Preparation and Microwave Dielectric Properties of Polyethylene/TiO2 Composites

Rutile-phased TiO 2 -filled polyethylene (PE/TiO 2 ) composites with dielectric constant ( ε r ) ranging from 3.2 to 10.45 have been prepared by melt-mixing method and hot-molding techniques. The dielectric constant and dielectric loss (tan δ ) of PE/TiO 2 composites show an increasing trend, whereas the relative density, coefficient of thermal expansion and tensile strength showed a monotonically descending trend with increasing the rutile-phased TiO 2 contents. A comparison of experimental and theoretical results shows large deviation at high filler contents. The prepared rutile-phased TiO 2 -filled PE composites were well suited for microwave application, especially for its ultra-low loss tangent (