Multipurpose Nonwoven Viscose/Polypropylene Fabrics: Effect of Fabric Characteristics and Humidity Conditions on the Vol
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ISSN 1229-9197 (print version) ISSN 1875-0052 (electronic version)
Multipurpose Nonwoven Viscose/Polypropylene Fabrics: Effect of Fabric Characteristics and Humidity Conditions on the Volume Electrical Resistivity and Dielectric Loss Tangent Koviljka A. Asanovic1*, Dragana D. Cerovic2,3, Mirjana M. Kostic1, Tatjana V. Mihailovic1, and Aleksandra M. Ivanovska1 1
Department of Textile Engineering, Faculty of Technology and Metallurgy, University of Belgrade, Belgrade 11000, Serbia 2 Laboratory for Condensed Matter and Physics of Materials, Faculty of Physics, University of Belgrade, Belgrade 11000, Serbia 3 The College of Textile Design, Technology and Management, Belgrade 11000, Serbia (Received December 10, 2019; Revised January 15, 2020; Accepted February 5, 2020) Abstract: In this work, the volume electrical resistivity and dielectric loss tangent of viscose/polypropylene multipurpose nonwoven fabrics were examined. According to the obtained results, the changes in the volume electrical resistivity depend on the applied chemical bonding agent, viscose fiber content, moisture content, fabric thickness, fabric weight, and relative air humidity. Based on the volume electrical resistivity hysteresis, the portion of sorbed moisture retained in the material after desorption, 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 different relative 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 air humidity showed a peak at about 100 Hz, while for the wet samples, the peak was observed in the frequency range between 30 and 140 kHz. In a wet state, the dielectric loss tangent is primarily influenced by the water molecules present in the sample. Keywords: Multipurpose nonwoven fabrics, Viscose/polypropylene, Volume electrical resistivity, Dielectric loss tangent, Humidity conditions
composition, i.e. the fiber type, content of amorphous and crystalline regions in the fiber, type of fabric, structural characteristics of fabrics, moisture content of the material, etc., and external factors such as the ambient air humidity and temperature [2-21]. The dielectric properties also depend on the frequency of the applied alternating electric field [2-5,12-14,17-21]. Moreover, the chemical treatments of the textile materials such as alkali treatment with sodium hydroxide [14,18], treatment with KMnO4, maleic anhydride modified polypropylene, toluene diisocyanate and stearic acid [17] or treatment with a polymer matrix of chitosan gel with addition of gentamicin sulfate or autochthonous essential oil of Picea abies [15] lead to change their electro-physical properties. George et al. [17] found that the volume resistivity of polypropylene and jute yarns commingled composites de
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