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Microstructure of heat-treated PAN nanofibers


A simple and modified electrospinning technique was utilized to prepare aligned and heat treated Polyacrylonitrile nanofibers by using a rotating drum fixed on top of syringe needles and applying upward hot air flow which can facilitate to heat nanofibers in electrospinning zone. Polyacrylonitrile nanofibers were electrospun from its 14 wt% solution in dimethylformamide under practical conditions. Angular power spectrum analysis showed better fiber alignment with increasing take up speed, although SEM studies demonstrated wider diameters of nanofibers being produced by modified method. The glass transition temperature of all prepared samples were determined between 70 °C and 90 °C using DSC technique. The Quantitative analysis of WAXD patterns has revealed the positive effect of modified method on the degree of crystallization of nanofibers heat treated at higher take up speed. The maximum chain orientation factor of 0.27 was determined for nanofibers collected at linear velocity of 114.5 m/min in the modified set up using Raman Spectroscopy technique.

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  1. A. L. Andrady, “Science and Technology of Polymer Science”, pp.83–109, John Wiley & Sons, New Jersey, 2008.

    Google Scholar 

  2. S. Ramakrishna, K. Fujihara, W. E. Teo, T. C. Lim, and Z. Ma, “An Introduction to Electrospinning and Nanofibers”, pp.90–116, World Scientific, Singapore, 2005.

    Book  Google Scholar 

  3. S. F. Fennessey and R. J. Farris, Polymer, 45, 4217 (2004).

    Article  CAS  Google Scholar 

  4. E. Zussman, X. Chen, W. Ding, L. Calabri, D. A. Dikin, J. P. Quintana, and R. S. Ruoff, Carbon, 43, 2175 (2005).

    Article  CAS  Google Scholar 

  5. S. Y. Gu, J. Ren, and Q. L. Wu, Synthetic Metals, 155, 157 (2005).

    Article  CAS  Google Scholar 

  6. H. Pan, L. Li, L. Hu, and X. Cui, Polymer, 47, 4901 (2006).

    Article  CAS  Google Scholar 

  7. S. A. Hoseini and M. Sadrjahani, J. Appl. Polym. Sci., 124, 3529 (2012).

    Article  Google Scholar 

  8. V. B. Gupta and V. K. Kothari, “Manufactured Fiber Technology”, Chapman & Hall, London, 1997.

    Book  Google Scholar 

  9. S. F. Fennessey, Ph.D. Dissertation, UMI, University of Massachusetts Amherst, 2006.

  10. C. M. James, “Acrylic Fiber Technology and Applications”, Marcel Dekker, New York, 1995.

    Google Scholar 

  11. S. Dalton, F. Heatley, and P. M. Budd, Polymer, 40, 5531 (1999).

    Article  CAS  Google Scholar 

  12. C. Lai, G. Zhong, Z. Yue, G. Chen, L. Zhang, A. Vakili, Y. Wang, L. Zhu, J. Liu, and H. Fong, Polymer, 52, 519 (2011).

    Article  CAS  Google Scholar 

  13. J. Liu, G. Chen, H. Gao, L. Zhang, S. Ma, J. Liang, and H. Fong, Carbon, 50, 1262 (2012).

    Article  CAS  Google Scholar 

  14. D. Mathieu and A. Grand, Polymer, 39, 5011 (1998).

    Article  CAS  Google Scholar 

  15. T. Liu and S. Kumar, Chem. Phys. Lett., 378, 257 (2003).

    Article  CAS  Google Scholar 

  16. D. L. Pavia, G. M. Lampman, G. S. Kriz, and J. R. Vyvyan, “Introduction to Spectroscopy: A Guide for Students of Organic Chemistry”, W. B. Saunders Co., Philadelphia, PA, 1979.

    Google Scholar 

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Correspondence to S. A. Hosseini Ravandi.

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Sadrjahani, M., Hosseini Ravandi, S.A. Microstructure of heat-treated PAN nanofibers. Fibers Polym 14, 1276–1282 (2013).

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  • Polyacrylonitrile
  • Electrospinning
  • Heat treatment
  • Molecular orientation
  • Raman spectroscopy
  • X-ray diffraction