| Project/Area Number |
15550102
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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 |
Polymer chemistry
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
MORI Toshiaki TOKYO INSTITUTE OF TECHNOLOGY, DEPARTMENT OF BIOMOLECULAR ENGINEERING, ASSOCIATE PROFESSOR, 大学院・生命理工学研究科, 助教授 (50262308)
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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 |
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 2004: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2003: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Supercritical Fluids / Carbon Dioxide / Fluoroform / Precision Polymerization / Surface Modification / Tetratluoroethylenes / Hydrophobicity Lipophobicity / ESCA |
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| Research Abstract |
Homogeneous polymerizations of tetrafluoroethylenes were executed in supercritical fluoroform, and the morphology of the resulting poly (tetrafluoroethylene)s were observed as the fibrous which were dispersedly and uniformly twined with low density, independent of pressure in the systems. Each piece was ca 100 nm in width and 10 μm in long. The number average of molecular weight and conversions of poly (tetrafluoroethylene) can be controlled by pressure and temperature from 10^4 to 10^6, and 60%-80%, respectively. Heterogeneous detergent, stabilizer-free polymerization can be performed in supercritical supercritical fluoroform/water emulsion. Uniform spherical submicron-particles (200 nm) were obtained, dependent of pressure and water content in the systems.
Processing of polymer substrates such as swelling and immersing by supercritical fluids have been studied as a new route to a polymer surface modification. Polymerization of tetrafluoroethylenes (TFE) was carried out in scCO_2 or scCHF_3 in the presence of high density polyethylene (HDPE) and polycarbonate (PC) plates. The surface property was determined by X-ray photoelectron spectroscopy, and its surface energy was estimated by contact angles. Thickness and density of the penetrating PTFE onto substrates depend on conditions of supercritical fluids such as pressure or temperature.
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