Abstract
The apparent molar volumes (VΦ,C) of poly(ethylene oxide)13-poly(propylene oxide)30-poly(ethylene oxide)13 (Pluronic L64) in aqueous electrolyte solutions were determined as functions of L64 concentrations at some temperatures. The electrolytes studied are sodium perchlorate, sodium decyl sulfate (NaDeS), sodium decanoate (NaDec), and decyltrimethylammonium bromide (DeTAB). Sodium perchlorate plays the same role as temperature on VΦ,C data because of its destructuring solvent effect. At a given temperature, sodium decyl sulfate, in both the dispersed and micellized states, strongly affects not only the VΦ,C vs mC profile but also their values. In fact, VΦ,C decreases with mC to the critical micelle concentration (cmc), beyond which it increases, tending to level off. The experimental data are consistent with the idea that the addition of dispersed L64 to the micellar NaDeS solutions leads to the formation of NaDeS micelles with aggregation numbers lower than those in pure water; this likely results from t...
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