Irshad Hussain Wazir et al. /New Carbon Materials, 2009, 24(1): 83-88 fibers shows the highest tensile strength of approximately 650 among all kinds of fibers teste 4 Concluslons Pitch fiber by condensation at 420C for 7 h, which was composed of Precursor pitch 75% mass fraction mesophase and had a carbon yield of ap- proximately 70.5% with a softening point of 295 C. The pre- 102030405060 250 m/min. The precursor pitch contains mesophase spheres 2e/(°) A typical radial core structure was formed in carbon fibers by carbonization at 1000C, which had a tensile strength of 650 Fig 6 XRD profiles of precursor pitch containing mesophase pitch, MPa. The petroleum-based precursor pitch is suitable for the as-spun carbon fiber, stabilized carbon fiber and carbonized carbon The present work is supported by Higher Education 0360 Commission of Pakistan for the promotion of Science [The Grant-in-Aid for Scientific Research Project No. 20-377/R 0355 D/05/1057 0.350 References 0.345 [1] Rebouillate S, Peng J C, Donnet J B, et al. Carbon fibers appli cations[c] Donne J B, Wang T K, Rebouillat S, et al. eds Precursor pitch As-spun Stab. Carb. at 1000'C Carbon Fibers. New York: Marcel Dekker. 1998: 463-540 Temperature frc [2]Deborah D L C Carbon Fiber Composites[M]. Boston: Butter worth-Heinemann. 1994:116 3 Peebles L H. Carbon Fibers Formation, Structure and Proper Fig 7 dooz values of precursor pitch, as-spun, stabilized and carbon- ties[M]. New York: CRC Press, 1998: 3-42 Ized fibers [4] Dyer J, Daul G C Rayon Fibers[Cy/Lewin M, Pearce E M, eds Handbook of Fiber Chemistry. New York: Marcel Dekker 1998:725-801 [5] Oberlin A, Bonnamy S, Lafdi K Structure and textu bers(C)/Bonnet J B, Wang T K, Rebouillat S, et al, eds Carbon Fibers. New York: Marcel Dekker. 1998: 85-159 [6]Otani S, Okuda K, Matsuda H S. Carbon Fiber[M]. Tokyo Kindai Henshu. 1983: 231 [7 Maeda T, Zeng S M, Tokumitsue K, et al. Preparation of iso- tropic pitch precursors for general purpose carbon fibers(GPCF by air blowing- l. Preparation of spinnable isotropic pitch pre- carb.at1000°c cursor from coal tar by air blowing [J]. Carbon, 1993, 31(3) Temperature t/C 407-412 18 Mdada T, Zeng S M, Tokumitsue K. Preparation of isotropic Fig 8 Tensile strength of as-spun stabilized and carbonized carbon pitch precursors for general purpose carbon fibers(GPCF) by air fibers as a function of temperature blowing-lL. Air blowing of coal tar, hydrogenated coal tar, and petroleum pitches). Carbon, 1993, 31(3): 413-419 esophase spheres in spinning, which increased sharply by [9] Mdada T, Zeng S M, Tokumitsue K. Preparation of isotropic the involvement of oxygen during stabilization and increased pitch precursors for general purpose carbon fibers( GPCF) by sharply by carbonization, agreeing well with the previous air blowing-IlI. Air blowing of isotropic naphthalene and hy publications[1-12,261 drogenated coal tar pitches with addition of 3.5 Tensile strength 1, &-dinitronaphthalene[J). Carbon, 1993, 31(3): 421-426 10 WangCY, Li M W, Wu Y L, et al. Preparation and microstruc- The tensile strengths of the as-spun fibers, stabilized fi- ure of hollow mesophase pitch-based carbon fibers J]. Carbon bers. and the carbon fibers are in Fig 8. The carbon 1998,36(12):1749-175Arshad Hussain Wazir et al. / New Carbon Materials, 2009, 24(1): 83–88 Fig.6 XRD profiles of precursor pitch containing mesophase pitch, as-spun carbon fiber, stabilized carbon fiber and carbonized carbon fiber at 1000 o C Fig.7 d002 values of precursor pitch, as-spun, stabilized and carbon￾ized fibers. Fig.8 Tensile strength of as-spun stabilized and carbonized carbon fibers as a function of temperature. mesophase spheres in spinning, which increased sharply by the involvement of oxygen during stabilization and increased sharply by carbonization, agreeing well with the previous publications[11-12, 26]. 3.5 Tensile strength The tensile strengths of the as-spun fibers, stabilized fi￾bers, and the carbon fibers are shown in Fig.8. The carbon fibers shows the highest tensile strength of approximately 650 MPa among all kinds of fibers tested. 4 Conclusions The precursor pitch was prepared from petroleum pitch by condensation at 420 o C for 7 h, which was composed of 75% mass fraction mesophase and had a carbon yield of ap￾proximately 70.5% with a softening point of 295 o C. The pre￾cursor pitch showed good spinnability with a wind up speed of 250 m/min. The precursor pitch contains mesophase spheres. A typical radial core structure was formed in carbon fibers by carbonization at 1000 oC, which had a tensile strength of 650 MPa. The petroleum-based precursor pitch is suitable for the preparation of carbon fibers. Acknowledgment The present work is supported by Higher Education Commission of Pakistan for the promotion of Science [The Grant-in-Aid for Scientific Research Project No. 20-377/R & D/05/1057]. References [1] Rebouillate S, Peng J C, Donnet J B, et al. Carbon fibers appli￾cations[C]// Donnet J B, Wang T K, Rebouillat S, et al. eds. Carbon Fibers. New York: Marcel Dekker, 1998: 463-540. [2] Deborah D L C. Carbon Fiber Composites[M]. Boston: Butter￾worth-Heinemann, 1994: 116. [3] Peebles L H. Carbon Fibers Formation, Structure and Proper￾ties[M]. New York: CRC Press, 1998: 3-42. [4] Dyer J, Daul G C. Rayon Fibers[C]//Lewin M, Pearce E M, eds. Handbook of Fiber Chemistry. New York: Marcel Dekker, 1998: 725-801. [5] Oberlin A, Bonnamy S, Lafdi K. Structure and texture of carbon fibers[C]//Donnet J B, Wang T K, Rebouillat S, et al, eds. Carbon Fibers. New York: Marcel Dekker, 1998: 85-159. [6] Otani S, Okuda K, Matsuda H S. Carbon Fiber[M]. Tokyo: Kindai Henshu, 1983: 231. [7] Maeda T, Zeng S M, Tokumitsue K, et al. Preparation of iso￾tropic pitch precursors for general purpose carbon fibers (GPCF) by air blowing-I. Preparation of spinnable isotropic pitch pre￾cursor from coal tar by air blowing [J]. Carbon, 1993, 31(3): 407-412. [8] Mdada T, Zeng S M, Tokumitsue K. Preparation of isotropic pitch precursors for general purpose carbon fibers (GPCF) by air blowing-II. Air blowing of coal tar, hydrogenated coal tar, and petroleum pitches[J]. Carbon, 1993, 31(3): 413-419. [9] Mdada T, Zeng S M, Tokumitsue K. Preparation of isotropic pitch precursors for general purpose carbon fibers (GPCF) by air blowing-III. Air blowing of isotropic naphthalene and hy￾drogenated coal tar pitches with addition of 1,8-dinitronaphthalene[J]. Carbon, 1993, 31(3): 421-426. [10] Wang C Y, Li M W, Wu Y L, et al. Preparation and microstruc￾ture of hollow mesophase pitch-based carbon fibers[J]. Carbon, 1998, 36(12): 1749-1754