Effect of low-power plasmas on carbon-fibre surfaces. Part 2. A comparison between low-and-high modulus PAN based fibres with pitch based carbon fibres. Technical report

Technical Report · Sun Oct 01 04:00:00 EDT 1989

OSTI ID:5469216

Jones, C; Sammann, E

A comparison of the effects of a variety of low power (<1W) plasmas (air, NH{sub 3} and N{sub 2}) on highly ordered pyrolytic graphite (HOPG), polyacrylonitrile (PAN)-based and pitch based carbon fibers has been studied using X-ray photoelectron spectroscopy. Grazing angle techniques have been used to probe only the first 12-15 A of the fiber surface. Plasma treatments were carried out in an in situ plasma cell which was attached to a PHI 5400 X-ray photoelectron spectrometer. This enabled the immediate effects of the plasma to be studied before the treated surface was exposed to air. The reactivity towards a particular plasma is shown to be largely dependent on the structure of the fiber surface. Air plasma proved much more reactive to the fiber surface than either nitrogen or ammonia plasma resulting in alcohol type groups being incorporated onto the basal planes and carboxyl groups onto the edge sites. Ammonia and nitrogen plasmas only attacked the edge sites with the formation of aliphatic and aromatic amines (C-NH{sub 2}) together with small number of immines (C=NH).

• Research Organization: National Center for Composite Materials Research, Urbana, IL (United States)
• OSTI ID: 5469216
• Report Number(s): AD-A-234079/2/XAB; CNN: N00014-86-K-0799
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360604* -- Materials-- Corrosion
Erosion
&amp; Degradation
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical &amp; Physicochemical Properties
AIR
ALCOHOLS
AMINES
AMMONIA
AROMATICS
AZINES
CARBON
CARBON FIBERS
CHEMICAL REACTIONS
CORROSION
CORROSION PRODUCTS
DECOMPOSITION
DIAZO COMPOUNDS
ELECTRON SPECTROSCOPY
ELEMENTS
EROSION
FIBERS
FLUIDS
GASES
GRAZING
HETEROCYCLIC COMPOUNDS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
NAPHTHOLS
NITROGEN
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PAN
PHENOLS
PHOTOELECTRON SPECTROSCOPY
PLASMA
PYRIDINES
PYROLYSIS
PYROLYTIC CARBON
SPECTROSCOPY
SURFACE PROPERTIES
SURFACES
THERMOCHEMICAL PROCESSES