Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Poster: Surface Reactions

O 35.2: Poster

Tuesday, March 19, 2024, 18:00–20:00, Poster C

Non-thermal plasma modification of unsized carbon fibers — •Torben Noah Gärtig, Viktor Udachin, and Wolfgang Maus-Friedrichs — Clausthal Center of Material Technology, Clausthal University of Technology, Clausthal-Zellerfeld, Germany

Bonding of carbon fibers to the resin matrix for carbon-fiber-reinforced polymers is mostly achieved with sizing materials. An alternative treatment by oxidizing fibers with a non-thermal dielectric barrier discharge (DBD) plasma in air or oxygen atmospheres may provide a more environmentally friendly approach, which can simplify recycling of fibers and exclude the usage of sizing substances. In the present study, unsized carbon fibers were plasma treated in air and oxygen atmospheres at 1000 hPa and 25 °C with treatment times up to 10 minutes. The fiber surface before and after treatment was analyzed with X-Ray Photoelectron spectroscopy as well as microscopic methods like atomic force microscopy (AFM) and confocal laser scanning microscopy (CLSM). The plasma was characterized with optical emission spectroscopy (OES). It was found that air DBD plasma under ideal power parameters can oxidize fibers better than oxygen DBD plasma due to nitrogen reactive species aiding ozone generation. The observed oxidation does not result in significant morphology changes.

Keywords: carbon fiber; plasma; XPS; AFM; Oxidation