Vacuum plasma treatment and coating of fluoropolymer webs - challenges and applications
The copolymer ethylene tetrafluoroethylene (ETFE) combines the favorable properties of both ethylene: good processing behavior like hydrocarbon polymers and tetrafluoroethylene: superior weathering stability, chemical resistance and thermal stability , . It has a high optical transmittance from ultra violet to near infrared wavelength range. ETFE is used in architecture, e.g. membrane roofs or facades in stadiums, shopping malls and airports, and photovoltaic modules as front-side encapsulation . However, thin film deposition on fluoropolymer webs faces several critical challenges because of poor mechanical and thermo-mechanical properties, inferior surface quality with respect to roughness, surface energy, and low adhesion of coated layers.