The Preparation and Characterization of Polyacrylonitrile-Polyaniline (PAN/PANI) Fibers

Abstract

The paper presents a method of modifying polyacrylonitrile (PAN) fibers using polyaniline (PANI). The PAN fibers were doped with polyaniline that was obtained in two different ways. The first consisted of doping a spinning solution with polyaniline that was synthesized in an aqueous solution (PAN/PANI blended), and the second involved the synthesis of polyaniline directly in the spinning solution (PAN/PANI in situ). The obtained fibers were characterized by the methods: X-ray powder diffraction (XRD), scanning electron microscope (SEM), fourier-transform infrared spectroscopy (FTIR), thermogravimetry (TG) and differential scanning calorimetry (DSC). Analysis of the results showed strong interactions between the nitrile groups of polyacrylonitrile and polyaniline in the PAN/PANI in situ fibers. The results of mechanical strength tests indicated that the performance of the PAN/PANI mixture significantly improved the mechanical parameters of polyaniline, although these fibers had a weaker strength than the unmodified PAN fibers. The fibers obtained as a result of the addition of PANI to PAN were dielectric, whereas the PANI-synthesized in situ were characterized by a mass-specific resistance of 5.47 kΩg/cm2.

Analysis of Fractional-Order Models Of Polyaniline Doped Polyacrylonitrile Fibres Impedances’ (PAN/PANI)

“…The reason for such differences in the microstructure of fibers may be primarily the difference in the size of the particles that make up both polymers and the amount of fiber stretch obtained in the process of their formation. In addition, as shown in the results of the study 29 , during the synthesis of PANI in the DMF and PAN solution, new interactions between the functional groups of both polymers appeared, which could weaken the interactions between the polyacrylonitrile chains themselves.…”

“…During the completed research works, samples from S1 to S6 were obtained (Table 1). All the samples were fibrous systems of different type, composed of two polymers (polyacrylonitrile and polyaniline) with a different length of polymer chains 29 . In addition, the S1 and S2 samples were subjected to an additional treatment involving soaking in hydrochloric acid (HCl).…”

“…Afterwards, the mixture was deaerated and cooled down to a room temperature. In this way, the spinning solution was ready for doped PAN fibre formation 29 . After the formation of the fibres with 1% of PANI they were soaked in HCl for 20 hours.…”

“…The PAN fibre with polyaniline was prepared by special methods in situ synthesis of polyaniline in a spinning solution 29,30 . The fibres were formed with the 13.5% (w/w) of PAN polymer concentration.…”

Enhanced modification technique for polyacrylonitrile UF membranes by direct hydrolysis in the immersion bath

“…As shown in the FTIR spectrum of the polyacrylonitrile membrane obtained from the pure water coagulation bath, the peaks at 2243 and 1737 cm −1 are related to the stretching vibration of nitrile (CN) and carbonyl (CO) groups in the acrylonitrile and vinyl acetate monomers, respectively . The peaks at 1452 cm −1 and 2938 cm −1 are due to the CH bending and stretching in CH 2 , respectively . The hydrolysis has not generated any new peaks in the spectra, but the peak intensities and the area under the curve have changed for some peaks.…”