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Volume 1978 (1978)
- Issue 95 Pages 135-
- Issue 94 Pages 5-
- Issue 93 Pages 57-
- Issue 92 Pages 2-
Volume 1978, Issue 92
Displaying 1-5 of 5 articles from this issue
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Nobuatsu Watanabe, Hiroyasu Takenaka1978 Volume 1978 Issue 92 Pages 2-6
Published: January 25, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe fluorination processes of flaky natural graphite were studied by means of various microscopies.The optical character of graphite fluoride (CF) n was examined by using conoscope in order to interpret the results obtained for the fluorinated samples by observation under a polarizing microscope.Graphite fluoride belongs to optically uniaxial crystals and its optic character is negative.The principal index ω is 1.543-1.544.Observation between crossed nicols of the fluorinated flaky samples consisting of both a transparent (CF) n layer and an unreacted graphite layer, revealed the ordering of stacking of (CF) n sheets and that the farther the sheets were located from the reaction interface, the more regular the ordering of stacking became.The fluorination of flaky graphite particle proceeds from the periphery toward the interior of the flake.Preferential fluorination took place at twin bands, and impurities on graphite surface, and the cracks produced by stresses due to the formation of (CF) n layer.The above parts of graphite particle were comparable in reactivity with the periphery.Many mechanical destructions such as exfoliation, crack and intumescence were observed in a (CF) n layer, which might be brought about by a large accumulation of internal stresses at the reaction interface.These microscopic observations also indicated that such mechanical destructions allowed fluorine gas to pass through the (CF) n layer to the reaction interface.View full abstractDownload PDF (13964K) -
Isao Mochida, Hiroichi Miyasaka, Hiroshi Fujitsu, Kenjiro Takeshita1978 Volume 1978 Issue 92 Pages 7-16
Published: January 25, 1978
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSThe carbonization properties of aromatic hydrocarbons containing five-membered ring were examined under various conditions to resolve the relation of the properties with the chemical structure, and to investigate the effects of conditions on the features of the mesophase which was formed at the earlier stage of carbonization.The carbonization reactivity decreased in the order of acenaphthylene >> decacyclene > truxene > acenaphthene > fluoranthene≅fluorene.The first three of the hydrocarbons were carbonized at 600°C when the rate of temperature increase was programed to be 150°C/hr.Acenaphthene which was not carbonized under these conditions required a rapid temperature increase of 600°C/hr to give a needle coke.All these hydrocarbons gave needle cokes by the aid of aluminum chloride.The different conditions of carbonization gave different features of the mesophase.Acenaphthylene provided huge spheres and flower petals of anisotropic mesophase under rapid temperature increase (600°C/hr) and refluxing carbonization conditions, respectively.View full abstractDownload PDF (24839K) -
Kazuro Kawamura1978 Volume 1978 Issue 92 Pages 17-18
Published: January 25, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1924K) -
[in Japanese]1978 Volume 1978 Issue 92 Pages 19-27
Published: January 25, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (3690K) -
[in Japanese]1978 Volume 1978 Issue 92 Pages 28-36
Published: January 25, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (13016K)
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