Frequency and Temperature Dependences of Dielectric Dispersion and Electrical Properties of Polyvinylidene Fluoride/Expanded Graphite Composites | Zendy

Yuchao Li | Zendy; Robert K.Y. Li | Zendy; S. C. Tjong | Zendy

Open Access

Frequency and Temperature Dependences of Dielectric Dispersion and Electrical Properties of Polyvinylidene Fluoride/Expanded Graphite Composites

Author(s) -

Yuchao Li,

Robert K.Y. Li,

S. C. Tjong

Publication year - 2010

Publication title -

journal of nanomaterials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.463

H-Index - 66

eISSN - 1687-4129

pISSN - 1687-4110

DOI - 10.1155/2010/261748

Subject(s) - materials science , percolation (cognitive psychology) , permittivity , dielectric , analytical chemistry (journal) , algorithm , computer science , chemistry , chromatography , optoelectronics , neuroscience , biology

A conductive nanofiller, expanded graphite (EG), was introduced into polyvinylidene fluoride (PVDF) by direct melt blending process. The electrical conductivity and dielectric properties of resulting PVDF/EG composites were investigated in a wide range of frequencies from 102 to 108 Hz. The dielectric dispersion and conductivity of the composite system exhibited a strong frequency dependence particularly in the vicinity of percolation threshold (Φc=6 vol%). Moreover, the dielectric permittivity tended to decrease with increasing frequency while the conductivity displayed a reverse trend. A large permittivity was found in the composite having EG content near Φc. Accordingly, percolation concept and biased random walk approach can be used to describe the carrier transport of percolating PVDF/EG system. The conductivity and permittivity of percolating PVDF/EG composites were observed to be temperature dependent

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