Improving the dielectric properties of poly(vinylidene fluoride) composites by using poly(vinyl pyrrolidone)-encapsulated polyaniline nanorods

The introduction of conductive polymers can significantly improve the dielectric constant of polymer-based materials but results in overly large increases of dielectric loss. Herein, uniform-sized and easily dispersed polyaniline nanorods (dPANI@PVP) were synthesized by applying a dynamically interf...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2016-01, Vol.4 (7), p.154-151
Main Authors: Yu, Shuangmin, Qin, Fan, Wang, Gengchao
Format: Article
Language:English
Subjects:
Dielectric constant
Dielectric loss
Dispersions
Nanocomposites
Nanorods
Polyanilines
Polymers
Polyvinylidene fluorides
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Summary:The introduction of conductive polymers can significantly improve the dielectric constant of polymer-based materials but results in overly large increases of dielectric loss. Herein, uniform-sized and easily dispersed polyaniline nanorods (dPANI@PVP) were synthesized by applying a dynamically interfacial polymerization method and encapsulating the nanorods with poly(vinyl pyrrolidone) (PVP). The synthesized dPANI@PVP was then used to fabricate poly(vinylidene fluoride)-based (PVDF) nanocomposites that displayed a high dielectric constant and low dielectric loss. Morphological and structural analyses showed the insulating PVP shell to have a thickness of 5-10 nm and to be wrapped on the dPANI nanorod surface, which not only provided a barrier layer between the conductive dPANI nanorods, but also facilitated an excellent dispersion of dPANI nanorods in the PVDF matrix. As a result, the dPANI@PVP/PVDF nanocomposites showed a relatively low dielectric loss while maintaining a sufficiently high dielectric constant. Specifically, when the loading of dPANI@PVP was 9.5 wt%, the dielectric constant of the nanocomposite reached 174 at 100 Hz, which is about 20 times higher than that of pure PVDF. Moreover, there was only a small increase of the dielectric loss from 0.06 for pure PVDF to 0.17 for the nanocomposite. A promising PVDF-based dielectric polymer nanocomposite based on easily dispersed and poly(vinyl pyrrolidone)-encapsulated polyaniline nanorods (dPANI@PVP) was fabricated and displayed a high dielectric constant and low dielectric loss.
ISSN:2050-7526
2050-7534
DOI:10.1039/c5tc04026d