Mechanical Material Behaviour of Olefin Elastomer Modified Polypropylene
Polypropylene modified with olefinic rubber has gained great significance in the automobile industry. The compounding process allows for a relatively easy adjustment of the material properties according to the demand ("tailor made properties"). With the development of highly effective metallocene catalysts, metallocene polymerized polyethylene (mPE) became available. Showing rubber-like behaviour, mPE may be used as a substitute for the conventional EPDM, modifying polypropylene.
In this work, the static and dynamic properties of PP modified with olefinic rubber are examined under variation of rubber type, rubber content and processing parameters in the compounding and injection moulding process. The results show the effectiveness of mPE as a toughening modifier. The influence of the octene content of the mPE appears to be greater than that of the molecular mass. In injection moulding flow speed and mass temperature have the greatest effect on the blend properties. The dynamic properties are evaluated with the hysteresis measurement method.
Also, a method for the correlation of the creep deformation under static and dynamic loading is introduced. With the developed procedure, few short-term dynamic tests yield the creep deformation under static load by means of extrapolation. Conversely, starting from a static creep experiment, the deformation under dynamic loading conditions can be approximated for different stress ratios.Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
hysteresis measurement, olefin elastomer, compounding, phase morphology
Institute / chair: Technische Fakultät der Universität Erlangen-Nürnberg
Technical consultant for expert services: Prof. Dr.-Ing. Dr. h.c. Gottfried W. Ehrenstein (Betreuer), Prof. Dr.-Ing. Ernst Schmachtenberg
Publication year: 2000
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de
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