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Microstructure Modification and Electrical Conductivity Development in PA6/PS Blend using PANI Coated CNT

Soleimani, Elahe | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56540 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Bagheri, Reza
  7. Abstract:
  8. In this research, a nanocomposite blend of polyamide 6/polystyrene containing polyaniline-coated carbon nanotubes was fabricated via melt blending method, aiming to achieve electrical conductivity in the range of static dissipation. The effect of weight percentage of nanofillers and surface modification of carbon nanotubes with polyaniline on the electrical properties and microstructure of the nanocomposite was investigated. To promote compatibility between the immiscible polyamide 6 and polystyrene polymers, PS-g-MA compatibilizer was utilized, and its effect on the morphology of the nanocomposite blend was examined. Additionally, the influence of weight percentage of nanofillers and the use of polyaniline coating were examined. The polyaniline-modified carbon nanotubes were characterized using TGA, Fourier-transform infrared spectroscopy (FTIR), and Raman spectroscopy, while the compatibility of PS-g-MA was investigated through titration and FTIR analysis. Furthermore, the morphology, dispersion of nanofillers, and preferred phase location of the nanofillers were examined by field emission scanning electron microscopy (FESEM), revealing that although the use of polyaniline coating leads to partial agglomeration of the additives, it improves the electrical conductivity. Moreover, microscopic images and solvent test demonstrated that the preferred phase of the nanofillers is polyamide 6. According to the electrical conductivity test, an increase in the weight percentage of nanofillers and the utilization of polyaniline coating result in enhanced electrical conductivity, with resistivity ranging from 106 to 1010 ohm.cm in the static dissipation range. The effect of increasing the amount of nanofillers on the mechanical properties was also examined. The impact of increasing the amount of nanofillers on the mechanical properties was also examined. Additionally, the effect of polyaniline coating on the formation of an epitaxial layer on carbon nanotubes was investigated. It was observed that the use of polyaniline coating and an increase in the percentage of nanofillers led to a reduction in the amount of transcrystalline layer on carbon nanotubes, resulting in improved electrical conductivity. Differential scanning calorimetry (DSC) was employed to study the crystallization behavior of the samples and the extent of the epiyaxial layer on carbon nanotubes. The presence of only the α-crystalline phase in the samples was confirmed by X-ray diffraction (XRD) analysis
  9. Keywords:
  10. Polyamide 6 ; Carbon Nanotubes ; Polyaniline ; Electrical Conductivity ; Electrical Conductive Nanoblends ; Polyamide 6/Polystyrene (PA6/PS)Nanoomposite Blend ; Field Emission Scanning Electron Microscopy (FESEM)

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