Abstract
The development of metallocene catalyst systems has led to numerous new materials. An important group of polymers, which is synthesized with these catalysts, is metallocene polyethylene (mPE). This material has a very homogeneous copolymer distribution and a narrow molecular weight distribution. In particular, very low density mPE possesses elastomeric properties superior to commonly used PE grades. In addition to the elastomeric behavior, mPE shows good dispersion in polypropylene (PP). Taking into consideration that PP exhibits low fracture toughness at low temperatures, it is often blended with an elastomeric material. Thus, it is better to use mPE as a modifier for PP. In similar applications, mPE can also be used as a substitute for the ethylene propylene diene terpolymer (EPDM) in PP/EPDM-blends. This chapter discusses the deformation behavior of PP/mPE-blends under static and dynamic loading. Dynamic load limits of the blend, which are necessary for several applications, are obtained using the hysteresis measurement method. This method is used to examine the influence of the mPE grade on different mechanical properties.
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