Effect of Two Decades Aging on the Ultrasonic and Electrical Properties of Polymer Composite Materials

Abstract

The effect of aging, type and concentration of filler (Alumina trihydrate (ATH) and silica (SiO2)) on the mechanical and electrical properties of polyester composite as a high voltage insulating materials, were investigated by means of ultrasonic and electrical techniques. Ultrasonic wave velocities (both longitudinal and shear) were measured at frequencies of 4 MHz at room temperature. Results of density, ultrasonic wave velocities, mechanical properties and electrical loss showed the improvement of the polymer composite network with aging and type of filler. This behavior may be due to the change in cross-link density and average stretching force of bonds with aging.