SF6, O-2, air glow discharge improve the electret property of biaxially oriented polypropylene film

SF6O2, air cold plasma are used for surface modification of the biaxially oriented polypropylene(BOPP) films. The effect of surface grafting on electret property is investigated. Surface potential is characterized as a parameter to evalue charge storage capacity, and half value temperature(T-1/2) of thermal stimulated charge decay(TSCD) is an indicator of charge storage stability. The experiment result show that surface grafting increase the charge storage capacity 50% and T-1/2 raise 25 degrees C. IR spectrum gives some detail information about the chemical structure change taking place during treatment, especially introduction of polar groups C=O,C-F etc. Finally the relationship between chemical component and trap density and modification effect are discussed.