Effect of interfacial interactions on the electromechanical response of poly(vinylidene fluoride-trifluoroethylene)/BaTiO3 composites and its time dependence after poling. (19th June 2015)

• Record Type: Journal Article
• Authors: Dalle Vacche, Sara; Leterrier, Yves; Michaud, Véronique; Damjanovic, Dragan; Aebersold, Arthur B.; Månson, Jan-Anders E.
• Is Part Of: Composites science and technology. Volume 114(2015)
• Page Start: 103
• Page End: 109
• Publication Date: 2015-06-19
• Subjects: A. Coupling agents -- A. Functional composites -- A. Polymer-matrix composites (PMCs) -- B. Electrical properties -- B. Piezoelectric properties; Composite materials -- Periodicals; Composite materials; Fibrous composites; Periodicals; 620.118
• DOI: 10.1016/j.compscitech.2015.04.012
• Languages: English
• ISSNs: 0266-3538

Abstract

Abstract: Solvent cast and compression molded composite films based on poly(vinylidene fluoride-trifluoroethylene), containing pristine and silylated BaTiO3 particles, were poled, and their electromechanical response ( d 33 ), their dielectric properties, and the crystalline structure of the embedded BaTiO3 particles, probed by X-ray diffraction, were recorded during one week. Their d 33 was also measured after long-term aging (> 3 years). During this time the d 33 decreased for all composites. The d 33 of solvent cast composites was higher when surface modified particles were used, both immediately after poling and after aging, while for compression molded composites only slight differences in the initial and aged d 33 of materials containing pristine versus modified particles were found. However the decay rate of d 33 in the short time after poling was highly affected by the surface modification of the particles for both the solvent cast and the compression molded composites. The results suggest that other phenomena besides the polarization of the ceramic particles and of the polymer matrix contribute to the measured electromechanical response of the composites. Charge accumulation and differences in the charge distribution due to the presence of the silane layer on the surface of BaTiO3 may play an important role.