Analysis of the Relationship between Processing Conditions-Fiber Orientation-Final Properties in Short Fiber Reinforced Polypropylene

Abstract

Within the general objective of analyzing and modeling the processability of polypropylene and of its short fiber composites, a comprehensive analysis of the relationship between processing conditions, fiber orientation distribution and final properties has been performed. This relationship was analyzed for injection molded plates and studied as a function of the position in the plate. Final properties analyzed were impact strength, and flexural and elasticity modulus. In all the samples tested an accurate analysis of the fiber orientation distribution was performed and the results were related to the mechanical properties measured. The complex relationship between processing conditions, fiber distribution and mechanical behavior has been described by statistical correlations. This approach represents a useful alternative to the modeling route to predict the processing behavior of semicrystalline polymers and of their composites.

Keywords

short fiber composites experimental design injection molding tensile modulus

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References

1. Carlsson, L. Editor, Composite Materials Series, Vol. 7, Thermoplastic Composite Materials, Chap. 4, Elsevier, 1991.

2. Modern Plastics Handbook, 1994.

3. Kager-Kocsis, J. Editor, Polypropylene. Structure, Blends and Composites, Vol. 3, Composites, Chapman & Hall, 1995.

4. Nielsen, L. and Landel R. Mechanical Properties of Polymers and Composites, Dekker, 1994.

5. Advani, S. Editor, Composite Materials Series. Vol. 10, Flow andRheology in Polymer Composites Manufacturing, Elsevier, 1994.

6. Tadmor Z. and Gogos, C. Principles of Polymer Processing, John Wiley & Sons, New York, 1979.

7. White, J. Principles of Polymer Engineering Rheology, John Wiley & Sons, New York, 1990.

8. Isayev, A. Editor, Modelling in Polymer Processing, Hanser, 1991.

9. Matsuoka, T. , Takabatake, J. , Inoue, Y. and Takahashi, H. Pol. Eng. and Sci., 16(3) 957-957, 1990.

10.

10. Agassant , Avenas , Sergent and Carreau . PolymerProcessing: Principles and Modeling, Hanser, Munich, 1991.

11.

11. Bay, R. and Tucker C. Polym. Compos., 4(13) 317-317, 1992.

12.

12. Leo, V. and Cuvelliez, Ch . Pol. Eng. Sci., 36(15) 1961-1971, 1996.

13.

13. Bayne, C. and Rubin,I. Practical Experimental Designs and Optimization Methods for Chemists, VCH Publishers, 1986.

14.

14. Montgomery, D. Design and Analysis of Experiments, 3ed, Wiley, New York, 1991.

15.

15, Barbosa, S. E. and Kenny, J. M. Work #339 (Session 3 l) SPEAntec 96, Indianapolis, May, 1996.

16.

16. Barbosa, S. E. and Kenny, J. M. "Effects of processing conditions on the impact strength of polypropylene and its short fiber composites," Submitted to Pol. Eng. and Sci.

17.

17. Ross, P. Taguchi Techniques for Quality Engineering, McGraw-Hill, 1988.

18.

18. Khoshooee, N. and Coates, P. D.

Proceedings of PPS-12.

427-428, Sorrento, Italy, May 1996.; Rosato and Rosato , Editor, Injection Molding Handbook. Van Nostrand Reinhold, New York, 1986.