Critical Micelle Concentrations and Partial Molar Volumes for Perfluoroalkanoates Salts in Aqueous Solutions.

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  • ペルフルオロアルカン酸塩水溶液の臨界ミセル濃度および部分モル体積
  • ペルフルオロアルカンサンエン スイヨウエキ ノ リンカイ ミセル ノウド オヨ

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Determination was made of critical micelle concentrations (cmc) for four homologs of perfluoroalkanoate salts, CnF2n+1COOLi (n=510), CnF2n+1COONa (n=58), CnF2n+1 COOMe4N (n=510), and CnF2n+1COOEt4N (n=410), in aqueous solution at 25°C. The results were expressed as, log cmc=A+Bn. B values were -0.445-0.463, indicating cmc to decrease by 2.82.9 for each CF2 group added to the perfluoroalkyl chain. The effects of counter ions on cmc for C7F15COO-M+ (M=Li, Na, K) were examined at 35°C. It was found that cmc decreased in the order of Li>Na>K. Limiting partial molar volumes (V0) for CnF2n+1COOMe4N (n=16) in water were measured at 25°C.V0 values increased with the number of carbon atoms ; the increment per CF2 group was 23.7 cm3·mol-1 on the average.

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