Effect of Various Temperature Environments on the Performance of PVC/ATH Composites as Insulating Material

摘要

Insulating materials should be heat and fire resistant within the specified limits without damaging other properties.In the present work,different samples of polyvinyl chloride (PVC) and PVC/ alumina trihydrate (ATH) composites have been prepared and exposed to various degrees of temperatures,which represent the variation of the temperature in the surrounding environment for outdoor purposes.The permittivity (epsilon') and dielectric loss (epsilon") over the frequency range from 100 Hz to 100 kHz and also the electrical resistivity (rho) have been investigated.The mechanical properties and the fire-retardant efficiency of the PVC and PVC/ATH composites have also been studied.It was found that the permittivity (epsilon') and dielectric loss (epsilon") increase slightly by increasing the ATH content up to 25 phr,after which an abrupt increase was noticed.The electrical resistivity (rho) was found to be 8.3 x 10~(10) and 3.1 x 10~(10) OMEGA centre dot cm for the samples containing 25 phr ATH filler at 25 and 70 deg C,respectively.The effect of various temperatures (5,25,and 70 deg C) on the mechanical properties has been evaluated for the different samples.Increasing the ATH content to 45 phr improves the compressive strength at room temperature and at 5 deg C.The investigations demonstrate that the rate of burning time and the density of smoke of PVC/ATH composites decrease as the concentration of ATH increase.