caa a22 4500 467950903 CHVBK 20180322200726.0 cr unu---uuuuu 170328e19861101xx s 000 0 eng 10.1007/BF02431653 doi (NATIONALLICENCE)springer-10.1007/BF02431653 (NATIONALLICENCE)springer-10.1007/BF00553470 The relationship between structure and viscosity of petroleum pitch in the process of mesophase formation [Elektronische Daten] [Kenji Yamada, Hiroshi Fujii, Motowo Takayanagi] A change in the viscosity of a petroleum pitch with heat-treatment time was measured at constant heat-treatment temperature with a capillary viscometer. At heat-treatment temperatures of 673, 723 and 753 K, the viscosity is initially increased with heat-treatment time due to an increase in the average molecular weight of the sample and then decreased by the formation of optically anisotropic spherules, which is also caused by the increase in the average molecular weight. After this decrease the viscosity is increased again by the growth of the spherules. The viscosity of the grown spherules may become higher than that of isotropic phases. With higher heat-treatment temperatures, the viscosity curve showing the above behaviour shifts to the side of the shorter heat-treatment time. The average molecular weight of the sample necessary for the formation of the spherules is higher at higher heat-treatment temperatures. The decrease in the viscosity due to the formation of the spherules took place once the extent of the stacking layers of aromatic hydrocarbons, evaluated from X-ray diffraction, was in the range of 1.41 to 1.47 nm along the stacking direction, independent of the heat-treatment temperature. Chapman and Hall Ltd., 1986 Yamada Kenji Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 812, Fukuoka, Japan aut Fujii Hiroshi Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 812, Fukuoka, Japan aut Takayanagi Motowo Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 812, Fukuoka, Japan aut Journal of Materials Science Kluwer Academic Publishers 21/11(1986-11-01), 4067-4070 0022-2461 21:11<4067 1986 21 10853 https://doi.org/10.1007/BF02431653 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02431653 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yamada Kenji Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 812, Fukuoka, Japan aut NATIONALLICENCE 700 1- Fujii Hiroshi Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 812, Fukuoka, Japan aut NATIONALLICENCE 700 1- Takayanagi Motowo Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 812, Fukuoka, Japan aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers 21/11(1986-11-01), 4067-4070 0022-2461 21:11<4067 1986 21 10853 NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00553470 text/html Onlinezugriff via DOI Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE NATIONALLICENCE NL-springer