Grant-in-Aid for International Scientific Research.
|Section||Joint Research .|
Inorganic materials/Physical properties
|Research Institution||Hokkaido University|
INAGAKI Michio Hokkaido University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (20023054)
王 正徳 清華大学, 材料系, 助教授
BONNAMY Sylv 微粒子研究所, 主任研究員
KOTOSONOV Al 国立グラファイト研究所, 教授
TAKEICHI Tsutomu Toyohashi University of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (90126938)
HISHIYAMA Yoshihiro Musashi Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (90061499)
BONNAMY Syiv 微粒子研究所, 主任研究員
BONNAMY S 微粒子研究所, 主任研究員
KOTOSONOV A 国立グラファイト研究所, 教授
KOTOSONOV A. National Institute of Graphite, Professor
BONNAMY S. Center de Recherche sur la Matiere Divisee, Maitre de Recherch
|Project Fiscal Year
1995 – 1997
Completed(Fiscal Year 1997)
|Budget Amount *help
¥4,900,000 (Direct Cost : ¥4,900,000)
Fiscal Year 1997 : ¥1,400,000 (Direct Cost : ¥1,400,000)
Fiscal Year 1996 : ¥1,700,000 (Direct Cost : ¥1,700,000)
Fiscal Year 1995 : ¥1,800,000 (Direct Cost : ¥1,800,000)
|Keywords||Graphite / Film / Polyimide / Crystallinity / Boron / Iron / Structure / Doping / グラファイト / フィルム / ポリイミド / 結晶性 / ボロン / 鉄 / 構造 / ド-ピング / 結晶完全性 / X線回折 / 磁気抵抗 / ホール係数 / フイルム / 電子チャンネリングコントラスト|
The development of graphite structure (Graphitization)
Highly crystallized graphite films were confirmed to be obtained from some polyimide films by satisfying the following three conditions ; flatness of polyimide molecules, high degree of orientation of thses molecules and less disturbance in orientation during the heat treatment (carbonization and graphitization) . It was found that nitrogen remained in the resultant carbon films by substituting carbon atoms in hexagonal carbon layrs up to the heat treatment of 2200 ﾟC and its presence affects on the development of graphite structure and galvanomagnetic properties in the carbon films. The effect of heating rate during carbonization was compared on various precursors.
Imprevement of molecular orientation and graphitizability
In order to improve the orientation of plyimide molecules, cold-drawing of films and esterification of molecules were tried.
Uniaxial cold-drawing of the film during imidization was found to improve the molecular ori
entation in polyimide films, but at the same time axial orientation scheme was found to be introduced, and, as a consequence, graphitization in the films was perturbed.
The esterification was effective to improve the molecular orientation in polyimde films and also the graphitizability of the films by the heat treatment at high temperatures. Fundamental chemistry on the esterification of plyimide molecules and the synthesis of urathane-imide copolymers was studied in detail.
Function development of graphite films
The quality of the graphite films obtained from polyimides were evaluated by different techniques, X-ray diffraction, optical microscopy, transimission electron microscopy, scanning electron microscopy, electron channeling contrast and measurements of galvanomagnetic and magnetic properties and compared with kish graphite precipitated from molten iron, carbon nanotube and cokes.
Galvanomagnetic properties of graphite filmjs obtained from polyimides were markedly improved by the intercalation of MoC15 and the experimental results were compared with those on the incorporation of iron into kish graphite and on the fluorination and lithiation of carbon nanotube. Less