Influence of Matrix and Surfactant on Piezoelectric and Dielectric Properties of Screen-Printed BaTiO3/PVDF Composites
| Autor: | Mohammed Benwadih, Carlo Carbone, Giulia D'Ambrogio, Pierre-Jean Cottinet, Minh-Quyen Le, Jean-Fabien Capsal |
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| Rok vydání: | 2021 |
| Předmět: |
Permittivity
Materials science Piezoelectric coefficient Polymers and Plastics Scanning electron microscope Composite number Organic chemistry 02 engineering and technology Dielectric 010402 general chemistry 01 natural sciences QD241-441 characterization composite Composite material Fourier transform infrared spectroscopy dielectric surface functionalization polarization General Chemistry 021001 nanoscience & nanotechnology screen-printing 0104 chemical sciences Surface modification piezoelectric fluorinated surfactant 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Polymers Volume 13 Issue 13 Polymers, Vol 13, Iss 2166, p 2166 (2021) |
| ISSN: | 2073-4360 |
| DOI: | 10.3390/polym13132166 |
| Popis: | The aim of this paper was to provide insight into the impact of matrix and surfactants on the rheology, morphology, and dielectric and piezoelectric properties of screen-printed BaTiO3/PVDF composites. Two matrices were compared (PVDF–HFP and PVDF–TrFE), and lead-free BaTiO3 microparticles were added in volume fractions of 30% and 60%. Here, we demonstrated that the presence of surfactants, helping to prevent phase separation, was crucial for achieving a decent screen-printing process. Fourier-transform infrared (FTIR) spectroscopy together with scanning electron microscopy (SEM) showed that the two “fluoro-benzoic acid” surfactants established stable bonds with BaTiO3 and improved the dispersion homogeneity, while the “fluoro-silane” proved to be ineffective due to it evaporating during the functionalization process. PVDF–TrFE composites featured a more homogeneous composite layer, with fewer flaws and lower roughness, as compared with PVDF–HFP composites, and their inks were characterized by a higher viscosity. The samples were polarized in either AC or DC mode, at two different temperatures (25 °C and 80 °C). The 30% BaTiO3 PVDF–TrFE composites with two fluorinated surfactants featured a higher value of permittivity. The choice of the surfactant did not affect the permittivity of the PVDF–HFP composites. Concerning the d33 piezoelectric coefficient, experimental results pointed out that PVDF–TrFE matrices made it possible to obtain higher values, and that the best results were achieved in the absence of surfactants (or by employing the fluoro-silane). For instance, in the composites with 60% BaTiO3 and polarized at 80 °C, a d33 of 7–8 pC/N was measured, which is higher than the values reported in the literature. |
| Databáze: | OpenAIRE |
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