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Fabrication of Dielectric Elastomer Composites by Locking a Pre-Stretched Fibrous TPU Network in EVA

Department of Textile Materials and Textile Design, College of Textiles and Clothing, Qingdao University, Qingdao 266071, China
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Materials 2018, 11(9), 1687; https://doi.org/10.3390/ma11091687
Received: 10 August 2018 / Revised: 3 September 2018 / Accepted: 9 September 2018 / Published: 12 September 2018
Dielectric elastomer (DE) composites with high electrical breakdown strength and large voltage-induced deformation were developed by retaining pre-stretched thermoplastic polyurethane (TPU) fibers in ethylene vinyl acetate copolymer (EVA). The microstructure of the candidate E-TPU fiber membrane and EVA coated E-TPU (E-TPU/EVA) film were characterized by scanning electron microscopy (SEM). The quasi-static and dynamic mechanical property, and the electromechanical properties, including the dielectric constant, dielectric loss tangent, and electromechanical sensitivity, of the DE composites were evaluated. Initially, tensile tests demonstrated that the DE composites based on E-TPU/EVAs had a higher elongation at break of above 1000% but a low elastic modulus of approximately 1.7 MPa. Furthermore, dielectric spectroscopy showed that the E-TPU/EVA had a dielectric constant of 4.5 at the frequency of 1000 Hz, which was 1.2 times higher than that of pure EVA film. Finally, it was found from electromechanical test that the voltage induced strain of E-TPU/EVA rose to 6%, nearly 3 times higher than that of pure TPU film, indicating an excellent electromechanical property. The DE composites developed have demonstrated the potential to be good candidate materials in the fields of artificial intelligence, biomimicry and renewable energy. View Full-Text
Keywords: thermoplastic polyurethane; dielectric elastomer; EVA; electromechanical properties thermoplastic polyurethane; dielectric elastomer; EVA; electromechanical properties
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MDPI and ACS Style

Jiang, L.; Zhou, Y.; Wang, Y.; Jiang, Z.; Zhou, F.; Chen, S.; Ma, J. Fabrication of Dielectric Elastomer Composites by Locking a Pre-Stretched Fibrous TPU Network in EVA. Materials 2018, 11, 1687.

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