It is known that the heat treatment process in the production of extruded cables, affects the electrical properties of polymeric insulation materials; this effect is via two main phenomena; first, it leads to diffusion and removal of polar substances from the system; second, it affects the polymer morphology by increasing the polymer chain relaxation and creation of crystallites, hence increasing the crystallinity of the material. In this study, thick pressed samples with additive free low density polyethylene (LDPE) insulation material were heat treated at different conditions for different periods of times. Differential scanning calorimetry (DSC) measurements confirmed that heat treatment leads to higher crystallinity and higher lamella thickness in LDPE. Dielectric properties of the material was studied by conduction current measurement and dielectric spectroscopy. Conduction current of samples with different heat treatment times was measured at high electric fields which shows that the conduction current of LDPE is affected by heat treatment. Generally, the apparent conductivity decreases by heat treatment. Dielectric spectroscopy measurements show that heat treatment does not have a significant effect on real and imaginary permittivity of the polymer. Interestingly, an increase in the sample thickness via heat treatment, was observed both by sample thickness related to the memory effects in the polymer which needs to be taken into consideration for accurate capacitance measurements.
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