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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...
Kevlar® (poly p-phenylene terephthalamide, PPTA) and PBI (poly benzimidazole) are two high-performance fibers with excellent thermal stability, a feature that makes them suitable for applications in aerospace, automotive and firefighting protective clothing. In a previous study, it was found that the tensile breaking force of yarns pulled from Kevlar/PBI fabric decreased to 50% of its original value...
Epoxy based compounds containing micrometric and nanometric silica were prepared. These were utilized in a comparative study to establish their dielectric behaviour. In this study, the weight %-content of the silica filler was varied as a parameter. Some filler distributions were characterized using TEM. In general, the micrographs illustrate a satisfactory dispersion, showing a nanostructured morphology...
Material samples were prepared consisting of silica particles in an epoxy matrix. The generic compound contained a large amount of micrometric silica (e.g. 60% wt.) and a few % of nanosilica. Investigation of the microstructure of the samples showed that indeed the microcomposites exhibited a nanostructured morphology. Dielectric spectroscopy was used to compare the behavior of materials differing...
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