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Synthesis and properties of gemini-type hydrocarbon-fluorocarbon hybrid surfactants |
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| Authors: | Aimi Ohno Yukishige Kondo Toshio Teranaka |
| Affiliation: | a Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science, 12-1 Ichigaya-Funagawara, Shinjuku, Tokyo 162-0826, Japan b Division of Colloid and Interface Science, Research Institute for Science and Technology, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan c Department of Oral Medicine, Division of Restorative Dentistry, Kanagawa Dental College, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan |
| Abstract: | Gemini-type hybrid surfactants with two fluorocarbon chains connected through a hydrocarbon spacer, F(CF2)m(CH2)2CH(OSO3Na)(CH2)nCH(OSO3Na)(CH2)2(CF2)mF [Fm(Hn)FmOS, m = 4, 6; n = 5, 6, 7, 8)], were synthesized and their surface chemical properties were examined with the aim to have highly functional and highly water-soluble fluorinated surfactants when compared with the conventional fluorinated surfactants. Comparisons of the surface chemical properties of the synthesized gemini-type hybrid surfactants with those of monounit-type hybrid surfactants, F(CF2)m(CH2)2CH(OSO3Na)(CH2)nH [FmEHnOS, m = 4, 6; n = 3, 5)], revealed that gemination causes a remarkable lowering (about 1/100) in cmc value while it produces little changes in Krafft point (below 0 °C) and surface tension at cmc (γcmc). |
| Keywords: | Gemini-type hybrid surfactant Sodium sulfonate Hydrocarbon spacer Remarkable lowering in cmc value Surface tension |
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