Influence of the stretching temperature on an alumina filled microporous high density polyethylene membrane

The effects of the stretching temperature on the properties of an alumina filled high density polyethylene (HDPE) membrane were investigated. As the stretching temperature increases up to 120 °C, the porosities of the alumina filled HDPE membrane were increased. The crystallinity of the microporous alumina filled HDPE membranes was increased steadily with an increasing stretching temperature up to 120 °C. The pores of the alumina filled HDPE film was easily formed at the interface between the alumina particles and HDPE, and the lamellae separation of HDPE was enhanced as the crystallinity of the alumina filled HDPE film was increased. The tensile strength at a stretching temperature of 80 °C was a little larger than those at a stretching temperature of 100 °C and 120 °C. The electrolyte uptake and the ionic conductivity were increased in proportion to the porosity. When the stretching temperature was 120 °C, the ionic conductivity of the microporous alumina filled HDPE membrane reached 4.56 × 10−3 S/cm.