Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Strain Effect on Dielectricity of Elastic Thermoplastic Polyurethanes

Yubo Wang
,
Huali Yang
* ,
Yali Xie
* ORCID logo ,
Xilai Bao
ORCID logo ,
Lili Pan
,
Dan Zhao
,
Jinxia Chen
,
Mengting Zou
,
Tian Tian
* ORCID logo ,
Run-Wei Li
*
Version 1 : Received: 4 April 2024 / Approved: 4 April 2024 / Online: 4 April 2024 (12:34:54 CEST)

How to cite: Wang, Y.; Yang, H.; Xie, Y.; Bao, X.; Pan, L.; Zhao, D.; Chen, J.; Zou, M.; Tian, T.; Li, R. Strain Effect on Dielectricity of Elastic Thermoplastic Polyurethanes. Preprints 2024, 2024040378. https://doi.org/10.20944/preprints202404.0378.v1 Wang, Y.; Yang, H.; Xie, Y.; Bao, X.; Pan, L.; Zhao, D.; Chen, J.; Zou, M.; Tian, T.; Li, R. Strain Effect on Dielectricity of Elastic Thermoplastic Polyurethanes. Preprints 2024, 2024040378. https://doi.org/10.20944/preprints202404.0378.v1

Abstract

Dielectric elastomers, such as thermoplastic polyurethanes (TPU), are widely used as dielectric layer, emulation layer and substrate of flexible and stretchable devices. To construct capacitors and actuators that work stably upon deformation, it has become an urgent need to investigate the evolution of dielectricity under stress and strain. However, the lack of effective methods for estimating the dielectric constant of elastomers under strain poses a big challenge. This article reports a device for in-situ measuring the dielectric constant of TPU under strain. It is found that upon stretching TPU to a strain of 400%, its dielectric constant decreases from 8.47 to 2.94. In addition, combined Fourier-transform infrared spectroscopy, X-ray scattering technique, and atomic force microscopy have been utilized to characterize the evolution of microstructure under strain. The investigation under tensile strain reveals that a decreased density and average size of polarized hard domains, along with a tendency of the molecular chains to align in parallel with the tensile stress. The evolution of the microstructures results in a reduction of the dielectric constant parallel to the electric field in TPU. Our work provides valuable experimental reference for improving the stability of flexible sensors and actuators based on dielectric elastomers.

Keywords

dielectric constant; dielectric elastomer; polyurethane; strain; hard domains

Subject

Chemistry and Materials Science, Polymers and Plastics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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