, Czestochowa University of Technology Edition, (in Polish).

  • Kwiatkowski, D., Nabiałek, J., Postawa, P., 2006. Influence of injection moulding parameters on resistance for cracking on example of PP, Journal of Achievements in Materials and Manufacturing Engineering, 17, 1-2.

  • Manas Canada & Salil K. Roy., 2007. Plastic Technology Handbook, 4th Edition, CRC Press, United states of America.

  • Nairn, J.A., 2001. Fracture mechanics of composites with residual stresses, imperfect interfaces, and traction-loaded cracks. Composites Science and Technology, 61, 2159-2167.

  • Peter Jones, 2008. The Mould Design Guide, Shawbury, Shrewsbury, Shrop-shire, SY4, 4NR, United Kingdom.

  • Rahim, N.A.A., Ariff, Z.M., Ariffin, A. and Jikan, S. S., 2011. A study on the effect of filler loading on flow and viscoelastic behavior of polypropylene/kaolin composites, J. Appl. Polym. Sci., 119, 73-83.

  • Senol, S., Pasa, Y., 2005. Effects of testing parameters on the mechanical properties of polypropylene random copolymer, Polymer Testing, 24 613–619.

  • Sikora, R., Flizikowski, J., Al-Zubiedy, A., 1993. Effect of injection moulding parameters of toothed wheels and type of polyamide material on the kinematic gear ratio of a belt transmission with these wheels. International Polymer Science and Technology, 20(4).

  • Strong, A. Brent, 2000. Plastics material and processing, 2nd Edition, Prentice Hall, Upper Saddel River, New Jersy, Columbus Ohio.


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