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All treatments gave rise to more hydrophilic materials, as indicated by a decrease in the water contact angle. The GM and OW methods both showed that the polar component of the SFE increased after bleaching or conventional chemical treatment and, in particular, after plasma treatment. The vOGC method showed much smaller effects and indicated decreasing polarity after plasma treatment. This was probably due to the use of acid and base probes that did not contain hydroxyl groups in the determination of vOGC parameters, that is, the effect of the treatments was to introduce acid functionalities that could interact strongly with hydroxyls (hydrogen bonding) but not with the Lewis base THF or Lewis acid CF.
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