The Effect of Temperature on Electric Conductivity of Polyacrylonitrile-Polyaniline Fibers

• Published in: IEEE access Vol. 9; pp. 74017 - 74027
• Main Authors: Karbownik, Iwona, Rac-Rumijowska, Olga, Rybicki, Tomasz, Suchorska-Wozniak, Patrycja, Teterycz, Helena
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Composite materials; Conductivity; conductivity measurement; Contact resistance; Current voltage characteristics; Electric contacts; Electrical properties; Electrical resistivity; Electrode polarization; Fibers; Humidity; Optical fiber polarization; Optical fiber sensors; Optical fiber testing; Plastics; Polyacrylonitrile; Polyanilines; polymers; Relative humidity; Resistance; Solvents; Temperature; Temperature effects; Temperature measurement; textile fibers
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2021.3078835

The article presents an analysis of the influence of temperature on the electrical conductivity of composite polyacrylonitrile-polyaniline fibers (PAN/PANI). The fibers are obtained by synthesizing polyaniline directly in the spinning solution of fiber-forming polyacrylonitrile and characterized by X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM) methods. Electrical characterization of fibers is performed by current-voltage characteristic. The polarizing voltage of the electrodes in the range from -1 V to 1 V with a speed of 100 mV/sec is changed cyclically and linearly while simultaneously the current is measured. The current-voltage characteristic of the fibers is recorded at various temperatures in the range from -15 °C to 100 °C for 30 min. Based on the measurements, temperature changes in the conductance are determined in constant relative humidity. The current-voltage characteristics of the fibers in the ambient atmosphere with a relative humidity of 38 % are linear and symmetrical, which indicates the electron nature of the conductivity and the ohmic contact of the electrode-fiber. The characteristic of temperature conductance changes is not of a typical shape, it is parabolic. The conductance of the developed PAN/PANI fibers at 22 °C is about <inline-formula> <tex-math notation="LaTeX">1.50\cdot 10^{\mathrm {-4 { }}}\text{S} </tex-math></inline-formula> (6.7 <inline-formula> <tex-math notation="LaTeX">\text{k}\Omega </tex-math></inline-formula>) and decreases below and above this temperature. The analysis of research results and literature data enables the determination of individual factors affecting changes in conductance of the tested composite fiber.