Abstract
Differential scanning calorimetry is employed to study thermal effects that are observed after plastic deformation of PP under pressures of 0.5–3.0 GPa. Thermograms demonstrate an exothermic peak at 149°C, which is related to cold crystallization, and an endothermic peak at 162°C, corresponding to melting. The enthalpies of phase transitions depend on pressure and the degree of deformation specified by the rotation angle of anvils. Pressure treatment is conducted with grounded and insulated anvils. The UV irradiation of samples treated under pressure diminishes the enthalpy of both thermal processes.
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