Dielectric relaxation dynamics of high-temperature piezoelectric polyimide copolymers
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Altres documents de l'autoria: Maceiras, A.; Costa, C. M.; Lopes, A. C.; San Sebastián, M.; Laza Terroba, José Manuel; Vilas, J. L.; Gomez Ribelles, Jose Luis; Sabater Serra, Roser; Andrio, Andreu; lanceros-mendez, senentxu; León Isidro, Luis Manuel
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Mostra el registre complet de l'elementcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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Títol
Dielectric relaxation dynamics of high-temperature piezoelectric polyimide copolymersAutoria
Data de publicació
2015-08Editor
SpringerCita bibliogràfica
MACEIRAS, A.; COSTA, C. M.; LOPES, A. C.; SAN SEBASTIÁN, M.; LAZA TERROBA, José Manuel; VILAS, J. L.; GÓMEZ RIBELLES, José Luis; SABATER SERRA, Roser; ANDRIO BALADO, Andreu; LANCEROS MÉNDEZ, S.; LEÓN ISIDRO, Luis Manuel. Dielectric relaxation dynamics of high-temperature piezoelectric polyimide copolymers. Applied Physics A (2015), v. 120, Issue 2, pp. 731-743Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://link.springer.com/article/10.1007%2Fs00339-015-9251-8Versió
info:eu-repo/semantics/submittedVersionParaules clau / Matèries
Resum
Polyimide copolymers have been prepared based on different diamines as comonomers: a diamine without CN groups and a novel synthesized diamine with two CN groups prepared by polycondensation reaction followed by thermal ... [+]
Polyimide copolymers have been prepared based on different diamines as comonomers: a diamine without CN groups and a novel synthesized diamine with two CN groups prepared by polycondensation reaction followed by thermal cyclodehydration. Dielectric spectroscopy measurements were performed, and the dielectric complex function, ac conductivity and electric modulus of the copolymers were investigated as a function of CN group content in the frequency range from 0.1 to 107 Hz at temperatures from 25 to 260 °C. For all samples and temperatures above 150 °C, the dielectric constant increases with increasing temperature due to increasing conductivity. The α-relaxation is just detected for the sample without CN groups, being this relaxation overlapped by the electrical conductivity contributions in the remaining samples. For the copolymer samples and the polymer with CN groups, an important Maxwell–Wagner–Sillars contribution is detected. The mechanisms responsible for the dielectric relaxation, conduction process and electric modulus response have been discussed as a function of the CN group content present in the samples. [-]
Publicat a
Applied Physics A (2015), v. 120, Issue 2Drets d'accés
http://rightsstatements.org/vocab/CNE/1.0/
info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
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