Perfluoropolyether-based organic-inorganic hybrid coatings:Preparation and surface characterisation

摘要

Hydrophobic-oleophobic coatings were prepared by using the sol-gel process with organic-inorganic hybrids based on perfluoropolyether-polycaprolactone(PFPE-PCL)copolymers.Hybrid coatings were prepared by changing the organic-inorganic ratio,the PFPE/PCL ratio in the copolymer,and the reaction conditions.A complete surface characterisation was carried out by contact angle analysis and x-ray photoemission spectroscopy(XPS).In all cases the wettability of the coatings was found to be very low.Surface composition analysis showed that the surface segregation of the fluo-rinated PFPE segments was always high enough to give a very high hydrophobic character to the coating surface.