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Study of the charge profile of thermally poled electrets

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hdl:2117/101794

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Parsa, Seyedeh Elaheh
Trull Silvestre, José FranciscoMés informacióMés informacióMés informació
Colom Fajula, XavierMés informacióMés informacióMés informació
Sellarès González, JordiMés informacióMés informacióMés informació
Document typeResearch report
Defense date2016-02-17
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
The charge profile of thermally poled electrets has been studied using two different methods, laser induced pressure pulse (LIPP) and pulsed electroacoustic (PEA), to gain insight into the mechanisms that are activated and assess which is the most appropriate method to study the charge profile. Disc–shaped PET samples have been conventionally poled to activate both the a and the ¿ relaxation and, right after, partially discharged up to a temperature Tpd . In this way, samples with a different combination of dipolar and space charge polarization have been obtained. Both LIPP and PEA reveal asymmetric profiles for Tpd below the glass transition temperature, that progressively become antisymmetric for higher temperatures. The shape and evolution of the charge profiles can be explained assuming injection of negative carriers from the anode that enhances the trapping of positive carriers near this electrode. It can be observed that PEA is able to detect a wider variety of polarization mechanisms in the system while LIPP gives a simpler picture of the charge profile.
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CitationParsa, S.E., Trull, J., Colom, X., Sellarès, J. "Study of the charge profile of thermally poled electrets". 2016. 
URIhttp://hdl.handle.net/2117/101794
URL other repositoryhttps://arxiv.org/abs/1602.05377
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