| Project/Area Number |
15560595
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Composite materials/Physical properties
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
MORIKAWA Junko TOKYO INSTITUTE OF TECHNOLOGY, Graduate School of Engineering, Research Associate, 大学院・理工学研究科, 助手 (20262298)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2004: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2003: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | Thermal Diffusivity / Thermal Conductivity / Composite Materials / Micro thermal interface / Temperature Wave Analysis / Infrared thermal image |
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| Research Abstract |
A methodology for the measurement of thermal diffusivity and thermal conductivity at the micro-scale interface of multi-layered materials were proposed by use of a temperature wave analysis and a high-speed micro-scale focal plane arrays. The advantage of this technique stands on the two-dimensional visual information with the more than ten thousands pixels of focal plane arrays of IR sensitive photo sensor. This method is applicable not only to determine the value of thermal conductivity or diffusivity but also to observe the two-dimensional anisotropy of thermal property of the materials.
In this study the technique was applied to the observation of thermal resistance at the interface of the multi-layer polymer films by using a temperature wave. This is a quite new application of infrared photographs to the quantification of thermal interface with a combination of a high speed IR-FPA with a microscopic lens. It visualized a phase image by inputting a temperature wave. The two-dimensio
… More
nal phase lock-in technique was applied to the evaluation of phase delay at the thermal interface with a spatial resolution of 7.5μm. At the positions of the first and the second interfaces between the polyimide films, for example, a large dropping down of the phase was observed, that was originated from the thermal resistance to the propagation of temperature wave in the thickness direction and a grease compound made it decreased. The relationship between the thermal conductivity of the grease compound and the phase shift at the interface was examined by the phase shift at the interface.
As an example, thermal diffusivity of electric polarized bi-axially stretched poly(ethylene terephthalate)(PET) films was measured by temperature wave analysis and its relationship with the structure and conformation was assessed by Fourier transform infrared(FTIR). Electric field in the thickness direction of the specimen up to 950 kV/cm was applied during heating and cooling treatment from 28 to 100℃. An orientation function was calculated from dichroic ratio of 1719 cm^<-1> band which is assigned to a permanent dipole of>C=O, shows an increasing orientation with the increase of polarization field. Thermal diffusivity of stretched PET film increases up to the duplicate value with the 950KV/cm impression. The possibility of controlling the thermal diffusivity by the electric polarization of side chains in the ordered state was clearly shown. Less
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