Surface Activities of Nonionic Polymeric Surfactants
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概要
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The relationship between surface activity and molecular structure has been studied for the nonionic polymeric surfactants which have 2,3,4 or 6 branches of polypropylene glycol-polyethylene glycol (PPG-PEG) chain in their molecules. A linear relation, 1⁄<I>Δ</I>γ=<I>A</I>+<I>B</I>·<I>x</I>⁄<I>y</I> has been found to hold for each series, where <I>Δ</I>γ is the surface tension depression of surfactant solution of a given concentration from that of water, <I>x</I>⁄<I>y</I> is the molecular structure index, in which <I>x</I> is the weight percent of PEG group in a molecule and <I>y</I> is the molar weight of PPG part, and <I>A</I> and <I>B</I> are constatns. Constant <I>A</I>, being equal to 0.025 cm/dyn, is independent of the concentration and the number of PPG-PEG branches and corresponds to the reciprocal of surface tension lowering of an aqueous solution of infinitely large PPG polymer. Constant <I>B</I> decreases linearly with the logarithm of molar concentration, and increases with the number of branches. It also depends on the hydrophilic nature of the central group of molecule.
- 公益社団法人 日本化学会の論文
著者
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NAKAMURA Masao
Department of Applied Physics, The University of Tokyo
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Sasaki Tsunetaka
Department of Chemistry Faculty of Science Tokyo Metropolitan University
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