巻号一覧
1986 巻 (1986)
- 127 号 p. 157-
- 126 号 p. 89-
- 125 号 p. 45-
- 124 号 p. 2-
1986 巻, 127 号
選択された号の論文の9件中1～9を表示しています
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木下 瑞穂, 奥野 敬, 橋本 寿正, 高久 明1986 年 1986 巻 127 号 p. 157-161
発行日: 1986/10/25
公開日: 2010/06/28
ジャーナル フリーIt is attempted to produce carbon films having high strength and toughness from thin polymer film by heat treatment. Poly (α-chloroacrylonitrile) was chosen as starting material and pyrolized at various temperatures up to 1200°C. In order to investigate the characteristics of such carbonized films, mechanical properties, electrical conductivity and infared absorption spectra were measured. The film obtained by 1300°C showed relatively high tensile strength of about 370 MPa which was seven times as large as the strength of the untreated polymer. It is concluded that poly (α-chloroacrylonitrile) is a successful raw material for making high preformance carbon films.抄録全体を表示PDF形式でダウンロード (655K) -
大谷 杉郎, 子洪 〓, 太田 悦郎1986 年 1986 巻 127 号 p. 162-170
発行日: 1986/10/25
公開日: 2010/06/28
ジャーナル フリーThermosetting resins named COPNA resin were prepared by heating polycondenced armotic compounds (Aro) with 1, 4-benzenedimethanol (PXG) and p-toluensulfonic acid as a catalyst. Aro used were pyrene/phenanthrene (7/3 in molar ratio) mixture (PP), napth-alene and coal-tar pitch. The COPNA resins were heat-treated between 200 and 2500°C to examine their carbonization behaviors. Major/results obtained are:
(1) The COPNA resins derived from PP or naphtalene with an amount of PXG above 1.0 in PXG/Aro molar ratio decomposed first thermally around 450°C. Thus, the methylene bridges in the COPNA resins were broken down around 450°C. The pitch-based COPNA resin exhibited the weight loss over a wider temperature range.
(2) Carbon yields from the COPNA resins increased with both increasing, molecular weight of raw Aro and the cross-linkage density. They were 38 and 60 wt% for the naphthalene (PXG/Aro=1.25 in molar ratio) based-and the pitch (PXG/Aro=2.0 in molar ratio) based-COPNA resins respectively. The PP-based one showed an intermediate value between them.
(3) The COPNA resins after heating to 2500°C gave X-ray parameters corresponding to those for the non-graphitizable carbon. hitizability of those resins improved with the increasing molecular weight of Aro and/or the decreasing molecular ratio of PXG/Aro.抄録全体を表示PDF形式でダウンロード (1157K) -
小島 昭, 大谷 杉郎, 古川 茂, 今西 正, 小野 勝, 安保 英司1986 年 1986 巻 127 号 p. 171-177
発行日: 1986/10/25
公開日: 2010/06/28
ジャーナル フリーIt was tried to prepare a carbon fiber reinforced cement (CFRC) plates (5-10 mm in thickness) by use of the two kinds of cements and a PAN based high performance carbon paper. In order to prepare the CFRC plates, 10-25 sheets of the carbon papers impregnat-ed with portland or alumina cement paste were laminated, and then placed in water for curing.
The following processing factors, (1) the particle size of cement powder, (2) the setting time of cement, and (3) fine grinding of cement paste by the “Paste mixier”, were investigated to clarify their effects on the mechanical properties of the obtained CFRCs. The CFRC (4.6 vol% in CF contents) plate from alumina cement exhibited 18 times in the flexural strength and 300 times in the fracturing strain energy compared with the alumina cement plate without carbon paper. The flexural strength of the CFRC plate by use of alumina cement which is characterized by fine particle size and faster setting time, was larger than that in case of portland cement.
Use of the both cement pastes previously treated by the “Paste mixier” to disperse the coagulated cement particles resulted in a remarkable improvement of flexural strength of the obtained CFRCs.抄録全体を表示PDF形式でダウンロード (4574K) -
斎藤 保, 今井 久1986 年 1986 巻 127 号 p. 178-182
発行日: 1986/10/25
公開日: 2010/06/28
ジャーナル フリーThe thermal expansion coefficient of polycrystalline graphite was formulated in terms of the single crystal values and the preferred orientation of individual crystallites on the assumption that a part of lattice expansion can be accommodated by the micro-cracks in sample. This model was checked for 10 brands of nuclear graphites, and an improved formula was proposed for the thermal expansion coefficient of bulk graphite.
The previous formula included a temperature indenpendent factor named “accommodation coefficient” which is defined as amount of contribution of lattice expansion coefficient to bulk sample. But a temperature dependency was observed for this factor measured between 20°C and 900°C. Instead of the relief rate, we have assumed a temperature independency on the relief quantity of littice expansion coefficient.This new formula was found to be in better agreement with the experimental results obtained over a range of temperature up to 900°C抄録全体を表示PDF形式でダウンロード (575K) -
Kunio Esumi, Masaaki Sugiura, Toshiaki Mori, Kenjiro Meguro, Hidemasa ...1986 年 1986 巻 127 号 p. 183-185
発行日: 1986/10/25
公開日: 2010/06/28
ジャーナル フリーA surface treatment of meso-carbons was conducted by using plasma of oxygen, nitrogen, and ammonia and was characterized by means of FTIR-PAS, FTIR-ATR, zeta potential, and heat of immersion techniques. From FTIR-PAS and FTIR-ATR measurements, it was found that the carboxyl groups were formed by the oxygen plasma, while the amino groups were produced by ammonia and nitrogen plasma. The isoelectric point of the mesocarbons treated by the oxygen plasma was shifted to lower value, but that by the ammonia and nitrogen plasma to higher value. Further, the heat of immersion in water for the plasma treated meso-carbons increased due to formaion of hydrophilic groups.抄録全体を表示PDF形式でダウンロード (342K) -
大谷 杉郎1986 年 1986 巻 127 号 p. 186-195
発行日: 1986/10/25
公開日: 2010/06/28
ジャーナル フリーName of “the new materials” is applied to the compounds having the properties which are far above the level of conventional materials. In general the new materials are necessarily prepared by the new procedure and their chief use is in fields of the advanced techonology.
The great majority of preparation procedures used for the new carbon materials is application of the techniques which have developed in the fields of composite materials, chemical vapor deposition, polymer shaping and chemical synthesis. While, the new carbon materials are used in space technology, electroengineering, biotechnology and fine chemistry. Among them, the application of chemical synthesis techniques to carbon preparation is thought to be most interesting investigation in which there is still great room for development.
One of the typical example on the application of chemical synthesis techniques to carbons is the Condensed-Polynucler-Aromatic (COPNA) resin prepared from condensed aromatic compounds though the couppling reaction with p-xylylene glycol. This new resin is not only interesting resin itself, but also interesting precursor of carbon.抄録全体を表示PDF形式でダウンロード (1444K) -
稲垣 道夫, 村松 一生1986 年 1986 巻 127 号 p. 196-206
発行日: 1986/10/25
公開日: 2010/06/28
ジャーナル フリーSynthesis, structure and properties of ternary graphite intercalation compound s containing organic molecules are reviewed. Synthesis processes are classified into three: ternarization of binary compounds, reaction between graphite and metal ions in organic solvent and electrolysis in organic solutions. Ternary compounds containing benzene and tetrahydrofurane are especially discussed.抄録全体を表示PDF形式でダウンロード (1486K) -
今村 健, 山田 泰弘, 本田 英昌1986 年 1986 巻 127 号 p. 207-210
発行日: 1986/10/25
公開日: 2010/06/28
ジャーナル フリーAn instrument for the measurement of the diameter of carbon fiber according to the procedure of JIS. R7601 was developed. This procedure is based upon the interference diffraction pattern of He-Ne laser with a carbon fiber. The instrument is described and the outline of the measuring procedure is given.抄録全体を表示PDF形式でダウンロード (366K) -
山添 宏1986 年 1986 巻 127 号 p. 211-218
発行日: 1986/10/25
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (1118K)
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