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INVESTIGATION OF ELECTRICAL PROPERTIES OF THE HYBRID COMPLEX SYSTEM CONSISTING OF EPOXY RESIN-ARAMID FIBRES-METAL POWDER

By ΓΕΩΡΓΙΟΣ ΨΑΡΡΑΣ

Abstract

THE SUBJECT OF THE PRESENT WORK IS THE INVESTIGATION OF THE DIELECTRIC BEHAVIOUR OF COMPLEX SYSTEMS WITH POLYMERIC MATRIX. IN PARTICULAR THE BEHAVIOUR OF THEFOLLOWING COMPOSITE SYSTEMS, IS EXAMINED: A) EPOXY RESIN-ALUMINUM POWDER, B) EPOXY RESIN-ARAMID FIBRES, C) EPOXY RESIN-ALUMINUM POWDER-ARAMID FIBRES. THE DIELECTRIC BEHAVIOUR OF THE COMPOSITE SYSTEMS, FOR VARIOUS CONDUCTIVE AND NON CONDUCTIVE FILLER CONTENTS, IS STUDIED IN THE FREQUENCY RANGE OF 20H2 TO 13MH2 AND IN THE TEMPERATURE RANGE OF 10 TO 150 C. THE MAXWELL-WAGNER-SILLARS EFFECTOR INTERFACIAL POLARIZATION IS EVIDENT IN THE LOW FREQUENCY RANGE, AND IT IS INCREASED WITH THE FILLER CONTENT, ESPECIALLY IN HYBRID COMPOSITES. COMPOSITES, WITH METAL POWDER, EXHIBIT HIGHER PERMITIVITY AND HIGHER DIELECTRIC LOSS THAN THE PURE RESIN. THE PRESENCE OF ARAMID FIBRES DOES NOT AFFECT SIGNIFICANTLY THE BEHAVIOUR OF THE SYSTEMS. AT ELEVATED TEMPERATURES, CLOSE TO THE (TG) REGION, AN INCREASE OF DIELECTRIC LOSS IS OBSERVED, WHICH IS ATTRIBUTED TO AN A-RELAXATION PROCESS. IN THE HYBRID COMPOSITES THE ALUMINUM INFLUENCE IS STRONGER THAN THE INFLUENCE OF ARAMID FIBRES. A MODEL FOR THE DESCRIPTION OF THE DIELECTRIC BEHAVIOUR, OF COMPLEX SYSTEMS IS DEVELOPED. THE MODEL IS PRODUCED BY EXTENSION OF THE LOGARITHMIC LOW OF MIXTURES AND IT IS REFERING TO THE ABOVE COMPLEX SYSTEMS. THE APPLICABILITY OF THE MODEL IS TESTED WITH THE OBTAINED EXPERIMENTAL DATA. THE PROPOSED MODEL IS DISCUSSED AND CORRELATION BETWEEN THEORETICAL AND EXPERIMENTAL VALUES IS FOUND TO BE SATISFACTORY.

Topics: Composite materials, COMPOSITES OF EPOXY-ALUMINUM PARTICLES, COMPOSITES OF EPOXY-KEVLAR FIBRES, Dielectric behaviour, ELECTRICAL PROPERTIES OF PARTICULATE POLYMERIC COMPOSITES, HYBRID COMPOSITE OF EPOXY-ALUMINUM-KEVLAR FIBRES, Διηλεκτρική συμπεριφορά, ΗΛΕΚΤΡΙΚΕΣ ΙΔΙΟΤΗΤΕΣ ΣΥΝΘΕΤΩΝ ΠΟΛΥΜΕΡΙΚΗΣ ΜΗΤΡΑΣ, ΣΥΝΘΕΤΑ ΕΠΟΞΕΙΔΙΚΗΣ ΡΗΤΙΝΗΣ-ΑΡΑΜΙΔΙΚΩΝ ΙΝΩΝ, ΣΥΝΘΕΤΑ ΕΠΟΞΕΙΔΙΚΗΣ ΡΗΤΙΝΗΣ-ΑΡΓΙΛΙΟΥ, Σύνθετα υλικά, ΥΒΡΙΔΙΚΟ ΣΥΣΤΗΜΑ ΡΗΤΙΝΗΣ-ΑΡΓΙΛΙΟΥ-ΑΡΑΜΙΔΙΚΩΝ ΙΝΩΝ
Publisher: National Technical University of Athens (NTUA)
Year: 1994
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