Influence of Additives in Electret Nonwoven Fabric on Thermally Stimulated Current.

Abstract

Polypropylene fibers consist of a complicate higher-order structure and contain additives such as antioxidant, polar polymer and nucleating agent, hence, the origin of carrier traps is complicated. After carriers were trapped adequently into a nonwoven fabric by corona charging, the effect of additives was investigated by thermally stimulated current. As results, even a small amount of additives affected largely upon thermally stimulated current and enlarged the intensity of peak and the polarization charge. These phenomena may be the result of increase of physical and chemical traps formed by additives. The thermally stimulated current originated from trapped carriers and polarization of electret polypropylene fibers was found to closely concern with the molecular motion of polypropylene. Furthermore, the polarization charge increased by additives affected upon filter performance.

Research on Polypropylene Electret Melt-Blown Nonwoven Doped with Nano-Tourmaline

“…In an effort to improve the amount and stability of such electrostatic charges, the electret filter materials mixing with inorganic additive and polymeric additives were reported in the past. [8,9] In this paper, a novel kind of polypropylene electret melt-blown nonwovens was developed by using nano-tourmaline as additive by corona charging. Compared with common electret melt-blown nonwovens, the surface charge density (SCD) and the FE were both increased greatly.…”