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Koviljka A. Asanovic,Dragana D. Cerovic,Mirjana M. Kostic,Tatjana V. Mihailovic,Aleksandra M. Ivanovska 한국섬유공학회 2020 Fibers and polymers Vol.21 No.10
In this work, the volume electrical resistivity and dielectric loss tangent of viscose/polypropylene multipurposenonwoven fabrics were examined. According to the obtained results, the changes in the volume electrical resistivity dependon the applied chemical bonding agent, viscose fiber content, moisture content, fabric thickness, fabric weight, and relativeair humidity. Based on the volume electrical resistivity hysteresis, the portion of sorbed moisture retained in the material afterdesorption, as well as the portion of moisture removed from the material during desorption, were determined. Furthermore,the dielectric loss tangent measured at the frequency range between 30 Hz and 140 kHz, for the samples exposed to differentrelative air humidity (40 % and 80 %) and wet samples, is dependent on the chemical bonding agent, viscose fiber content,moisture content, as well as frequency of the external electric field. The dielectric loss tangent measured at 80 % relative airhumidity showed a peak at about 100 Hz, while for the wet samples, the peak was observed in the frequency range between30 and 140 kHz. In a wet state, the dielectric loss tangent is primarily influenced by the water molecules present in thesample.