Conversion of Modified Commercial Polyacrylonitrile Fibers to Carbon Fibers

Authors: R. Eslami Farsani, A. Shokuhfar, A. Sedghi

Abstract:

Carbon fibers are fabricated from different materials, such as special polyacrylonitrile (PAN) fibers, rayon fibers and pitch. Among these three groups of materials, PAN fibers are the most widely used precursor for the manufacture of carbon fibers. The process of fabrication carbon fibers from special PAN fibers includes two steps; oxidative stabilization at low temperature and carbonization at high temperatures in an inert atmosphere. Due to the high price of raw materials (special PAN fibers), carbon fibers are still expensive. In the present work the main goal is making carbon fibers from low price commercial PAN fibers with modified chemical compositions. The results show that in case of conducting completes stabilization process, it is possible to produce carbon fibers with desirable tensile strength from this type of PAN fibers. To this matter, thermal characteristics of commercial PAN fibers were investigated and based upon the obtained results, with some changes in conventional procedure of stabilization in terms of temperature and time variables; the desirable conditions of complete stabilization is achieved.

Keywords: Modified Commercial PAN Fibers, Stabilization, Carbonization, Carbon Fibers.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1058913

References:

[1] P. J. Walsh, ASM Handbook-Composites. Ohio: ASM International, 2001, pp. 49-53.
[2] V. I. Kostikov, Fiber Science and Technology. London; Chapman and Hall, 1995.
[3] S. S. Chair, O.P. Bahl, and R. B. Mathur, "Characterization of acrylic fibers used for making carbon fibers", Fiber Science and Technology, vol. 15, pp. 153-160, 1981.
[4] J. C. Masson, Acrylic Fiber Technology and Applications. New York: Marcel Dekker, 1995.
[5] P. Rajalingam, and G. Radhakrishnan, "Polyacrylonitrile precursor for carbon fibers", JMS-Rev. Macromol. Chem. Phys., C31, p. 301, 1991.
[6] O. P. Bahl, and L. M. Manocha, "Development of high performance carbon fibers from PAN fibers", Chemical Age of India, vol. 38, p. 181, 1987.
[7] D. D. Edie, "The effect of processing on the structure and properties of carbon fibers", Carbon, vol. 36, p. 345, 1998.
[8] R. Eslami Farsani, A. Shokuhfar, and A. Sedghi, "Carbon fiber production based on commercial polyacrylonitrile fibers of wet formation", Fiber Chemistry, vol. 38, pp. 383-386, 2006.
[9] K. K. Garg, "Poly-acrylonitrile and copolymers", Synthetic Fibers, Apr. /Jun., p. 29, 1985.
[10] D. C. Gupta, "Acrylic fibers-polymerization", Synthetic Fibers, Oct. /Dec., p. 14, 1984.
[11] D. Spaseska, Influence of precursor prehistory on carbon fiber characteristics, Faculty of Technology and Metallurgy, University Kiril and Metodij, Skopje, Yugoslavia, pp. 149-159.
[12] W. Sweeny, "Cyclization of acrylic fiber", EP. No. 0169690 B1, 1989.
[13] M. T. Azarova, A. A. Konkin, and V. M. Bondarenko, "Study of thermal conversions of polyacrylonitrile fibers", International Symposium on Chemical Fibers, USSR, 1974, p. 56.
[14] R. C. Bansal, and J. B. Donnet, Comprehensive Polymer Science: Polymer Reactions. Oxford: Pergamon Press, 1990.
[15] E. Fitzer and W. Frohs, "The influence of carbonization and post treatment conditions on the properties of PAN - based carbon fibers", International Carbon Conference, U.K., 18-23 Sept. 1988, pp. 298-300.
[16] E. Fitzer, "PAN based carbon fibers - present state and trend of the technology from the viewpoint of possibilities and limits to influence and to control the fiber properties by the process parameters", Carbon, vol. 27, pp. 621-645, 1989.