無水マレイン酸-セチルビニルエーテル交互共重合体カリウム塩とモノソープとの水中における複合体形成とポリソープの会合状態の変化

概要

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To investigate the solution behavior of the polysoap (potassium salt of alternating maleic anhydride and cetylvinyl ether copolymer), the interaction between polysoap and monosoap (potassium laurate (KL) and caprylate) in aqueous solutions was studied by determination of the amount of KL bound onto the polysoap, and by the light scattering measurement of aqueous polysoap solutions containing constant concentrations of monosoaps or potassium acetate. The binding of KL onto the polysoap occurred over the entire concentration range, similarly to the solubilization of oil by polysoap. The amount of KL onto the polysoap increased linearly with polysoap concentration, and was 0.7 mol/basemol polysoap at the 0.4% polysoap solution in the 0.18 M-KOH solution as a solvent. Potassium salts of shorter members of fatty acids (≤C8) promoted the intermolecular association between polysoap molecules, instead of the binding onto the polysoap. On the other hand, KL interrupted the intermolecular association between polysoap molecules in aqueous solution, because of hydrophobic interaction between the hydrophobic portion of KL and polysoap, and so the complex formation of KL and almost one unit of polysoap may be confirmed.
社団法人日本油化学会の論文