Surface characterization of intermediate modulus graphite fibers via surface free energy measurement and esca
✍ Scribed by David Chan; Maria A. Hozbor; Erdal Bayramli; Robert L. Powell
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 764 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0008-6223
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✦ Synopsis
Electron spectroscopy for chemical analysis (ESCA), combined with surface derivatization and contact-angle measurements on single fibers, is used to characterize the surface of intermediate modulus (280 GPa tensile modulus) graphite fibers. Selective surface derivatization of the -COH, -COOH and -C=O functional groups with fluorine-enriched tag molecules is used to obtain a quantitative measure of their surface abundance. Quantitative information on the abundance of these functional groups is then correlated with the total and the acid-base free energy data obtained from contact-angle measurements. The three techniques provide complementary information, more completely characterizing the surface acidity of the fiber than any one of the techniques alone.