成果報告書詳細
管理番号20150000000400
タイトル*平成26年度中間年報 革新的新構造材料等研究開発 研究開発項目(7)革新炭素繊維基盤技術開発
公開日2016/4/1
報告書年度2014 - 2014
委託先名国立大学法人東京大学
プロジェクト番号P14014
部署名電子・材料・ナノテクノロジー部
和文要約
英文要約Title: Japanese National Project to Research and development item 7 "Basic R&D for Carbon Fiber Innovation " (FY2014ーFY2015)FY2014 Annual Report

In this fundamental technology development in FY2014, following three themes of the research and development have been carried out.

(1) Development of new carbon fiber precursor
To achieve the aims of the project, it is required to develop new precursor polymers which give high performance carbon fibers without flame proofing process.
In FY2014, we tried to increase the tensile modulus and elongation of carbon fibers from the precursor. As a result, we achieved the tensile modulus more than 200GPa, the elongation has reached the target (1.5%), obtained in a tensile test measured by the standard test method. Further improvement of performance of carbon fiber has been obtained, being required to be enlarged by the improvement of the fabrication process of precursor fibers. Also, the optimization of the synthesis process was studied in order to obtain stable quality. In order to improve the efficiency of carbon fiber production, reeling conditions for the carbon fiber have been studied.

(2) Analysis of carbonization mechanism; Development of carbonization process by microwave heating
Regarding to the carbonization mechanism, the electromagnetic characteristic of the continuous filament yarns was measured as the absorption and the penetration. The morphoses of the graphite structure were compared between the microwave irradiation and the conventional method. Correlations between the thermal record and carbon composition were collected for the information about the absorption process of microwave energy. As well as promoting the correlation study of the formation process of carbon structure and the mechanical properties of the carbon fibers, the optimization of verification and carbonization technology conditions required for stabilization of the carbonization process by microwave were studied. As a result, a prospect to stable operation of microwave carbonization furnace was obtained.
For plasma surface treatment, the processing conditions were optimized in order to add homogeneous and appropriate functional groups to the carbon fiber surface.

(3) Development of evaluation methods of carbon fibers and standardization
According to the drafts created from FY2014, the standard drafts of test evaluation method were studied. We have tried development of monofilament mechanical tests to assess anisotropic properties of carbon fibers. Some effects of texture and structure of carbon fibers on anisotropic properties are discussed from the moduli and strengths obtained by the developed tests. In last year, we proposed the drafts of torsional, transversal compression and three-point bending test procedures. Using various kinds of carbon fibers, the monofilament test data accumulation was carried out in this year.
The committee was established for reinforced fiber and composite material standardization and the draft for the standardization has been discussed. As well as promoting the study of evaluation methods for the interfacial adhesion, we started to evaluate the basic physical properties of the developed carbon fiber reinforced composites.
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