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Elucidating the Unusual Charge Screening Effect on the Polymer Dynamics of Polymerized Ionic Liquids

Research Project

Project/Area Number 19K15641
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 35020:Polymer materials-related
Research InstitutionUniversity of Fukui (2020)
Okinawa Institute of Science and Technology Graduate University (2019)

Principal Investigator

Matsumoto Atsushi  福井大学, 学術研究院工学系部門, 助教 (20812978)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords高分子化イオン液体 / イオン液体 / 高分子電解質 / 静電遮蔽 / 粘弾性スケーリング / レオロジー / 静電遮蔽効果 / スケーリング則 / レオロジ― / 高分子溶液物性 / 高分子粘弾性
Outline of Research at the Start

高分子化イオン液体(PIL)は,繰り返し単位にイオン液体構造を有し,電池材料などへの応用が期待されている.PILといった高分子材料の成型加工性を向上させるためには,高分子の分子運動を正確に理解する必要がある.高分子の分子運動は,高分子の粘弾性と分子モデルの比較により解釈される.本研究は,PILの準希薄溶液において,遮蔽長がイオン濃度増加とともに増加するという特異な静電遮蔽効果が高分子間相互作用とどのように競合し,その結果,PILの分子鎖全体の大規模運動にどのような影響を与えるのかを明らかにすることを目的とする.そして,PIL鎖の溶液中における大規模運動を予測する新規分子モデルの確立を目指す.

Outline of Final Research Achievements

We conducted detailed rheological characterization of three imidazolium-based polymerized ionic liquid (PC4-X) in a mixture of salt-free solvent (DMF) and an ionic liquid (Bmim-X) consisting of the same side-chain cation, but possessing different counter-anions (X) in size: bis(pentafluoroethanesulfonyl)imide (X=PFSI; large), bis(trifluoromethanesulfonyl)imide (X=TFSI; intermediate), and tetrafluoroborate (X=BF4; small) in the semidilute unentangled regime. Based on the observed dependence of the zero-shear viscosity and longest relaxation time on the PIL concentration, ionic liquid concentration, and the size of counter-anions, we established a new charge screening model that accounts for both the modified charge screening and complete charge screening effects on the conformation of PIL chains and their viscoelastic properties at high ionic liquid concentrations.

Academic Significance and Societal Importance of the Research Achievements

本研究により,高分子間相互作用がはたらく高分子濃度領域においても,遮蔽長がイオン濃度とともに長くなるという特異な静電遮蔽効果が観測されることがわかった.この結果は,PIL鎖の固体中における分子運動の理解へと繋がり,また得られた静電遮蔽モデルは優れたPIL材料設計に繋がると期待される.

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (8 results)

All 2021 2020 2019

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] Rheological Scaling of Ionic Liquid-Based Polyelectrolytes in the Semidilute Unentangled Regime from Low to High Salt Concentrations2021

    • Author(s)
      Atsushi Matsumoto, Ryota Yoshizawa, Osamu Urakawa, Tadashi Inoue, Amy Q. Shen
    • Journal Title

      Macromolecules

      Volume: -

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Rheology of the Electric Double Layer in Electrolyte Solutions2020

    • Author(s)
      Funari Riccardo、Matsumoto Atsushi、de Bruyn John R.、Shen Amy Q
    • Journal Title

      Analytical Chemistry

      Volume: N/A Issue: 12 Pages: 8244-8253

    • DOI

      10.1021/acs.analchem.0c00475

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Rheological Scaling of Ionic Liquid-Based Polyelectrolytes in Ionic Liquid Solutions2021

    • Author(s)
      Atsushi Matsumoto, Ryota Yoshizawa, Osamu Urakawa, Tadashi Inoue, Amy Q. Shen
    • Organizer
      Annual European Rheology Conference 2021
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Ion Transport in Pendant and Backbone Polymerized Ionic Liquids2020

    • Author(s)
      Preeya Kuray, Takeru Noda, Atsushi Matsumoto, Ciprian Iacob
    • Organizer
      The APS March Meeting 2020
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Viscoelastic Measurement of Electric Double Layer Using Quartz Crystal Microbalance2020

    • Author(s)
      Funari Riccardo, Atsushi Matsumoto, John de Bruyn, Amy Q. Shen
    • Organizer
      The 100th CSJ Annual Meeting
    • Related Report
      2019 Research-status Report
  • [Presentation] Rheological Scaling of Ionic Liquid-Based Polyelectrolytes in Ionic Liquid Solutions2019

    • Author(s)
      Atsushi Matsumoto, Francesco Del Giudice, Rachapun Ratrattanadumrong, Amy Q. Shen
    • Organizer
      第67回レオロジー討論会
    • Related Report
      2019 Research-status Report
  • [Presentation] Rheological Scaling of Ionic Liquid-Based Polyelectrolytes in Ionic Liquid Solutions2019

    • Author(s)
      Atsushi Matsumoto, Francesco Del Giudice, Rachapun Ratrattanadumrong, Amy Q. Shen
    • Organizer
      Okinawa Colloids 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Rheological Scaling of Imidazolium-Based Polyelectrolyte in Ionic Liquid Semidilute Solutions2019

    • Author(s)
      Atsushi Matsumoto, Amy Q. Shen
    • Organizer
      The Society of Rheology 91st Annual Meeting
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2022-01-27  

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