Study of the charge profile of thermally poled electrets
Document typeResearch report
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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.
CitationParsa, S.E., Trull, J., Colom, X., Sellarès, J. "Study of the charge profile of thermally poled electrets". 2016.
URL other repositoryhttps://arxiv.org/abs/1602.05377
- Departament de Física - Reports de recerca 
- POLQUITEX - Materials Polimérics i Química Téxtil - Reports de recerca 
- DONLL - Dinàmica no lineal, òptica no lineal i làsers - Reports de recerca 
- DILAB - Laboratori de física dels materials dielèctrics - Reports de recerca 
- Departament d'Enginyeria Química - Reports de recerca