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Polymers 2018, 10(6), 586;

High Permittivity Nanocomposites Embedded with Ag/TiO2 Core–Shell Nanoparticles Modified by Phosphonic Acid

1,2,* , 1,2
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Key Lab of Functional Materials for Electronic Information (B), Ministry of Education, Wuhan 430074, China
Author to whom correspondence should be addressed.
Received: 8 April 2018 / Revised: 14 May 2018 / Accepted: 25 May 2018 / Published: 27 May 2018
(This article belongs to the Special Issue Polymer Hybrids and Composites)
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In this paper, nanocomposites that contain core-shell Ag/TiO2 particles as the filler and polytetrafluoroethylene (PTFE) as the matrix were investigated. Two surfactants, namely octyl phosphonic acid (OPA) and pentafluorobenzyl phosphonic acid (PFBPA), were applied to modify Ag/TiO2 fillers for uniform dispersion in the matrix. Fourier transform infrared spectroscopy analysis of bonds between the TiO2 shells and the phosphonic modifiers shows Ti–O–P chemical bonding between the Ag/TiO2 fillers and the modifiers. Thermogravimetric analysis results show a superior adsorption effect of PFBPA over OPA on the Ag/TiO2 filler surface at the same weight percentage. For nanocomposites that contain modified Ag/TiO2 nanoparticles, the loss was reduced despite the high permittivity at the same loading. The permittivity of the nanocomposites by PFBPA is larger than that of OPA, because the more uniform dispersion of inorganic particles in the PTFE matrix enhances the interfacial polarization effect. The mechanism of enhanced dielectric performance was studied and discussed. View Full-Text
Keywords: core–shell structure; interfacial modification; dielectric properties; nanocomposites core–shell structure; interfacial modification; dielectric properties; nanocomposites

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Chen, X.; Liang, F.; Lu, W.; Jin, Z.; Zhao, Y.; Fu, M. High Permittivity Nanocomposites Embedded with Ag/TiO2 Core–Shell Nanoparticles Modified by Phosphonic Acid. Polymers 2018, 10, 586.

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