Lipp-Terler

3 POLYETHERETHERKETONE, ViCTREX, LiTE K, EROM LiPP-TeRLER 

4 Polyetherimide, Molecular Mass 89 100, erom Lipp-Terler 

---

Fig. 5 Isothermal surface potential decay (ITPD) as a function of the annealing time at 90 °C of commercial films (50 pm thickness) of PPS, PES, and PEEK (all manufactured by Lipp-Terler, Austria). Films were corona charged for 15 s to +400 V [27]. Published by permission of WILEY-VCH...

In order to elucidate the effect of water absorption on the charge storage behavior of commercial Ultem 1000 films (50 pm thickness Lipp-Terler), samples with various water contents were prepared. The water content was determined by a weight gain method using a Mettler Toledo MX5 micro-balance with a resolution of 1 pg. The water content of as-received films was determined by Karl-Fischer analysis to 0.74 wt%, compared to an equilibrium water absorbance of PEI at 1.39 wt% [27, 74], As a preconditioning step, the specimens were dried under vacuum at 125 °C for 24 h to ensure a water content of less than 0.02%. By additional immersion treatments, the water content of these PEI films was increased to films with 0.45 wt% and 0.66 wt%. 

---