Preparation of porous PTFE/PE/PP composite electret and study of its charge storage stability

In this paper we introduced the preparing process and corona charging method of the porous PTFE/PE/PP composite electret film, and furthermore, studied its charge storage stability by using the method of isothermal surface potential decay measurement, open-circuit thermally stimulated discharge current spectra. It was shown that 1) charge storage stability for negative porous PTFE/PE/PP composite electret corona charged at high temperature was almost the same as that of porous PTFE electret charged at room temperature. 2) The charge storage stability of porous PTFE/PE/PP electret was closely related to the structure of porous PTFE and charging condition. 3) Porous PTFE/PE/PP electret exhibited higher charge storage stability than porous PTFE electret under high humidity.