| Project/Area Number |
20550143
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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 |
Environmental chemistry
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| Research Institution | Osaka Municipal Technical Research Institute |
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Principal Investigator |
ONO Daisuke Osaka Municipal Technical Research Institute, 研究員 (30416317)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Masaki 地方独立行政法人大阪市立工業研究所, 研究員 (20416316)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2008: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 両親媒性化合物 / 界面活性剤 / 化学分解性 / アセタール / ジオキソラン / 非イオン性 / 二疎水鎖型 |
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| Research Abstract |
Three types of surfactants bearing acetal or 1,3-dioxolane ring were prepared by acid-catalyzed condensation of fatty ketones with diol compounds, followed by a reaction with polyethyleneglycol or diethanolamine without any expensive reagents or special equipment. These surfactants had smaller critical micelle concentration (cmc) compared to polyoxyethylene (n=9) dodecyl ether (C12EO9). They were decomposed easily under acidic conditions. After 28 days they were more than 60% biodegradable and were almost the same as sodium dodecanoate. Polystyrene could be synthesized by emulsion polymerization using these chemocleavable surfactants. After emulsion polymerization, the emulsions could be easily broken by adding either HCl. Further, polystyrene could be filtered off very quickly. In the case of type 3, the polydispersities and polymerization degree of the obtained polystyrene were better than those of the polystyrene in the conventional emulsifiers. Further, the Na content values of the former were lower than those of the latter.
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