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Synergistic improvement of piezoelectric properties of PVDF/ CaCO3/montmorillonite hybrid nanocomposites.
- Source :
-
Applied Clay Science . Feb2018, Vol. 152, p93-100. 8p. - Publication Year :
- 2018
-
Abstract
- Poly (vinylidene fluoride), PVDF, based hybrid nanocomposites (micro-CaCO 3 + Montmorillonite (Mt)) containing varying amounts of CaCO 3 (30–40 parts (wt.)) were developed via co-rotating twin-screw extrusion and were subjected to uniaxial stretching. A systematic study was performed to investigate the effect of micro-CaCO 3 content of the hybrid filler and subsequent uniaxial stretching at various draw ratios, R (4–5), on the mechanical, dielectric, electrical and piezoelectric properties of hybrid nanocomposites. For the as-extruded hybrid nanocomposites (without post-extrusion stretching), both dielectric properties and DC volume resistivity improved significantly, probably due to the enhanced charge trapping capability of Mt. in the presence of CaCO 3 micro-filler. Similarly, hybrid nanocomposite containing 40 parts of CaCO 3 and 3 parts (wt.) of Mt. presented the maximum piezoelectric coefficient, d 33 of 7.4 pC/N. For stretched nanocomposites, the volume resistivity and dielectric properties of hybrid nanocomposite containing 40 parts of CaCO 3 and 3 parts of Mt. decreased gradually with R presumably due to its porous structure, as observed in SEM. However, stretched hybrid nanocomposites consistently exhibited enhanced piezoelectricity where the highest d 33 value of 30.6 pC/N at R of 5 was obtained, which is attributed to the almost 100% β phase content and dipolar orientation induced by stretching and subsequent poling. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01691317
- Volume :
- 152
- Database :
- Academic Search Index
- Journal :
- Applied Clay Science
- Publication Type :
- Academic Journal
- Accession number :
- 126708915
- Full Text :
- https://doi.org/10.1016/j.clay.2017.10.036