POLARIZATION AND CONDUCTION PROCESSES OF PEN FILM UNDER THERMO - ELECTRICAL STRESSES

Abstract

Alternate polarization current (APC) measurements, conduction current at high electrical field and electroluminescence (EL) measurements were carried out on poly(ethylene naphthalene 2,6-dicarboxylate) (PEN), a polar polyester. The aim to develop and understanding of the polarization and conduction processes at play in this material under thermo-electrical stresses. When polarizing at low field and at low temperature, linear current-time curves were observed in logarithm scale, so dominant polarization process associated. However, results observed at high field or/and high temperature shown non-linear characteristics, so polarization and conduction processes associated. For the EL measurements, a threshold field was determined at environ from 210 to 240kV/mm for all temperatures. From this field, the EL signal observed was interpreted as deriving from recombination of opposite sign charges.