Surface modification of poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether) (PFA) with vacuum UV (VUV) photo-oxidation using radiation from excited Ar atoms downstream from an Ar microwave (MW) plasma shows: (1) an improvement in wettability as observed by water contactangle measurements; (2) surface roughening; (3) incorporation of oxygen as C=O, CF—O—CF2 and CF2—O—CF2 moieties and (4) enhancement of the CF—O—C n F2n+1 concentration. Adhesion measurements of Cu sputter coated onto the photo-oxidized PFA surface results in failure within the PFA (cohesive failure) and not at the Cu–PFA interface.
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Dasilva et al. (2006) studied this question.
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