Surface potential decay, isothermal

Fig. 2 Isothermal surface potential decay (ITPD) as a function of the annealing time at 90°C of films (60-80 pm thickness) compression molded using different commercial i-PP homopolymer grades Moplen HP522H (Basell), Borealis PP HD601CF and Borclean HB300BF (both Borealis)...

Fig. 17 Isothermal surface potential decay (ITPD) curves at 90°C for equal concentrations of 1 and 2 in i-PP films and of neat i-PP films. While compound 1 enhances the electret properties of i-PP films, compound 2 causes a fast decay of the charge...

Fig. 22 Isothermal surface potential decay at 90 °C of i-PP films containing 0.125 wt% of additive 4. The films were corona charged (filled circles) or charged with electrons of energies from 2 to 15 keV [41]. Published by permission of IOP Publishing Ltd...

Fig. 27 Isothermal surface potential decay (ITPD) curves of positively corona charged PPE/PS blends as a function of the annealing time at 90 °C. The weight compositions refer to the ratio of PPE/PS [45], Reprinted by permission of Elsevier Ltd...

Fig. 37 Chemical structure of PEI (identical for Ultem 1000 and 7a) and isothermal surface potential decay (ITPD) curves of compression molded and corona charged films of Ultem 1000 and 7a [68], Published by permission of Wiley Periodicals Inc...

Fig. 38 Chemical structure of Irgafos P-EPQ top) and isothermal surface potential decay (ITPD, bottom) curves of melt compounded, compression molded, and corona charged films of PEIpur additivated with 5,000 (filled diamonds), 3,200 (filledpentagons), 2,200 (filled triangles), 1,200 (filled circles), 700 (filled inverted triangles), and Oppm (filled hexagons) Irgafos P-EPQ. For comparison, the curve for commercial Ultem 1000 films (open squares) is also included [68]. Published by permission of Wiley Periodicals Inc...

Fig. 43 Isothermal surface potential decay (ITPD) curves as a function of time at Tywn = 120°C of compression-molded Ultem 1000 films aged at rage = 200°C...

Fig. 16. Isothermal surface potential decay curves for porous and solid PP films at room temperature (A, , negative charged, A,D,o positive charged).

In Eqs. 37 and 3S,fo (Es)N (E is the arbitrary distribution funetion of the activation energy Es for the occupied surface traps and cos is their frequency factor. It has been shown experimentally that the distribution function can be recovered from the isothermal surface potential decay data obtained at several different temperatures and plotted as t-(dV/dt) versus Ig t. 

The surface potential isothermal decay for the positive corona charge maintained initial potential in the porous film in the progress for 3h, but was the decrement of approximately 4% with both solid films. 

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