Thickness‐dependent microstructural and electromechanical properties in polyurethane films obtained by polymer solution casting

ABSTRACT Electroactive polymers (EAPs) are promising materials for actuation and energy harvesting applications. Among the EAPs, polyurethane (PU) material is of considerable interest given its high values of deformation under an electric field. The electromechanical properties were found to be depe...

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Bibliographic Details
Published in:Journal of applied polymer science 2019-01, Vol.136 (3), p.n/a
Main Authors: Wongtimnoi, K., Cavaillé, J.‐Y., Chenal, J.‐M., Guiffard, B., Bogner, A., Seveyrat, L.
Format: Article
Language:English
Subjects:
Actuation
Deformation
Die casting
Elastomers
Electric fields
Electroactive polymers
Electrostriction
Energy harvesting
Engineering Sciences
Materials science
Phase separation
Polymers
Polyurethane resins
Thick films
Thickness
Thin films
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Summary:ABSTRACT Electroactive polymers (EAPs) are promising materials for actuation and energy harvesting applications. Among the EAPs, polyurethane (PU) material is of considerable interest given its high values of deformation under an electric field. The electromechanical properties were found to be dependent on the processing technique and the thickness of the film. To understand this relationship, a comprehensive study was carried out on polyether‐based thermoplastic PU elastomer films elaborated by solution casting with thicknesses between 12 and 220 μm. Microstructural, dielectric, mechanical, and electrostriction studies were conducted. Thin films present a lower strain for a given electric field compared to thick films. The films exhibit a structural gradient along the thickness direction: a fast evaporation in the upper part of the film close to the interface with air inhibits the phase separation but a more favored one in the lower part. This is consistent with the modeling based on the gradient of dielectric constant and the experimental, mechanical, and dielectric characterizations. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 46981.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.46981