Investigation on charge transportation in EPDM at different pressures

EPDM, as a high-quality insulation material, is widely used in cable joints, but it bears a large compression force in the working environment, which may affect its insulation performance. We study the effect of pressure on charge transport in EPDM by calculating the change in the key parameter of carrier mobility in EPDM at different pressures. In this paper, by designing a unipolar carrier blocking experiment and combining improved PEA measurement equipment, the mobility of electrons in EPDM at six pressures of 0.2 MPa-1.2 MPa (interval 0.2 MPa) is calculated. In addition, the mobility data is analyzed in-depth through the hopping conduction model. It was found that the mobility in EPDM at different pressures did not change significantly, and the electronic transition distance and energy required for hopping after fitting the hopping conduction model also did not change much under different pressures. It is indicated that under normal working conditions, pressures will not affect the electrical performance of EPDM.