Abstract
The development of surface acidity on Amoco T300 fibers during mild electrochemical oxidation was investigated. Selective neutralization and ESCA were the primary tools used to investigate fiber-surface functionality. The standard selective neutralization technique was modified to use a conductometric back titration. The conductometric titration is necessary to measure the surface acidity of the mildly treated fibers. Thallium derivatization coupled with ESCA analysis was used to obtain an independent measure of surface acidity. Incipient surface treatment of untreated Amoco T300 carbon fibers results in significant oxidation but produces little surface acidity. As oxidation proceeds, however, more of the oxygen placed on the surface is in an acidic form. The onset of prominent surface acidification during electrochemical treatment is accompanied by surface degradation. Commercially surface-treated fibers are sparingly oxidized and have little surface acidity. Fibers from various manufacturers do have significant differences in their surface chemistries.
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