Tuning of poly(ethylene terephtalate)(PET)surface properties by oxygen plasma treatmentDoliška, Aleš (Avtor) Kolar, Metod (Avtor) , Inštitut za kovinske materiale in tehnologije (Lastnik avtorskih pravic) poly(ethylene terephtalante)PEToxygen plasmacontact anglehydrophilicfunctionalizationModification of surface properties of poly(ethyleneterephtalate) (PET) thin films by treatment with weakly ionized oxygen plasma was studied by contact angles of water and diiodomethane (DIM) drops. Samples were exposed to oxygen plasma with the ion density of 5 x 1015/m[sup]3 and the neutral oxygen atom density of 3 x 1021/m[sup]3. Just after the treatment they were characterized by contact angle measurements. Results showed a quick decrease of the water contact angle in the first few seconds of plasma treatment, while prolonged treatment did not cause any substantiated modification. The contact angles of DIM, on the other hand, remained rather constant for the first several secondsof plasma treatment, and increased after prolonged treatment. It was found that the dispersion component of the surface free energy decreased with increasing treatment time, while the polar component increased with treatment time. The results were explained by surface functionalization as well as by roughness effects.20112012-06-01 10:25:37Znanstveno delo27287ISSN: 1580-2949UDK: 678:541OceCobissID: 106193664COBISS_ID: 861098ISSN pri članku: 1580-2949NUK URN: URN:SI:UM:DK:PYEBDSIOsl