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Improvement of Relative Ratio of Dielectric Constant to Young’s Modulus of Ethylene Propylene Diene Monomer (EPDM)/High-Barrier Graphene (HBG) for Dielectric Elastomer Application

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Abstract

Ethylene propylene diene monomer (EPDM) possessing nonpolar groups exhibits low dielectric loss and is one of the candidates for fabricating flexible dielectric materials. Incorporation of high amount of ceramics is commonly used to improve dielectric properties of EPDM. However, the high volume fraction makes EPDM rigid and enhances the complex viscosity of composite materials during manufacturing processes. In this study, high-barrier graphene (HBG), which is highly lamellar and thin (lamellar/thickness is approximately 3300), was selected as filler. The study aims to investigate the influence of low-loading HBG on the rheological, vulcanization, dielectric, mechanical, thermal and electric properties of EPDM. In this work, the Raman spectrum shows that the grain size and layer number of HBG is 70 nm and 3–4, respectively. Rheological measurement shows that 3% HBG decreases the complex viscosity of EPDM/HBG nearly by 43%. The Fourier transform infrared (FT-IR) spectrum shows C=C on the HBG surface. Cure curves and parameters show that C=C participates in the vulcanization reaction and increases chemical cross-links of EPDM/HBG. This is an innovative approach to improve the dielectric constant (ε)-to-modulus (Y) ratio of EPDM/HBG by 77% through adjusting HBG content, which could optimize the value of ε and Y. Due to large lamellar size, the thermal conductivity of EPDM/HBG is improved by 20%. Moreover, all EPDM/HBG composites exhibit volume resistivity greater than 1 × 1010 Ω·m, which are regarded as insulated materials.

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Acknowledgments

The study was funded by the Scientific Research Foundation for the introduction of talent (YK19-01-02), from Nanjing Vocational University of Industry Technology.

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  1. College of Mechanics Engineering, Nanjing Vocational University of Industry Technology, Nanjing, 210023, China

    Jun Su

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Su, J. Improvement of Relative Ratio of Dielectric Constant to Young’s Modulus of Ethylene Propylene Diene Monomer (EPDM)/High-Barrier Graphene (HBG) for Dielectric Elastomer Application. J. Electron. Mater. 52, 6089–6097 (2023). https://doi.org/10.1007/s11664-023-10541-4

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