ALINA-RUXANDRA CARAMITU, SORINA MITREA, VIRGIL MARINESCU, GEORGE-ANDREI URSAN, MIHAELA ARADOAIE, IOSIF LINGVAY DIELECTRIC BEHAVIOR AND MORPHOSTRUCTURAL CHARACTERISTICS OF SOME HDPE COMPOSITES / METAL NANOPOWDERS
HDPE composite samples with aluminum and iron nanopowders were made by extrusion and injection. Samples of material obtained were characterized by comparative determinations of dielectric spectroscopy and SEM microscopy. SEM images have indicated that the agglomerations of the powders used are persistent, do not decompose during extrusion and injection processing. Determinations by dielectric spectroscopy indicated that HDPE composite materials with metal nanopowder filler have higher dielectric losses than pure HDPE (reference). The highest increases in tgd up to 2.6 times, were recorded for 50 nm nanopowders with specific high surface area (over 20 m2 / g). The electrical conductivity of the investigated samples increases with increasing frequency, both for pure HDPE and for HDPE with metal powder filler. As a result of the film effect in the HDPE case with metal filler, the increases in the high frequencies range are lower than in the extremely low frequencies range.
Keywords: HDPE, iron nanopowder, aluminum nanopowder, composite, dielectric loss, conductivity