| Project/Area Number |
07555298
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
高分子構造・物性(含繊維)
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| Research Institution | Nagoya University |
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Principal Investigator |
DOI Masao Nagoya University, School of Engineering, Professor, 工学部, 教授 (70087104)
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| Co-Investigator(Kenkyū-buntansha) |
SAKAI Mikihiro Eiko Seiki Co., Ltd., Researcher, 研究員
INOUE Akio Asahi Chemical Industry Co., Ltd., Researcher, 研究員
NAGAYA Tomoyuki Okayama University, Faculty of Education, Assistant Professor, 教育学部, 講師 (00228058)
ORIHARA Hiroshi Nagoya University, School of Engineering, Associate Professor, 工学部, 助教授 (30177307)
ISHIBASHI Yoshihiro Nagoya University, School of Engineering, Professor, 工学部, 教授 (00023052)
坂井 樹弘 英弘精機(株), 研究員
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥16,100,000 (Direct Cost: ¥16,100,000)
Fiscal Year 1996: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1995: ¥11,100,000 (Direct Cost: ¥11,100,000)
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| Keywords | Electrorheology / Liquid crystalline Polymer / Immiscible Polymer blended / Rheology |
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| Research Abstract |
Since the observation of a large electrorheological (ER) effect in polymer blends of sidechain type polysiloxane liquid crystalline polymers (LCPs) and a dimethylsilicone (DMS) by Inoue et al, we have been making an intensive investigation to elucidate the mechanism. So far, we have clarified the fundamental mechanism of the polymer blend consisting of LCP droplets with high viscosity dispersed in DMS with low viscosity, which stretch and coalesce to from bridges between electrodes under an electric field, resulting in the increase of the apparent viscosity.
This year we have investigated the transient process after applying a step electric field under shear flow by measuring the shear stress and the transmitted intensity through the sample at the same time. As a result, it was found that the transient process consists of two modes ; just after applying the field the stress steeply increases (the first mode) and then slowly increases (the second mode). From this result and observations with a high speed video camera, we concluded that the first mode corresponds to the stretch of droplets and the formation of bridges between electrodes, and the second mode to the growth of the bridge. In addition, we have performed computer simulations to investigate the deformation of the droplets under an electric field and/or a shear flow.
Through the present project the the mechanism of ER effect in polymer blends have been clarified. On the basis of the obtained results ER fluids applicable to actual devices will be developed in the near future.
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