权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Tailoring of Graphite Films-Control of Structure and Functions-

石墨薄膜的剪裁-结构和功能的控制-

基本信息

批准号：
07044109
负责人：
INAGAKI Michio
金额：
$ 3.14万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

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 graphitizabilityIn 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 … More 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 filmsThe 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

石墨结构的发展(石墨化)某些聚酰亚胺薄膜满足以下三个条件：聚酰亚胺分子的平坦性、分子的高度取向度和热处理(碳化和石墨化)过程中的取向扰动，从而获得高结晶的石墨膜。结果表明，在2200ﾟC热处理前，通过取代六方碳层中的碳原子，生成的碳膜中残留有氮，它的存在对碳膜中石墨结构的发展和电磁场性能有影响。为了提高聚酰亚胺分子的取向度，进行了薄膜的冷拉伸和分子的酯化实验，发现亚胺化过程中薄膜的单轴冷拉伸能提高分子的…酯化反应有效地改善了聚酰亚胺薄膜的分子取向，并通过高温热处理提高了薄膜的石墨化能力。对聚酰亚胺分子的酯化反应和合成铀烷-酰亚胺共聚物的基础化学进行了详细的研究。石墨膜的功能发展通过不同的技术、X射线衍射、光学显微镜、透射电子显微镜、扫描电子显微镜、电子沟道对比以及电流磁和磁性能的测量来评价由聚酰亚胺制备的石墨膜的质量，并与从铁水、碳纳米管和铁芯中沉淀出来的Kish石墨进行了比较。通过MoC15的嵌入显著改善了聚酰亚胺石墨膜的电磁场性能，并与铁掺入Kish石墨和碳纳米管的氟化和锂化实验结果进行了比较。较少