2020 Fiscal Year Final Research Report
Elucidating the Unusual Charge Screening Effect on the Polymer Dynamics of Polymerized Ionic Liquids
| Project/Area Number |
19K15641
|
|---|
| Research Category |
Grant-in-Aid for Early-Career Scientists
|
| Allocation Type | Multi-year Fund |
|---|
| Review Section |
Basic Section 35020:Polymer materials-related
|
|---|
| Research Institution | University of Fukui (2020)
Okinawa Institute of Science and Technology Graduate University (2019) |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2019-04-01 – 2021-03-31
|
| 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 |
|---|
| 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.
|
| Free Research Field |
高分子物理化学
|
| 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．
|
