MODIFICATION OF COAL-TAR PITCH BY AIR-BLOWING .1. VARIATION OF PITCH COMPOSITION AND PROPERTIES

被引:92
作者
FERNANDEZ, JJ
FIGUEIRAS, A
GRANDA, M
BERMEJO, J
MENENDEZ, R
机构
[1] Instituto Nacional del Carbon, CSIC, 33080 Oviedo
关键词
COAL-TAR PITCH; AIR BLOWING; CHEMICAL COMPOSITION; PITCH PROPERTIES; PITCH PYROLYSIS; C-C COMPOSITES;
D O I
10.1016/0008-6223(94)00130-R
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Pitch oxidation by air-blowing has been studied as a possible method to modify pitch properties for composite preparation. Two commercial coal-tar pitches, an impregnating pitch and a binder pitch, were air-blown at temperatures between 250-300 degrees C, for 18 and 14 h, respectively, to produce pitches of similar softening point ranging from 148 to 223 degrees C. Parent and treated pitches were characterized by elemental analysis, FTIR, thermal analysis (TMA, TGA, and DTA), solubility in toluene and quinoline, XPS, X-ray diffraction, and optical microscopy. Additionally, parent pitches were also characterized by extrography. Pyrolysis products of parent and treated pitches, obtained at 450 degrees C, were characterized by optical microscopy to monitor the influence of air-blowing on mesophase formation. Results show that pitch modification by air-blowing produces a significant increase in carbon yield, without restricting the fluidity necessary to pitch for impregnation. During air-blowing, the reactions of dehydrogenative polymerization and crossing-linking of oligomers occur.
引用
收藏
页码:295 / 307
页数:13
相关论文
共 25 条
  • [1] CHEMICAL-CHANGES DURING THE MILD AIR OXIDATION OF PITCH
    BARR, JB
    LEWIS, IC
    [J]. CARBON, 1978, 16 (06) : 439 - 444
  • [2] BERMEJO J, 1994, P CARBON 94 GRANADA, P88
  • [3] DUK Y, 1986, J MATER SCI, V21, P424
  • [4] THE FUTURE OF CARBON-CARBON COMPOSITES
    FITZER, E
    [J]. CARBON, 1987, 25 (02) : 163 - 190
  • [5] EVALUATION OF NAPHTHALENE-DERIVED MESOPHASE PITCHES AS A BINDER FOR CARBON CARBON COMPOSITES
    FUJIURA, R
    KOJIMA, T
    KANNO, K
    MOCHIDA, I
    KORAI, Y
    [J]. CARBON, 1993, 31 (01) : 97 - 102
  • [6] APPLICATION OF EXTROGRAPHY FOR CHARACTERIZATION OF COAL-TAR AND PETROLEUM PITCHES
    GRANDA, M
    BERMEJO, J
    MOINELO, SR
    MENENDEZ, R
    [J]. FUEL, 1990, 69 (06) : 702 - 705
  • [7] MASS-SPECTROMETRIC CHARACTERIZATION OF POLYNUCLEAR AROMATIC NITROGEN-COMPOUNDS IN COAL-TAR PITCHES SEPARATED BY EXTROGRAPHY
    GRANDA, M
    MENENDEZ, R
    MOINELO, SR
    BERMEJO, J
    SNAPE, CE
    [J]. FUEL, 1993, 72 (01) : 19 - 23
  • [8] SEMIQUANTITATIVE FTIR ANALYSIS OF A COAL-TAR PITCH AND ITS EXTRACTS AND RESIDUES IN SEVERAL ORGANIC-SOLVENTS
    GUILLEN, MD
    IGLESIAS, MJ
    DOMINGUEZ, A
    BLANCO, CG
    [J]. ENERGY & FUELS, 1992, 6 (04) : 518 - 525
  • [9] HEIN M, 1990, ERDOL KOHLE ERDGAS P, V43, P354
  • [10] KORAI Y, 1993, 21 BIENN C CARB STAT, P334