• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Characterization of the soft elasticity of liquid crystal elastomers by various stretching modes

Research Project

Project/Area Number 18H02034
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 35020:Polymer materials-related
Research InstitutionKyoto Institute of Technology

Principal Investigator

Urayama Kenji  京都工芸繊維大学, 材料化学系, 教授 (20263147)

Co-Investigator(Kenkyū-buntansha) 小椎尾 謙  九州大学, 先導物質化学研究所, 准教授 (20346935)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2020: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2018: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Keywords液晶エラストマー / 液晶高分子 / 高分子液晶 / エラストマー / ゴム / 液晶 / 力学物性 / レオロジー
Outline of Final Research Achievements

Liquid crystal elastomers (LCE) exhibit a characteristic mechanical property called "soft elasticity" as a result of the coupling between liquid crystal orientation and rubber elasticity. We have revealed the unusual feature of mechanical properties by biaxial stretching of polydomain LCE membranes: The true stresses in the two orthogonal directions are equalized and a function of only the thickness variation (or only area strain of loading plane), independent of the combination of the two orthogonal strains. The wide-angle X-ray scattering measurements confirm that the imposed biaxial strain drives the realignment of local nematic order. The results signifies that the polydomain LCE membranes behave like as a liquid under biaxial loading.

Academic Significance and Societal Importance of the Research Achievements

一般的に,力学異方性のないゴムを直交する2方向に伸長すると,真応力(変形状態の断面積あたりの荷重)はひずみの大きい方向の方が大きくなる。液晶ドメインがランダム配向したポリドメイン液晶エラストマーに二軸伸長すると,2方向のひずみの組み合わせに関係なく,2方向の真応力が均等化されるという特異な性質を見出した。また,この真応力の大きさは膜厚方向のひずみ(もしくは荷重面の面積ひずみ)のみで決まっていることも明らかにした。この結果は,ポリドメインLCE膜が二軸荷重下で液体的な挙動を示すことを意味している。この性質により,ポリドメインLCE膜は皺が発生しにくい膜の素材としての応用も期待できる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (14 results)

All 2021 2020 2019 2018 Other

All Int'l Joint Research (2 results) Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (8 results) (of which Int'l Joint Research: 3 results,  Invited: 5 results) Book (2 results)

  • [Int'l Joint Research] University Texas A&M(米国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] California Institute of Technology(米国)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Effect of Stretching Angle on Stress Plateau Behavior of Main-Chain Liquid Crystal Elastomers2021

    • Author(s)
      Okamoto, S., Sakurai, S., Urayama, K.
    • Journal Title

      Soft Matter

      Volume: 17 Issue: 11 Pages: 3128-3136

    • DOI

      10.1039/d0sm02244f

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Supersoft Elasticity and Slow Dynamics of Isotropic-Genesis Polydomain Liquid Crystal Elastomers Investigated by Loading and Strain Rate Controlled Tests2020

    • Author(s)
      Takebe, A., Urayama, K.
    • Journal Title

      Physical Review E

      Volume: 102 Issue: 1

    • DOI

      10.1103/physreve.102.012701

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] 液晶配向とゴム弾性のカップリングが生む液晶エラストマーの特異な力学挙動2021

    • Author(s)
      浦山健治
    • Organizer
      日本レオロジー学会・高分子加工技術研究会(第92回例会)
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Multiaxial Deformation and Crack Growth of Elastomers and Gels2021

    • Author(s)
      Kenji Urayama
    • Organizer
      International Webinar on Gels and Networks
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] モノドメイン主鎖型液晶エラストマーの二軸伸長特性2020

    • Author(s)
      岡本鈴佳・川床亮輔・鄭朝鴻・小椎尾謙・高原淳・Adrian Avendano-Bolivar・Taylor Ware
    • Organizer
      2020年日本液晶学会オンライン研究発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 液晶エラストマーのねじり変形下の特異な法線応力効果2019

    • Author(s)
      岡本鈴佳・竹部朝香・浦山健治
    • Organizer
      第 67 回レオロジー討論会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 異なる初期配向の主鎖型液晶エラストマーの伸長特性2019

    • Author(s)
      岡本鈴佳・浦山健治
    • Organizer
      2019 年日本液晶学会討論会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Responsive Photonic Crystals Based on Cholesteric Liquid Crystal Elastomers/Gels2018

    • Author(s)
      Kenji Urayama
    • Organizer
      EMN meeting on Smart and Multifunctional Materials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Responsive Photonic Cholesteric Elastomers/Gels2018

    • Author(s)
      Kenji Urayama
    • Organizer
      The 5th International Conference on Nanomechanics and Nanocomposites
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Stimulus Responsive Liquid Crystal Elastomers/Gels2018

    • Author(s)
      Kenji Urayama
    • Organizer
      The 12th International Gel Symposium
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Book] Chapter 16 in "Soft Actuators"2019

    • Author(s)
      Kenji Urayama
    • Total Pages
      17
    • Publisher
      Springer
    • ISBN
      9789811368493
    • Related Report
      2019 Annual Research Report
  • [Book] 刺激応答性高分子ハンドブック2018

    • Author(s)
      浦山健治
    • Total Pages
      10
    • Publisher
      NTS出版
    • ISBN
      9784860435356
    • Related Report
      2018 Annual Research Report

URL: 

Published: 2018-04-23   Modified: 2022-01-27  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi