2021 Fiscal Year Final Research Report
Internal strain analysis in bent soft material by a cholesteric liquid crystal elastomer
Project/Area Number |
20K15339
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Research Category |
Grant-in-Aid for Early-Career Scientists
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Allocation Type | Multi-year Fund |
Review Section |
Basic Section 35020:Polymer materials-related
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Research Institution | Tokyo Institute of Technology |
Principal Investigator |
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Project Period (FY) |
2020-04-01 – 2022-03-31
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Keywords | コレステリック液晶 / フィルムデバイス / 湾曲 / 中立面 |
Outline of Final Research Achievements |
In this work, the author quantified internal strain in a bending soft material using a cholesteric liquid crystal (CLC) sensor to identify the neutral mechanical plane (NMP) position. CLC has a helical molecular structure and exhibits selective reflection according to the helical pitch. By utilizing the reflection wavelength shift with the change in the helical pitch of CLC, the author measured the internal strain of a polydimethylsiloxane (PDMS) film, which is a soft material commonly used in flexible devices. Specifically, the CLC sensor was embedded in various positions of PDMS films to measure the internal strain distribution. Furthermore, mechanically durable device was designed by considering the NMP shift.
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Free Research Field |
高分子材料工学
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Academic Significance and Societal Importance of the Research Achievements |
現在のフレキシブルデバイス開発のアプローチは,湾曲に伴うひずみに追従する高伸縮な物質材料の開発と薄型化によるひずみ軽減の2つに大きく分類される。本研究では,湾曲によって生じる内部ひずみの定量解析に着目し,ひずみの分布を明らかにした。さらに,湾曲に伴う中立面の移動を追跡することで,ひずみ分布に応じた性能劣化しないフィルムデバイスの創製に成功した。このように,内部ひずみの実測に基づく高耐久フィルムデバイス開発は,学術的にも意義深い。内部のひずみ分布から中立面の移動挙動を詳細に理解し,高性能フィルムデバイスを設計できれば,エレクトロニクスのみならずソフトロボティクス,生体材料への波及効果も大きい。
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