Thermal Behaviour of Oriented and Un-oriented Polymer Blends from Metallocene Polypropylene

In this paper the effect of various polyethylenes (PE) as well as Ziegler-Natta polypropylene (ZNPP) on thermal behaviour of metallocene polypropylene (mPP) in the oriented and unoriented polymer blend fibres is presented. The DSC 7 apparatus (Perkin Elmer) for measurement of thermal properties of these fibres was used. The oriented and un-oriented mPP/PE blends and fibres are characterised by individual melting temperatures of both components with deviation of the basic thermal quantities in comparison with mPP and PE. The decrease of the total melting enthalpy of the blend indicates a partial compatibility of mPP and PE at a temperature above the melting point of the components at low concentration of PE. The mPP/ZNPP fibres are compatible polymer blends with one melting temperature in the range of melting temperature of mPP and ZNPP.