Immobilization of Amines at Carbon Fiber Surfaces: Relevance to Adhesion in Carbon Fiber-Epoxy Composite Material.
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
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 29, 1995
- Accession Number
- ADA301983
Entities
People
- Daniel A. Buttry
- Jimmy C. Peng
Organizations
- University of Wyoming