Surface Modification of Fluororubber Using Atmospheric Pressure Dielectric Barrier Discharge (DBD)

Abstract

Fluoride rubber F2311 film, an alternating copolymer of CF2-CFCl (CTFE) and CH2-CF2 (VF2) components, was treated by atmospheric pressure dielectric barrier discharge (DBD) in air. The surface structure, topography and surface chemistry of the treated F2311 films were characterized by contact angle measurement, atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS), respectively. The experimental results showed that a short time air plasma treatment led to morphological wettability and chemical changes in the F2311 films. The surface hydrophilicity increased greatly after the plasma treatment, the static water contact angle decreased from 98.6 o to 32 o , and oxygen containing groups (CôO, O-C=O, etc. ) were introduced. Atomic force microscopy revealed that plasma produced by DBD etched F2311 films obviously The roughness of the samples increased remarkably with the formation of peaks and valleys on the treated surfaces The increased surface wettability may be correlated with both the introduction of hydrophilic groups due to air plasma oxidation of the surface and the change in surface morphology etched by DBD.

Effect of Dielectric Barrier Discharge (DBD) Treatment on the Dielectric Properties of Poly(vinylidene fluoride)(PVDF)-Based Copolymer

“…The peaks of C-O, C-CF, C-F, CF 2 /CFCl and CF 3 shift to lower binding energy, which indicates the reduction of strong electron-withdrawing groups. This may be caused by some positive defects due to the defluorination and dechlorination under high voltage [32,34]. From Figure 6c, the peaks for O 1s, F 1s and Cl 2p also shift to a lower binding energy.…”