| Project/Area Number |
18K04728
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 26030:Composite materials and interfaces-related
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| Research Institution | Ehime University |
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Principal Investigator |
Yasuda Kazunori 愛媛大学, 理工学研究科(工学系), 教授 (80239756)
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| Project Period (FY) |
2018-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2019: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Keywords | セルロースナノファイバー / 流動誘起配向 / 高分子 / レオロジー / 配向制御 / 流動複屈折 / 繊維配向 / レオロジー特性 / ナノファイバー / 複合材料 / 流動 / 成形 |
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| Outline of Final Research Achievements |
The flow of the fluid in which cellulose nanofibers (CNF) were suspended in water and the orientation state of CNF caused by the flow were investigated.
First, when a polymer was dilutedly added to CNF and the effect of the polymer on the orientation state was investigated, it was found that the orientation state differs depending on the type of polymer. Next, when the orientation states in a complex flow: such as an abrupt contraction flow, an abrupt expansion flow, and flow around a cylinder were investigated, the orientation states of CNF changed greatly depending on the flow. Although it is usually difficult to control the orientation state arbitrarily, in this study, it was possible to control the orientation state of CNF using a rapidly contracting flow field.
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| Academic Significance and Societal Importance of the Research Achievements |
セルロースナノファイバー（CNF）は注目度の高い材料であるが，流体力学的な観点からの研究は少ない。CNFは細長い短繊維形状をしており，流動中の配向状態を調べる研究はとくに少ない。本研究はその先駆け的研究である。マクロサイズの短繊維の配向状態は過去によく研究されていたが，CNFのようなナノスケールサイズの繊維の配向状態は温度に影響され，添加する高分子が希薄であっても高分子の種類によっては配向状態が変化することが明らかとなった。これらの結果は，CNFを用いた成形品などを製造するにあたっての基礎的な知見となるものと期待できる。
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