Tuning piezoelectric properties in elastomeric polyurethane nanocomposites utilizing cellulose nanocrystals

Flexible piezoelectric nanocomposites have been the subject of a lot of recent research due to the development and use of wearable electronic devices and the increasing need for new harvesting devices and sensors due to increasingly intelligent and interconnected cities. In this study, flexible piez...

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Bibliographic Details
Published in:Journal of applied polymer science 2021-09, Vol.138 (34), p.n/a
Main Authors: Sanches, Alex O., Silva, Michael J., Malmonge, Luiz F., Basso, Nara R. S., Malmonge, José A.
Format: Article
Language:English
Subjects:
Cellulose
Ceramics
dielectric properties
Elastomers
Electronic devices
Lead zirconate titanates
Materials science
Morphology
Nanocomposites
Nanocrystals
nanostructures
Piezoelectricity
Polymers
Polyurethane resins
thermogravimetric analysis
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Summary:Flexible piezoelectric nanocomposites have been the subject of a lot of recent research due to the development and use of wearable electronic devices and the increasing need for new harvesting devices and sensors due to increasingly intelligent and interconnected cities. In this study, flexible piezoelectric nanocomposites using elastomeric polyurethane (PU) as matrix, and lead zirconate titanate (PZT) as active phase, were produced using cellulose nanocrystals (CNC) as the third phase. The study describes the effect of CNC insertion on the morphology, thermal, electrical, and piezoelectric properties of the nanocomposites. It points out that the CNCs not only act to cause greater dispersion of the ceramic grains in the matrix, but also to lead to greater polarization effectiveness of the ceramic grains, resulting in a longitudinal piezoelectric coefficient (d33) increase of more than 370%, as compared with biphasic composites dependent on the ceramic and nanocrystals content. There is great interest in the development of flexible piezoelectric composites forwearable electronic devices, sensors and harvesting devices. In this study, flexible piezoelectric nanocomposites were prepared using polyurethane as matrix, PZT and cellulose nanocrystals asthe second and third phases, respectively. The cellulose nanocrystals have been shown to improve the dispersion of the ceramic in the matrix and constitute the percolative path to the water. Such factors promoted a significant increase in the piezoelectric coefficient of the nanocomposites.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.50865