| Project/Area Number |
12450373
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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 |
高分子合成
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| Research Institution | Kobe University |
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Principal Investigator |
OKUBO Masayoshi Kobe University, Dept. of Chem. Sci. and Eng. Fac. of Eng., Professor, 工学部, 教授 (30031131)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Toyoko Kobe University, Dept of Chem. Sci. and Eng. Fac. of Eng., Research Associate, 工学部, 教務職員(教育職) (40314504)
MINAMI Hideto Kobe University, Dept. of Chem. Sci. and Eng. Fac. of Eng., Research Associate, 工学部, 助手 (20283872)
MATSUO Shigenobu Kobe University, Dept. of Chem. Sci. and Eng. Fac. of Eng., Lecturer, 工学部, 講師 (20135817)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥10,900,000 (Direct Cost: ¥10,900,000)
Fiscal Year 2001: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 2000: ¥6,400,000 (Direct Cost: ¥6,400,000)
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| Keywords | Polymer particle / Supercritical carbon dioxide / Precipitation polymerization / Macroinitiator / Colloidal stabilizer / Cross-linking monomer / Environment / ナノ〜ミクロンサイズ |
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| Research Abstract |
Recently, in addition to water, there have been increasing interests in supercritical carbon dioxide (scCO_2) as environmentally favorable media. The use of scCO_2 as medium for polymerizations has several potential advantages : low cost, low toxicily, eases of medium removal and recycling, and marked variations of solubility power, viscosity and polarity by relatively small changes in temperature and pressure without altering medium composition. The papers describing the dispersion polymerization of vinyl monomers such as methyl methacrylate (MMA) and styrene in scCO_2 have been published in the past eight years. Some fluorinated polymers and poly(dimethylsiloxane) (PDMS)-based polymers have been identified as being soluble in CO_2 or CO_2-philic and have been used as colloidal stabilizers, and there has been increasing interest on the colloidal stabilizers which are effective in scCO_2. In general, PDMS-based polymers may have advantages over fluorinated polymers from the viewpoints that PDMS-based polymers are much less expensive and their solubility in conventional organic solvents makes the characterization of the products obtained easy. In this research, PMMA particles could be produced by dispersion polymerization of MMA in scCO_2 using PDMS-based azoinitiator as inistab (initiator + stabilizer). Production of PMMA particles by the dispersion polymerization of MMA in scCO_2 in the presence of amino propyl terminated PDMS as colloidal stabilizer was also succeeded.
Moreover, polydivinylbiphenyl particles were produced by precipitation polymerization of divinylbiphenyl without any stabilizer in scCO_2 at ca. 30 MPa for 24 h at 65℃. The effects of initiation rate of polymerization on the conversion, the fluidity of powder, the degree of coagulation/ the amount of low molecular weight by-products, and the amount of vinyl groups in the particles were examined.
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