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

• Main Authors: Iwona Karbownik, Olga Rac-Rumijowska, Tomasz Rybicki, Patrycja Suchorska-Wozniak, Helena Teterycz
• Format: Article
• Language: English
• Published: IEEE 2021-01-01
• Series: IEEE Access
• Subjects: Composite materials; conductivity measurement; current-voltage characteristics; polymers; textile fibers
• Online Access: https://ieeexplore.ieee.org/document/9427269/

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 &#x00B0;C to 100 &#x00B0;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 &#x0025; 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 &#x00B0;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.