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Samples of epoxy filled with micrometric quartz were prepared with or without the addition of a small amount of nanoclay, in regard to the quartz content. The influence of the nanofiller on heat treatment after curing was characterized using dielectric spectroscopy. It was put in evidence that the addition of nanofillers caused an increase of the relaxation time of the α relaxation process, altered...
This work concerns the study of electrical properties of polymer nanocomposite materials. Through the addition of nanoparticles in a polymer matrix, we seek to improve the physical properties of these “innovative” materials. We propose to study the influence of incorporating silica nanoparticles in a HDPE matrix on the accumulation of space charge. The results presented in this article shall be given...
The objective of this research is to measure and quantitatively model the complex permittivity of PE composites. Dielectric mixing laws are helpful in designing and modeling composites. However, simple algebraic mixing laws do not accurately predict the effective permittivity of multiphase composites. Popular algebraic mixing laws are based on volume fractions and complex permittivities of both phases...
High density polyethylene HDPE/SiO2 nanocomposites were prepared by melt compounding using a twin screw extruder. The thermal properties of the composites were investigated by differential scanning calorimetry (DSC). The microstructures of nanocomposites were characterized by scanning and transmission electron microscopy (SEM and TEM). The dielectric breakdown strength of the nanocomposites was investigated...
In the present experiment, the dielectric response of various types of epoxies was investigated in the frequency and time domain. The samples consisted of nanostructured epoxy microcomposites and reference microcomposites. Water ingression at the fabrication step and/or at measuring time is known to affect the dielectric response of materials such as epoxy. Prior to measurement, some samples were...
The presence of water in insulating solids is known to affect the dielectric properties. Although relaxation processes evolved with the excitation frequency and temperature, further characteristics unfold when contaminant with a high dielectric constant, such as water is involved. When the material consists of a microcomposite, and especially in the advent of incorporation of nanofillers, it is speculated...
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