The influence microwave (2.4 GHz) plasma treatment duration (under reduced pressure of air or argon 1-2 Torr) on the surface properties of various carbon fibres (M 40, T 300 (Toray)) has been investigated. The dispersive ( gamma S D ) and polar ( gamma S P ) component of their surface energy were determined by a micro-gravimetric indirect method of wetting contact angle measurements within two liquids. Even for very short treatment durations (2-5 s) important increases in gamma S P up to 20-30 mJm -2 are obtained (under air and under argon) while gamma S D display an opposite evolution. The changes in surface topography as revealed by SEM were also considered.
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Donnet et al. (1987) studied this question.
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