Lanthanide Triflates-Mediated Emulsion Cationic Polymerization of <i>p</i>-Alkoxystyrenes in Aqueous Media
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- Kotaro Satoh
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
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- Masami Kamigaito
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
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- Mitsuo Sawamoto
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
書誌事項
- 公開日
- 2000-06-01
- DOI
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- 10.1021/ma0000069
- 公開者
- American Chemical Society (ACS)
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説明
Emulsion cationic polymerization in water was achieved with rare earth metal triflates [Ln(OTf)3; Ln = Yb, Sc, Dy, Sm, Gd, and Nd; OTf = OSO2CF3] that are well-known as water-tolerant Lewis acids. Even in the presence of a large amount of surfactants such as dodecylammonium halides, sodium laurylbenzenesulfate, and poly(vinyl methyl ether), Ln(OTf)3 induced cationic polymerizations of p-methoxystyrene (pMOS) in aqueous media in conjunction with the pMOS−HCl adduct (1) at 30 °C. In particular, the use of cationic surfactants such as dodecyltrimethylammonium chloride accelerated the polymerization and gave polymers of controlled molecular weights and narrower molecular weight distributions (MWDs) (Mw/Mn ∼ 1.4) than those in the absence of surfactants. The activity of Ln(OTf)3 reduced with decreasing the Lewis acidity or the ionic radii of the central metal. The 1/Yb(OTf)3 system also induced the polymerization of p-tert-butoxystyrene (tBOS) in aqueous media. The homopolymerization of tBOS in water was found...
収録刊行物
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- Macromolecules
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Macromolecules 33 (13), 4660-4666, 2000-06-01
American Chemical Society (ACS)
