Electrical behavior of PET-matrix composites

Author

Martinu, L. ; Castelli, A. ; Bastioli, C.

Author_Institution

Dept. of Eng., Phys., Ecole Polytech., Montreal, Que., Canada

fYear

1990

fDate

28-31 Oct 1990

Firstpage

172

Lastpage

177

Abstract

The electrical properties of composites prepared by injection or compression molding of poly(ethylene terephthalate) (PET) with different amounts of filters were studied. The resistivity of composites with low filler concentrations was found to depend on the microstructure imposed by the preparation process. The resistivity of filler materials dominates at higher concentrations. Interfacial polarization and/or hopping conductivity in mica due to impurities may contribute to the conductivity of PET/mica composites. The dielectric response in the 10 ³-10⁷ Hz region was found to be qualitatively dominated by the PET matrix, exhibiting a β-relaxation centered around 5.4×10⁵ Hz. However, absolute values for ∈ ₁ and ∈₂ are influenced by the properties of corresponding fillers. Measurements of ∈(f) over a wider frequency range should help clarify the correlation of composite microstructure and dielectric response

Keywords

dielectric polarisation; dielectric relaxation; filled polymers; hopping conduction; β-relaxation; 1E-3 to 1E-7 Hz; PET-matrix composites; PET/mica composites; composite microstructure; compression molding; dielectric response; filler concentrations; hopping conductivity; injection moulding interfacial polarisation; preparation process; resistivity; Compression molding; Conducting materials; Conductivity; Dielectric materials; Dielectric measurements; Filters; Impurities; Microstructure; Polarization; Positron emission tomography;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1990. Annual Report., Conference on

Conference_Location

Pocono Manor, PA

Type

conf

DOI

10.1109/CEIDP.1990.201338

Filename

201338