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Enhanced Dielectric Performance of P(VDF-HFP) Composites with Satellite–Core-Structured [email protected] Nanofillers

Yongchang Jiang, Zhao Zhang, Zheng Zhou, Hui Yang, Qilong Zhang
Published: 21 September 2019
 by  MDPI
Polymers , Volume 11; doi:10.3390/polym11101541

Abstract: Polymer dielectric materials are extensively used in electronic devices. To enhance the dielectric constant, ceramic fillers with high dielectric constant have been widely introduced into polymer matrices. However, to obtain high permittivity, a large added amount (>50 vol%) is usually needed. With the aim of improving dielectric properties with low filler content, satellite–core-structured [email protected] ([email protected]) nanoparticles were fabricated as fillers for a poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) matrix. The interfacial polarization effect is increased by Fe2O3 nanoparticles, and thus, composite permittivity is enhanced. Besides, the satellite–core structure prevents Fe2O3 particles from directly contacting each other, so that the dielectric loss remains relatively low. Typically, with 20 vol% [email protected] nanoparticle fillers, the permittivity of the composite is 31.7 (1 kHz), nearly 1.8 and 3.0 times that of 20 vol% BT composites and pure polymers, respectively. Nanocomposites also achieve high breakdown strength (>150 KV/mm) and low loss tangent (~0.05). Moreover, the composites exhibited excellent flexibility and maintained good dielectric properties after bending. These results demonstrate that composite films possess broad application prospects in flexible electronics.
Keywords: Nanoparticles / dielectric properties / Polymer composites / Interfacial polarization

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