Accession Number : ADA136558

Title :   Plasma Modification of Graphite Fibers and Its Effect on Composite Properties.

Descriptive Note : Final rept. Sep 80-Jun 82,


Personal Author(s) : Dagli,G ; Sung,N H

PDF Url : ADA136558

Report Date : Aug 1983

Pagination or Media Count : 66

Abstract : A new method is explored to improve mechanical properties of carbon/graphite (C/G) fiber reinforced composites through chemical modification of the fiber surface. C/G fiber surface was altered by plasma polymerization of acrylonitrile. Modified surface was characterized with ESCA, FTIR, SEM, and wetting angle measurements, using a pyrolytic graphite block, as a model surface to C/G fiber. Acrylonitrile plasma treatment permanently changed the graphite surface to a more polar one with a crtical surface energy for wetting, gamma c, of 54 dynes/cm. Compared to unmodified fibers, plasma treated C/G fiber resulted in substantial improvements in both interlaminar shear and flexural strengths when incorporated uniaxially in epoxy matrices.

Descriptors :   *Fiber reinforced composites, *Acrylonitrile polymers, *Plasmas(Physics), *Mechanical properties, Graphite, Synthetic fibers, Coatings, Surfaces, Spectroscopy, Strength(Mechanics), Flexural properties

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE