Behrendt, N. and Mohmeyer, N. and Hillenbrand, J. and Klaiber, M. and Zhang, X. and Sessler, Gerhard M. and Schmidt, H.-W. and Altstädt, V. (2006):
Charge storage behavior of isotropic and biaxially-oriented polypropylene films containing alpha- and beta-nucleating agents.
99, In: Journal of Applied Polymer science, (3), Wiley-Blackwell, pp. 650-658, ISSN 1097-4628, [Online-Edition: https://onlinelibrary.wiley.com/doi/epdf/10.1002/app.22502],
[Article]

Abstract

A study on the influence of the crystal mod- ification ( ␣ and ␤ ) of isotactic polypropylene (i-PP) films on the resulting electret properties is presented. Two commer- cial nucleating agents, sodium 2,2⬘-methylene-bis(4,6-di-tert- butylphenyl)-phosphate (NA11) and N,N⬘-dicyclo-hexyl- 2,6-naphthalene-dicarbox-amide (NU100), were employed in this investigation. Isothermal charge decay was measured at 90°C. In hot pressed isotropic polypropylene films, no significant differences in the charge storage properties were observed for ␣ - and ␤ -nucleated specimens. In addition, the article presents the influence of the nucleating agents at different concentrations on the PP-film morphology of bi- axially stretched films with respect to electret features. It was possible to prepare elongated cavities with the virtually insoluble NA11 additive during stretching, even at concen- trations below 0.3 wt %. These films displayed slightly im- proved electret properties in comparison to stretched neat PP films due to generated cavities acting as barriers for the drift of charges. Various draw ratios were also studied for i-PP films with 0.15 wt % NA11.

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