Polymer(Korea) (폴리머)

The Polymer Society of Korea (한국고분자학회)
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Kinetic Study of Cyclization of High-Tacticity Polyacrylonitrile Heat-Treated under Air Atmosphere via XRD

공기분위기 하에서 열처리된 고입체 규칙성 폴리아크릴로니트릴의 XRD에 의한 환화반응 속도 연구

  • Xu, Zhi-Xian (Anyang Normal College) ;
  • Xu, Jing (State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology) ;
  • Xu, Liang-Hua (State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology) ;
  • Dai, Yong-Qiang (State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology) ;
  • Xue, Li-Wei (State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology) ;
  • Jin, Ri-Guang (State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology)
  • Published : 2008.03.31
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Abstract

Two different polyacrylonitrile samples (PANs, triad tacticity fraction is 0.25 and 0.64) were synthesized and used to study the kinetics of cyclization. Polymers were treated at different temperatures between 250 to $300^{\circ}C$ under air atmosphere, and analyzed by X-ray diffractometer. The sharp and strong peak at $2{\theta}=16.5^{\circ}$ corresponds to a lateral repeat distance that is the (100) diffraction in hexagonal lattice, while the peak at $2{\theta}=25.5^{\circ}$ reflects the (101) diffraction. In comparing their areas of different heat treated samples, the cyclization of both PANs was identified as a first-order reaction. The rate constants of cyclization reaction at different temperatures and the active energy parameter were obtained. This results might provide an important effect on pre-oxidation of polyacrylonitrile fiber.

Keywords

References

  1. O. P. Bahl, R. B. Mathur, and K. D. Kundra, Fibre Sci. Technol., 15, 147 (1981) https://doi.org/10.1016/0015-0568(81)90067-1
  2. D. D. Edie, Carbon, 36, 345 (1998) https://doi.org/10.1016/S0008-6223(97)00185-1
  3. V. A. Bhanu, P. Rangarajan, K. Wiles, M. Bortner, M. Sankarpandian, and D. Godshall, Polymer, 43, 4841(2002) https://doi.org/10.1016/S0032-3861(02)00330-0
  4. T. S. Tsai and C. H. Lin, J. Appl. Polym. Sci., 42, 3045 (1991) https://doi.org/10.1002/app.1991.070421124
  5. W. M. Thomas and J. J. Pelon, J. Polym. Sci., 13, 329 (1954) https://doi.org/10.1002/pol.1954.120137003
  6. E. Maslowski and A. Urbanska, Am. Text Intern., 5, FW 6-8 (1989)
  7. P. Rangarajan, V. A. Bhanu, D. Godshall, G. L. Wilkes, J. E. Mcgrath, and D. G. Baird, Polymer, 43, 2699 (2002) https://doi.org/10.1016/S0032-3861(02)00077-0
  8. J. S. Tsai, J. Mater. Sci. Lett., 12, 1911 (1993) https://doi.org/10.1007/BF00882539
  9. O. P. Bahl and L. M. Manocha, Carbon, 12, 417 (1974) https://doi.org/10.1016/0008-6223(74)90007-4
  10. W. Watt, Carbon, 10, 121 (1972) https://doi.org/10.1016/0008-6223(72)90036-X
  11. X. Zhixian and J. Riguang, Journal of Beijing University of Chemical Technology, 34, 608 (2007)
  12. X. Zhixian and J. Riguang, J. Appl. Polym. Sci., (waiting publish)
  13. M. G. Dunham and D. D. Edie, Carbon, 30, 435 (1992) https://doi.org/10.1016/0008-6223(92)90042-U
  14. I. Noh and H. Yu, J. Polym. Sci.; Part B: Polym. Lett., 4, 721 (1966) https://doi.org/10.1002/pol.1966.110041011
  15. K. Morita, H. Miyachi, and T. Hiramatsu, Carbon, 19, 11 (1981) https://doi.org/10.1016/0008-6223(81)90099-3
  16. J. N. Hay, J. Polym. Sci., A-1, 6, 2127 (1968) https://doi.org/10.1002/pol.1968.150060810
  17. E. Fitzer and D. J. Muller, Carbon, 13, 63 (1975) https://doi.org/10.1016/0008-6223(75)90259-6
  18. K. Kamide, H. Ono, and K. Hisatani, Polym. J., 24, 917 (1992) https://doi.org/10.1295/polymj.24.917
  19. Y. Nakano and K. Hisatani, Polym. Inter., 35, 207 (1994) https://doi.org/10.1002/pi.1994.210350211
  20. Y. Nakano, K. Hisatani, and K. Kamide, Polym. Inter., 35, 249 (1994) https://doi.org/10.1002/pi.1994.210350306
  21. Y. Nakano, K. Hisatani, and K. Kamide, Polym. Inter., 35, 397 (1994)
  22. Y. Nakano, K. Hisatani, and K. Kamide, Polym. Inter., 36, 87 (1995) https://doi.org/10.1002/pi.1995.210360112
  23. K. E. Perepelkin, Fibre Chem., 35, 409 (2003) https://doi.org/10.1023/B:FICH.0000020769.42823.31
  24. H. Hu, X-ray diffraction technology, Textile Industrial Company, China, p 43 (1988)
  25. C. R. Bohn, J. R. Schaefgen, and W. O. Slatton, J. Polym. Sci., 55, 531 (1961) https://doi.org/10.1002/pol.1961.1205516212
  26. D. Renjith, C. P. R. Nair, P. Sivadasan, and K. N. Ninan, Polym. Int., 54, 1110 (2005) https://doi.org/10.1002/pi.1811
  27. G. Zhao and B. Chen, J. Appl. Sci., 6, 278 (1988) https://doi.org/10.1002/app.1962.070062105