Abstracts 145 land A2401, at two stages of pyrolysis, has been solventfractionated by successive Soxhlet extractions with solvents such as hexane, cyclohexane, toluene, tetrahydrofuran, and pyridine. The fractions have been coked at room pressure and at 5OOOpsi and evaluated in terms of their mesoph
Quantitative determination of anisotropic domain size in mesophase pitch
β Scribed by R.T. Lewis; I.C. Lewis; R.A. Greinke; S.L. Strong
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 748 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0008-6223
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β¦ Synopsis
The optical texture of the carbonaceous mesophase is related to the nature of the pitch precursor, the mesophase viscosity and mode of preparation. The anisotropic domain size, represented by the distance between extinction lines, has been a useful parameter for characterizing mesophase pitches. A procedure for quantitative determination of mesophase domain size, utilizing annealing techniques and image analysis, is described and applied to several different mesophase pitch systems.
π SIMILAR VOLUMES
Quantitative measurements of the carbonaceous mesophase content of a petroleum pitch, Ashland 240, have been achieved using high-temperature pulsed proton nuclear magnetic resonance ('H NMR) spectroscopy. A simple signal analysis procedure allows the anisotropic (mesophase) and isotropic phases of t
The discovery of mesophase formation in thermallytreated pitches has been crucial to understanding how high-modulus carbon fibres can be produced from pitchbased materials [ 11.
The free N-terminal 30-kDa domain of the fibronectin subunit chains had previously been shown to mediate binding of soluble fibrin to phagocytic cells. In order to demonstrate whether the fragment is available in plasma in a suitable concentration, an indirect immunoassay procedure for its quantitat