THE DIELECTRIC PROPERTIES OF NYLON 66/ARAMID FIBRE MICROCOMPOSITES IN THE PRESENCE OF TRANSCRYSTALLINITY

摘要

Dielectric spectroscopy was applied in the present work for the first time to polymeric composite materials containing transcrystallinity, wherein the dielectric properties of pure nylon 66 and of aramid fibre-reinforced nylon 66 microcomposites were examined over wide frequency and temperature ranges. The dielectric response was found to be sensitive to the presence of transcrystallinity in the microcomposites. It was found that the activation energy of the α, β and γ relaxations exhibits typical variations in the presence of reinforcement and transcrystallinity. The specific values of the dielectric loss and dielectric loss tangent at 1MHz as a function of temperature for the transcrystalline layer were retrieved from the composites data using the rule-of-mixtures. A comparison was conducted between the values of the transcrystalline layer and those of the bulk matrix to determine the effect of the transcrystalline layer on the dielectric properties.