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

Autor:	Juan Alejandro Herbsommer, Julia W. P. Hsu, Michael D. Womble, Yun Ju Lee
Rok vydání:	2018
Předmět:	chemistry.chemical_classification Polypropylene Permittivity 010407 polymers Materials science Nanocomposite Polymer nanocomposite Mechanical Engineering Nanoparticle 02 engineering and technology Polymer Dielectric 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Mechanics of Materials General Materials Science Dielectric loss Composite material 0210 nano-technology
Zdroj:	Journal of Materials Science. 53:9149-9159
ISSN:	1573-4803 0022-2461
DOI:	10.1007/s10853-018-2223-6
Popis:	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 (eeff) 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 eeff 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 eeff 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.
Databáze:	OpenAIRE
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