Accession Number : ADA301983

Title :   Immobilization of Amines at Carbon Fiber Surfaces: Relevance to Adhesion in Carbon Fiber-Epoxy Composite Material.

Descriptive Note : Technical rept.,

Corporate Author : WYOMING UNIV LARAMIE DEPT OF CHEMISTRY

Personal Author(s) : Peng, Jimmy C. ; Buttry, Daniel A.

PDF Url : ADA301983

Report Date : 29 JUL 1995

Pagination or Media Count : 31

Abstract : The reaction between amines acting as nucleophiles and the C-C bonds on the carbon fiber surface acting as electrophilic vinyl groups has not yet been explored. In this contribution it is demonstrated that both thermal reactions and electrochemical oxidation of amines at carbon fibers allow the covalent bonding of these molecules directly to the carbon fiber surface, presumably via nucleophilic attack of the amine at electrophilic C-C sites at the surface and subsequent formation of C-N bonds between the surface and the amine. A novel strategy for a quantitative assay of the number of amines attached to the surface is developed in which Fe(CN)6(3-) is electrostatically bound to the protonated, cationic amine sites, followed by electrochemical determination of the amount of bound Fe(CN)6 (3-) as a function of its concentration in solution. Analysis of the isotherm for this electrostatic binding process then provides the number of interfacially immobilized amines. The composition of the amine layer is also probed using X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared attenuated total reflection spectroscopy (FTIR-ATR). jg p.3

Descriptors :   *ADHESION, *CARBON FIBERS, *SURFACES, *AMINES, *EPOXY COMPOSITES, THERMAL PROPERTIES, FOURIER TRANSFORMATION, CATIONS, SPECTROSCOPY, LAYERS, MOLECULES, COVALENT BONDS, SITES, ELECTROCHEMISTRY, REFLECTION, CHEMICAL BONDS, OXIDATION, X RAY PHOTOELECTRON SPECTROSCOPY, RESTRAINT, BONDING, ASSAYING, ELECTROSTATICS, INFRARED SPECTRA, VINYL RADICALS.

Subject Categories : Organic Chemistry
      Refractory Fibers
      Laminates and Composite Materials
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE