Title :
Electrical behavior of PET-matrix composites
Author :
Martinu, L. ; Castelli, A. ; Bastioli, C.
Author_Institution :
Dept. of Eng., Phys., Ecole Polytech., Montreal, Que., Canada
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;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1990. Annual Report., Conference on
Conference_Location :
Pocono Manor, PA
DOI :
10.1109/CEIDP.1990.201338
