ON SOME DIELECTRIC-PROPERTIES OF PEN

Since poly (ethylene naphtalene-2,6-dicarboxylate) (PEN) gives high pe rformance films with key properties superior to those of PET polyester films, it has been argued that it could be used as a substitute for t he latter in a large number of applications. In this paper more inform ation on the electrical properties of this material are given and comp ared to those of PET. These properties, i.e. complex permittivity and breakdown voltage, are investigated under controlled and uncontrolled environments and before and after thermal ageing at a temperature 60 d egrees C higher than the thermal rating of each material.