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A Tritium–Hydrogen Exchange Procedure for Determining the Concentration of Exchangeable Sites on PAN Based Carbon Fibres

John N Hay

Brendan J Howlin

John R Jones

Shui-Yu Lu

Graham A Webb

Department of Chemistry, University of Surrey, Guildford GU2 5XH, UK

Michael G Bader

Department of Materials Science and Engineering, University of Surrey, Guildford GU2 5XH, UK

A non-destructive tritium–hydrogen exchange procedure has been developed in order to determine the concentration of exchangeable hydrogens on surfaces, and in this particular instance it has been used on carbon fibres. The results show that the concentrations of ‘active sites’ on the surfaces of Courtaulds Grafil XAS and XAU carbon fibres are 2.61 and 0.08 µmol g^–1 respectively. When the XAS fibres are subjected to a standard methylation procedure the concentration of exchangeable hydrogens is reduced to 0.79 µmol g^–1.On the other hand, when XAU fibres are subjected to oxidation in concentrated nitric acid, the concentration of exchangeable hydrogens is increased to 10.27 µmol g^–1.

High Performance Polymers, Vol. 9, No. 3, 281-290 (1997)
DOI: 10.1088/0954-0083/9/3/007


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