Effect of flyash addition on dielectric properties of polypropylene

Dielectric properties of flyash filled polypropylene have been measured at different frequencies, and temperatures ranging from ambient to 160 degrees C. It has been found that the dielectric constant of flyash filled and unf illed polypropylene decreases with increasing frequency up to 100 kHz. The dissipation factor of pure polypropylene decreases with increasing frequenc y. Dielectric constant of flyash filled polypropylene increases as compared to pure polypropylene. With increasing temperature, dielectric constant (e psilon') and dissipation factor (tan delta) of flyash filled and unfilled p olypropylene have been measured at all frequencies between 4-100 kHz. The b eta' peak position has been found to shift towards higher temperature side for flyash filled polypropylene with increase in frequency. It has also bee n found that incorporation of flyash in polypropylene shifts the alpha(c) p eak towards the higher temperature side.