Plasma Modification of Graphite Fibers and Its Effect on Composite Properties.
Final rept. Sep 80-Jun 82,
TUFTS UNIV MEDFORD MASS
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A new method is explored to improve mechanical properties of carbongraphite CG fiber reinforced composites through chemical modification of the fiber surface. CG 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 CG 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 dynescm. Compared to unmodified fibers, plasma treated CG fiber resulted in substantial improvements in both interlaminar shear and flexural strengths when incorporated uniaxially in epoxy matrices.
- Laminates and Composite Materials