Complex surface characterization of modified carbon fibers by means of spectroscopic and thermodynamic methods
The wish to optimize the interactions between carbon fiber surface and polymer matrix and the basic interest in the fundamentals of adhesion required fiber surface characterization by various physicochemical measuring methods. This paper discusses the results of different physico-chemical measuring methods, e.g. inverse gas chromatography and electrokinetic measurements, to estimate the acid-base surface properties of carbon fibers. The discussion has been focused on the changes in the Brønsted and Lewis acid-base properties after a surface treatment.
In addition, photoelectron spectroscopic investigations of carbon fibers, which show the elemental surface composition, are a successful tool to demonstrate the molecular reasons of the thermodynamic surface properties.
The combination of different physico-chemical and spectroscopic measuring methods allowed to get comprehensive knowledge of the fiber surface chemistry.
Key wordsAcid-base properties carbon fibers inverse gas chromatography streaming potential surface characterization surface modification XPS
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