2023 Fiscal Year Final Research Report
Detailed Viscoelastic Analysis for Semidilute Entangled Solutions of Polyelectrolytes Using Diffusing Wave Spectroscopy
| Project/Area Number |
21K14686
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 35020:Polymer materials-related
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| Research Institution | University of Fukui |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 高分子電解質 / 絡み合い粘弾性 / 溶液物性 / マイクロレオロジー / 拡散波分光法 |
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| Outline of Final Research Achievements |
Using monodisperse poly(sodium styrene sulfonate) as a model polyelectrolyte system, the high-frequency linear viscoelastic analysis of entangled polyelectrolyte solutions was conducted through diffusing wave spectroscopy micro-rheology method. We found that the entanglement properties of the tested polyelectrolyte at low molecular weights followed the scaling laws for electrically neutral polymers, while those at high molecular weights exhibited the scaling relation predicted for polyelectrolyte solutions. We experimentally demonstrate that the effect of the electrostatic interaction on the entanglement dynamics of polyelectrolytes varies depending on the molecular weight of polyelectrolytes.
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| Free Research Field |
polymer physics
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| Academic Significance and Societal Importance of the Research Achievements |
高分子電解質は食品のレオロジー改質剤やセメント中粒子の分散性を安定化させる目的として使用されるなど，我々の生活に必要不可欠な高分子である．一般的に，高分子電解質を溶液に溶かせば，静電相互作用がはたらき，その影響を受けた溶液物性が予想される．しかしならが，我々の研究結果は，高分子電解質の分子量によっては，静電相互作用は作用しないことを実験的に示しており，溶液物性制御における重要な材料開発指針を与えるものである．
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