| Project/Area Number |
61470107
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子合成
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| Research Institution | Osaka University |
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Principal Investigator |
KAMACHI Mikiharu Department of Macromolecular Science,Faculty of of Science,Osaka University, 理学部高分子学科, 助教授 (40028163)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 1987: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1986: ¥5,500,000 (Direct Cost: ¥5,500,000)
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| Keywords | Radical polymerization / propagating radical / ESR / vinyl ethers / isopropenyl acetate / ラジカル構造 / 酸化還元電位 / 成長ラジカル / 酸化環元電位 / 重合反応 / 重合規制 |
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| Research Abstract |
The radical polmerization is one of the most established fields in polymer chemistry,and a lot of studies have been carried out on the radical polymerization of vinyl compounds.However,problems still remain unsolved on the physicochemical propeties of the propagating radicals.The ESR spectroscopy has been considered to be one of the potential method for the clarification of these problems.we succeeded on the detection of the ESR spectra of the transient species in the radical polymerization of vinyl compounds by using the new type of cavity:the ESR spectra of the propagating radicals of isopropenyl acetate and vinyl ethers,which did not polymerize to high polymer,were observed directly at room temperature.Accordingly, reason why high polymers could not be obtained from these monomers by radical initiators was discussed on the basis of the structure of the propagating radicals. In addition,new information on the physicochemical property of the propagating radicals was found in the ESR studies.However,we could not succeeded in the estimation of the redox potentials of the propagating radicals,because the sensitivity of the ESR spectrometer decreased with mounting the instrument for the measurements of the redox potentials.
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