脂肪酸/非イオン界面活性剤2成分混合系の熱的性質 : 第2報 オクタン酸の融解挙動に及ぼすアルキルエーテル型非イオン界面活性剤の混合効果
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概要
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Thermal properties of binary mixture of octanoic acid (C_8) and dodecyl tetra (oxyethylene) ether (C_<12>(EO)_4) varying composition were measured using differential scanning calorimeter (DSC) in order to obtain basic informations on the thermotropic behavior of oily soils and surfactants in detergent systems. Endothermic peaks in DSC curves of mixture varied with composition. The melting temperature of C_8 was appreciably depressed by mixing of C_<12>(EO)_4 and eutectic mixture was formed at molar ratio of 1:2 (C_8/C_<12>(EO)_4). Since eutectic composition and temperature were not fitted to theoretically derived values, it was suggested that C_8 strongly interact with C_<12>(EO)_4. The interaction parameter between C_8 and C_<12>(EO)_4 was estimated from the depression of melting temperature of C_8.
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