Dielectric, electric, and piezoelectric properties of three‐phase piezoelectric composite based on castor‐oil polyurethane, lead zirconate titanate particles and multiwall carbon nanotubes

The effects of multiwall carbon nanotubes (MWCNTs) on the electrical, dielectric, and piezoelectric properties of the ferroelectric ceramic/castor‐oil polyurethane (PUR) composite films were evaluated. The three‐phase piezoelectric composites were produced by keeping PUR concentration constant while...

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Bibliographic Details
Published in:Journal of applied polymer science 2023-03, Vol.140 (9), p.n/a
Main Authors: Freire Filho, Fernando C. M., Santos, Josiane A., Sanches, Alex O., Medeiros, Eliton S., Malmonge, José A., Silva, Michael J.
Format: Article
Language:English
Subjects:
castor‐oil polyurethane
Charged particles
composite
Composite materials
Electrical conduction
Electrical resistivity
Ferroelectricity
lead zirconate titanate
Lead zirconate titanates
Materials science
Multi wall carbon nanotubes
multiwalled carbon nanotubes
Nanoparticles
Percolation
Piezoelectricity
Polymers
Polyurethane resins
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Summary:The effects of multiwall carbon nanotubes (MWCNTs) on the electrical, dielectric, and piezoelectric properties of the ferroelectric ceramic/castor‐oil polyurethane (PUR) composite films were evaluated. The three‐phase piezoelectric composites were produced by keeping PUR concentration constant while varying lead zirconate titanate (PZT) volume fractions between 10 and 50 vol.%, at two MWCNT concentrations: above and below percolation threshold. The dc electrical conductivity analysis revealed that small amounts of MWCNTs dispersed within PUR/PZT composite films can significantly improve electrical and piezoelectric properties due to their ability to act as conductive bridges between PZT particles in the samples. Using Jonscher's power law, it was possible to determine that the electrical conduction in ac regime occurs through spatial charge hopping between states located within the piezoelectric composite. Analyzing the piezoelectric properties through the d33 coefficient, it was found that PUR‐MWCNT/PZT piezoelectric composite displayed higher d33 values (20 pC/N) in comparison to the PUR/PZT two‐phase composite (9.5 pC/N) for all PZT loadings. According to these results, the dispersion of MWCNT nanoparticles influences the poling effectiveness of the PZT particles and increases the d33 coefficient of three‐phase piezoelectric composites.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.53572