Dielectric Properties of Polymer Blends Using Least Square Method

Abstract

Poly vinyl chloride (PVC) is widely used in high and medium voltage cables insulation due to its low dielectric losses and its ability to improve cables properties in high temperatures. This paper aims to improve PVC electrical properties (dielectric strength) for high voltage and medium voltage cables in respect of mechanical characteristics by adding ethylene propylene diene monomer (EPDM). Blends of PVC with EPDM were prepared with 0%, 20%, 35%, 50%, 65%, 80%, and 100% by weight percentages concentration. The dielectric strength of the blends was tested in several conditions such as dry, wet and salty wet condition. Tensile strength test was applied to check mechanical properties of the blends. Results were analyzed using least square method in a way to determine the optimum percentage of mixing PVC/EPDM blend, which gives the best of electrical and mechanical properties under different conditions.