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Morphology-Charge Storage Relationships in Polymer Electrets

The capability of polymer electrets to store electrical charges for a long time makes them attractive for a number of electroactive applications. While it is known that physical characteristics of polymers influence their charge storage performance, the literature lacks systematic studies between polymer morphology and electret properties. This work studied the influence of polymer morphology on their charge retention properties. Moreover, scientific effort was directed to improve electret properties by controlling the polymer morphology.

After evaluating the charge storage performance of several high-temperature polymer films, poly(2,6-dimethyl-1,4-phenylene ether) (PPE) was selected as the base polymer for most of this study. Subsequently, it was demonstrated that good electret performance of neat PPE could be enhanced by adding suitable weight fractions of polystyrene (PS). It was revealed that heterogeneities in the matrix and heightened polymer density were responsible for the enhanced charge storage ability of the polymer blends.

Because blending increases the heterogeneity of the polymer morphology, it was of interest to study the charge storage retention of ternary blends based on PPE. This study found that the charge storage capability was enhanced by a finely dispersed and non-interconnected phase but was reduced when the blended components were of high polarity or low molecular weight. Additionally, aged PPE was able to retain 45 % more charge than non-aged PPE. This effect is due to thermal treatment reducing the free volume and increasing the molecular packing density, which hinders charge drift resulting in higher charge storage.

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Author
 Deliani Lovera

Deliani Lovera
Lehrstuhl für Polymere Werkstoffe
Universität Bayreuth

Information

Free keywords: Electrets, morphology, charge storage, polymer blends, polyphenylene ether
Institute / chair: Fakultät für Angewandte Naturwissenschaften der Universität Bayreuth
Language: English
Technical consultant for expert services: Prof. Dr.-Ing. Volker Altstädt (Betreuer), Prof. Dr. rer. nat. Hans-Werner Schmidt
Publication year: 2009
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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