2013 Fiscal Year Final Research Report
Relaxation of entangled polymers under fast flow
| Project/Area Number |
23350113
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Polymer/Textile materials
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Hiroshi 京都大学, 化学研究所, 教授 (90167164)
MATSUMIYA Yumi 京都大学, 化学研究所, 助教 (00378853)
UNEYAMA Takashi 京都大学, 化学研究所, 助教 (10524720)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 高分子 / レオロジー / 誘電緩和 / シミュレーション / ダイナミクス / モデリング |
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| Research Abstract |
In this study we focused on polymer dynamics under fast flow. We performed viscoelastic and dielectric measurements under fast flow. By particle tracking velocimetry, we confirmed that the dielectric relaxation is not accelerated under fast uniform shear field. To explain this result, we constructed a semi-phenomenological dumbbell model with non-isotropic, flow-rate dependent friction constant for polymer. The flow-rate dependence of the friction was extracted from experimental data for stress relaxation after cessation of fast elongational flows. We implemented the flow-rate dependent friction into a molecular model that is able to semi-quantitatively predict viscoelasticity of polymers under fast flows.
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