title: [Research on enhanced photocatalytic degradation of medical PVC by plasma-initiated free radicals].
abstract: Effects of plasma-initiated free radicals on photocatalytic degradation of medical PVC with anatase TiO2 were studied. Surface properties of PVC were characterized by the contact angle, surface tension, X-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR). The results indicate that the surface free energy and wettability of plasma-treated PVC increase greatly. The contact angles of distilled water, glycerin and dihydroxyethylsulfide for the plasma-treated PVC decrease. ESR reveals radicals on the surface of the plasma-treated PVC film nearly increase ten times. Moreover, the photodegradation of the PVC-TiO2 was compared with that of plasma-treated PVC-TiO2 through performing weight loss monitoring, scanning electron microscopic (SEM) analysis. Weight-loss rate of the plasma-treated PVC-TiO2 increases 27.4% in comparison with that of PVC-TiO2 under UV irradiation for 60 hours. SEM of the plasma-treated PVC-TiO2 film shows a lot of crack on the surface after photodegradation. Plasma treatments aggravate the photocatalytic degradation of medical PVC.
authors.affiliation: State Key Laboratory of Mechanical Behavior of Materials, Xi' an Jiaotong University, Xi' an 710049, China. lixj@stu.xjtu.edu.cn
authors.forename: Xiao-jing
authors.initials: XJ
authors.lastname: Li
authors.forename: Guan-jun
authors.initials: GJ
authors.lastname: Qiao
authors.forename: Jie-rong
authors.initials: JR
authors.lastname: Chen
mesh_terms: D002384:Catalysis / Q000528:radiation effects; D004578:Electron Spin Resonance Spectroscopy; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology; D010777:Photochemistry / Q000379:methods; D011143:Polyvinyl Chloride / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: C009495:titanium dioxide; D011143:Polyvinyl Chloride; D014025:Titanium