Recupera？？o hidrofóbica de polipropileno tratado por VUV ou plasma

surface treatments using plasma and vacuum ultraviolet radiation (vuv) were used to introduce oxygen-containing functional groups in samples of polypropylene, in order to modify its wettability. atr-ftir, afm and contact angle (ca) measurements were used to analyze the chemical and physical changes on the pp surface as a function of time. the results showed changes in wettability of the vuv-treated samples mainly due to chemical modification of the surfaces. for plasma-treated samples, aging occurred faster than for the vuv-treated ones. for both treatments, a rearrangement of the polymer chains during aging has probably occurred, with possible crosslinking of surface macromolecules for the vuv-treated samples.