Electret properties of polypropylene fabrics

Results of investigations on electret properties of polypropylene (PP) fabrics formed by high voltage corona are presented here. The equivalent voltage of samples was measured in function of temperature that was increasing linearly in time. The half decay temperature and lifetime of stored charges were estimated. The filtration index of PP fabrics in function of surface charge was investigated. The pictures of the structure of PP fabrics using scanning electron microscope were also shown.