2021 Fiscal Year Final Research Report
Viscoelastic properties of semiflexible polymers and application to reinforcement effects
Project/Area Number |
19H02777
|
Research Category |
Grant-in-Aid for Scientific Research (B)
|
Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 35020:Polymer materials-related
|
Research Institution | Osaka University |
Principal Investigator |
Inoue Tadashi 大阪大学, 理学研究科, 教授 (80201937)
|
Co-Investigator(Kenkyū-buntansha) |
浦川 理 大阪大学, 理学研究科, 准教授 (70273539)
|
Project Period (FY) |
2019-04-01 – 2022-03-31
|
Keywords | 粘弾性 / 半屈曲性高分子 / 緻密からみ合い / 動的複屈折 / からみ合いの普遍性 / 配向緩和 |
Outline of Final Research Achievements |
The viscoelasticity of flexible polymers can be described by entropic elasticity due to segment orientation. In contrast, in the case of semi-flexible polymers, in addition to orientation, bending and elongation modes are expected to contribute to viscoelasticity. In this study, using poly(γ-benzyl L-glutamic acid) as a model polymer, we show that the Morse theory can describe viscoelasticity in the dilute region well. Furthermore, viscoelasticity at high concentrations can be reasonably predicted by considering hydrodynamic and topological interactions. In particular, viscoelasticity in the tightly entangled region, which is unique to semi-flexible polymers, was clarified for the first time with the strain-induced birefringence. In addition, we clarified a universal function for the relationship between entanglement density and molecular structure experimentally.
|
Free Research Field |
高分子物理化学
|
Academic Significance and Societal Importance of the Research Achievements |
持続可能な社会の実現のために,セルロースナノファイバーなどの天然由来の新材料を有効に使うことが望まれている.本研究では,ナノファイバーが半屈曲性高分子として振る舞うことを着目し,その粘弾性と補強効果に関する基礎的かつ普遍的な知見を,希薄域から濃厚域まで初めて系統的に明らかにした.ナノファイバーならではの,細さに由来する熱運動により励起される曲げと伸長モードの寄与をあきらにしている.本研究の成果を基に,天然由来のナノファイバーを用いた材料の物性に関して,その制御と向上が達成できると期待される.
|