Formation of the crystalline phase of high-density polyethylene in the presence of metal oxides under plastic deformation at high pressure

The formation of a crystalline phase of HDPE in its blends with various met al oxides after application of high-pressure plastic shear deformation was studied by differential scanning calorimetry. The melting of HDPE in the HD PE-metal oxide blends subjected to the high-pressure deformation is charact erized by two neighboring DSC peaks. The total specific enthalpy of HDPE me lting in the blends was as high as 200-270 J/g. Upon the repeated heating, the melting of HDPE in the tested samples shows only a single DSC peak, the specific enthalpy of HDPE melting being only slightly lower than that meas ured during the primary heating.