PLASMA-POLYMERIZED TETRAFLUOROETHYLENE COATINGS ON SILICA PARTICLES BY ATMOSPHERIC-PRESSURE GLOW-DISCHARGE

This paper presents a method of novel plasma treatment for fine partic les by the atmospheric-pressure glow (APG) discharge, in which particl es were circulated and repeatedly plasma-treated at atmospheric pressu re. Using this method, plasma-polymerized tetrafluoroethylene (TFE) fi lm formations on the porous granulated silica particles of 152 mu m me an diameter were investigated. The XPS C(1s) spectrum of the treated s urfaces deconvoluted into five peaks, which indicates that the films o n the particles were composed of highly branched and crosslinked fluor o-carbon segments. The film-coated particles were very hydrophobic. So und absorption measurements showed that the film-coated particles had a larger elastic coefficient than that of the untreated particles, ind icating that dense films were coated on the porous silica particles.