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Ex-PAN carbon fibers (high strength, Celion G30-500, 3K-HTA-7C-N501, BASF Structural Materials, Inc.) were oxidized in 70% nitric acid at 115°C for various times and then reacted with tetraethylenepentamine (TEPA) at 190-200°C, thereby grafting TEPA to the fiber through amide bonds. To determine the resulting quantity of surface amino groups present, HCl uptake experiments were conducted. However,...
Amino groups react rapidly with both isocyanates and epoxides. Thus, to prepare carbon fibers which might exhibit enhanced adhesion to both polyurethanes and epoxy resin matrices, attempts were made to introduce a high surface amine concentration onto high-strength carbon fibers (derived from PAN) by nitric acid oxidation followed by reaction with excess tetraethylenepentamine (TEPA). Fibers were...
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