Characteristics of Coal Tar Pitch-Based Mesophase Separated by High-Temperature Centrifugal Method

Autor:	S.J. In, Bo-Sung Rhee, Cheol Kim, Y.G. Jo, Seung-Kon Ryu
Rok vydání:	1992
Předmět:	Coalescence (physics) Thermogravimetric analysis Materials science Chemical engineering Phase (matter) Isotropy Mesophase Atomic ratio SPHERES Crystallite Composite material
Zdroj:	TANSO. 1992:411-416
ISSN:	1884-5495 0371-5345
DOI:	10.7209/tanso.1992.411
Popis:	Mesophase pitches which have different amount of mesophase were prepared and separated into mesophase and isotropic phases by a high-temperature centrifugal method . Properties of mesophase during formation, growth, and coalescence of mesophase spheres were investigated by measuring the solubility, density, X-ray diffraction, and thermogravimetric analysis.QI was the main component of smaller mesophase spheres, and the β-resin of the isotropic matrix contributed to the growth of spheres. The density and C/H atomic ratio of mesophase were nearly constant at 1.385 g/cm3 and 2.00, respectively, during heat-treatment. The amount of functional groups of bigger spheres was larger than smaller spheres or bulk phase . Bigger spheres have better crystallite structure than smaller spheres or bulk phase.
Databáze:	OpenAIRE
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