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Effects of TiO2 nanoparticle size and concentration on dielectric properties of polypropylene nanocomposites

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Abstract

Polymer nanocomposites are promising materials for dielectric waveguides in high-data-rate communications, where extremely low loss is required. In this paper, we study the effect of titania (TiO2) nanoparticle size (30–300 nm) and concentration on the effective permittivity (εeff) and dielectric loss (tan δ) of polypropylene (PP) nanocomposites in two different frequency ranges: 100 Hz–300 kHz and 140 GHz–220 GHz. To aid the dispersion of TiO2 in the PP matrix, polypropylene-graft-maleic anhydride (PP-g-MA) is added. Using this approach, an εeff of 6.84 with tan δ of 0.0049 at 220 GHz is achieved in a 21.5 vol% 100 nm TiO2/PP nanocomposite. We find that εeff is insensitive to nanoparticle size in both frequency ranges while tan δ appears to depend on the filler size at the low frequency range. By using complex permittivity in Lichtenecker’s model, we are able to separate the loss contribution of the polymer matrix from that of the TiO2 nanoparticles. Our results provide insight into the choice of nanoparticle size and the effects of compatibilizer on millimeter-wave dielectric properties.

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Acknowledgements

We thank Prof. W. Voit for the use of the speed mixer and the hot press, Dr. B. Cook for useful discussion, and the University of Dallas and Texas Instruments for the financial support of this project.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Texas at Dallas, 800 W Campbell Rd, Richardson, TX, 75080, USA

    Michael D. Womble, Yun-Ju Lee & Julia W. P. Hsu

  2. Kilby Labs, Texas Instruments, 13500 N Central Expy, Dallas, TX, 75243, USA

    Juan Herbsommer

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  1. Michael D. Womble
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  2. Juan Herbsommer
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  3. Yun-Ju Lee
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  4. Julia W. P. Hsu
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Correspondence to Julia W. P. Hsu.

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Womble, M.D., Herbsommer, J., Lee, YJ. et al. Effects of TiO2 nanoparticle size and concentration on dielectric properties of polypropylene nanocomposites. J Mater Sci 53, 9149–9159 (2018). https://doi.org/10.1007/s10853-018-2223-6

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  • DOI: https://doi.org/10.1007/s10853-018-2223-6

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