Research of the mechanism of influence of plasma processing on the properties of low modulus carbon fibers

1Gusarova, IA, 2Man'ko, TA, 1Romenska, ОP, 1Litot, OV
1Yangel Yuzhnoye State Design Office, Dnipro, Ukraine
2Oles Honchar National University of Dnipropetrovsk, Dnipropetrovsk, Ukraine
Space Sci. & Technol. 2020, 26 ;(1):90-99
Publication Language: Russian
The mechanism of influence of high-energy plasma flows on the properties of low modulus carbon fibers is studied. Plasma treatment is a promising direction for increasing the adhesion of carbon fiber to an epoxy matrix and the strength of composite materials. We present the technology for processing of the traditional carbon fiber with the plasma of the dielectric barrier discharge, where air acts as a plasma-forming gas. The activation of the plasma-forming gas and its saturation with functional groups was proposed to be carried out with the addition of chemical precursors — acrylic acid and allylamine. The purpose of using chemical precursors is to create functional groups ОН, COOH, C = O, C-O-C, -O-O-, NH2, N, and others on the surface of carbon fiber. These groups are responsible for the ability of the material to crosslink with the epoxy matrix.
              The results of studies of the surface layer of traditional carbon and atmospheric plasma-processed fibers by X-ray photoelectron spectroscopy, infrared spectroscopy, Raman spectroscopy, and electron microscopic analysis are presented. The obtained results and their assessment are given.
             The data on the surface composition of low-modular carbon fibers made it possible to assess the expediency of using the atmospheric plasma treatment to activate the surface of the filler (carbon fibers) and adsorb on it the active functional groups responsible for adhesive strength.
Keywords: infrared spectroscopy, low modulus carbon fiber, plasma treatment, X-ray electron spectroscopy
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