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Effects of MgO ceramic filler on microwave dielectric properties of MgO/polymers (polytetrafluoroethylene, polypropylene, polystyrene) composites

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Abstract

The microwave dielectric properties of MgO/polytetrafluoroethylene (PTFE), polypropylene (PP), and polystyrene (PS) composites were investigated as a function of the MgO content and crystallinity of the polymers. MgO powders were prepared by two-step heat treatment. Ceramic polymer composites were prepared with 0.1–0.5 volume fractions (Vf) MgO filler dispersed on three types of polymer matrices using the hot-moulding technique. With the increase in the MgO content, the dielectric constants (K) of the composites increased owing to the decrease in the interparticle distance between the MgO ceramics and higher K of MgO (9.61) than those of PTFE (2.14), PP (3.05), and PS (3.40). Several theoretical models were employed to predict the effective K of the composite. The predicted values were compared to experimental data. With the increase in the MgO content, the quality factor (Q × f) of the composites decreased owing to the increase in the blocking effect. In particular, the MgO/PP composite with Vf of MgO of 0.1 exhibited a higher Q × f (48,330 GHz) than those of the MgO/PS and MgO/PTFE composites with Vf of MgO of 0.1.

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Acknowledgements

This work was supported by Kyonggi University Graduate Research Assistantship 2022.

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  1. Department of Advanced Materials Engineering, Kyonggi University, Suwon, 16227, Gyeonggi-Do, Korea

    Jae Young Jeong & Eung Soo Kim

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  1. Jae Young Jeong
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  2. Eung Soo Kim
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Jeong, J.Y., Kim, E.S. Effects of MgO ceramic filler on microwave dielectric properties of MgO/polymers (polytetrafluoroethylene, polypropylene, polystyrene) composites. J. Korean Phys. Soc. 82, 81–90 (2023). https://doi.org/10.1007/s40042-022-00683-9

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  • DOI: https://doi.org/10.1007/s40042-022-00683-9

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