非イオン界面活性剤のミセル構造に及ぼす陽イオンの影響

抄録

Effects of cations on the micellar structure of dodecyl poly (oxyethylene) ether (C₁₂EO_n, n : the average number of ethylene oxide groups) were investigated. The results are summarized as follows.
1) C₁₂EO₇ and C₁₂EO₈ micelles were spherical, the micellar volume remaining approximately the same regardless of kind of alkali cation, but the C₁₂EO₆ micelle was not spherical and had a different shape.
2) The contribution of cations to decreasing the polarity within C₁₂EO_n micelles was effective in the order of K⁺>Na⁺>Li⁺.
3) The contribution of cations an increase in micellar weight and the aggregation number of C₁₂EO_n was effective in order of K⁺>Na⁺>Li⁺.
Based on the above, it was concluded that micelles having large aggregation numbers prevented water penetration from the outside, thus decreasing polarity within the micelles.