Space charge and dipolar contributions from amorphous and crystalline phases in ferroelectric polymers

Neagu, RM; Marat-Mendes, JN; Neagu, ER; Pissis, P

dc.contributor.author	Neagu, RM	en
dc.contributor.author	Marat-Mendes, JN	en
dc.contributor.author	Neagu, ER	en
dc.contributor.author	Pissis, P	en
dc.date.accessioned	2014-03-01T02:42:20Z
dc.date.available	2014-03-01T02:42:20Z
dc.date.issued	2003	en
dc.identifier.issn	0015-0193	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30954
dc.subject	Curie transition	en
dc.subject	Dielectric relaxation	en
dc.subject	Ferroelectric polymers	en
dc.subject	Thermally stimulated discharge currents	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	Crystalline materials	en
dc.subject.other	Dielectric relaxation	en
dc.subject.other	Electric space charge	en
dc.subject.other	Ferroelectric materials	en
dc.subject.other	Phase transitions	en
dc.subject.other	Polarization	en
dc.subject.other	Curie transition	en
dc.subject.other	Ferroelectric polymers	en
dc.subject.other	Polarization parameters	en
dc.subject.other	Thermally stimulated discharge currents	en
dc.subject.other	Polymers	en
dc.title	Space charge and dipolar contributions from amorphous and crystalline phases in ferroelectric polymers	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1080/00150190390238739	en
heal.identifier.secondary	http://dx.doi.org/10.1080/00150190390238739	en
heal.language	English	en
heal.publicationDate	2003	en
heal.abstract	Piezoelectric and pyroelectric properties in semicrystalline polymers originate from dipole disorientation, dimensional changes in the amorphous and crystalline phases, motion of charges necessary for compensation and stabilizing the polarization of the crystallites and reversible changes of crystallinity. Using thermally stimulated discharge currents, isothermal charging and discharging currents the relaxation of space charge and dipolar charge are analyzed. The measurements were carried out for polyamide 11 in a large temperature range below and above the glass-rubber transition temperature of the amorphous phase and for different fields and times to allow an effective selective polarization. By appropriate choice of the polarization parameters, the effects related with permanent dipoles in the crystalline phase, the polarization of the dipoles in the amorphous phase, the effect of the space charge and interfacial polarization are identified. The major part of the charge measured during charging is stored in the sample. The polarization induced by stretching of the sample at room temperature is very stable up to temperatures as high as 150degreesC.	en
heal.publisher	TAYLOR & FRANCIS LTD	en
heal.journalName	Ferroelectrics	en
dc.identifier.doi	10.1080/00150190390238739	en
dc.identifier.isi	ISI:000186527000013	en
dc.identifier.volume	294	en
dc.identifier.spage	113	en
dc.identifier.epage	122	en