非イオン界面活性剤の性質におよぼす構造効果 (第5報) : アルカンジオール-エチレンオキシド付加体の合成と界面化学的性質

概要

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Di (2-hydroxyethyl) ether of 4, 9-dodecanediol was prepared and polyoxyethylated using basic catalyst to give the following nonionics (AD-12-4, 9 series). HO (C2H4O) m/2CH (n-C3H7) (CH2) 4CH (n-C3H7) O (C2H4O) m/2H Polyoxyethylated 1, 12-dodecanediol (AD-12-1, 12 series) and 1, 14-tetradecanediol (AD-14-1, 14 series) were also prepared. Some physicochemical properties of these new type nonionics were compared with those of 1-dodecanol-EO adducts (S-12 series) and other nonionics, in order to clarify the effects of relative position of two POE chains attached to n-alkane. Cloud points of aqueous solutions of these AD series were lower than those expected from their Daviess HLB values. Critical micelle concentrations and aqueous surface tensions of these AD series were considerably higher than those of comparable S series. Molecular areas of both AD-12 series were about two times larger than that of S-12 series. These results were discussed in terms of the characteristic configuration of these nonionics and the hydration mode of their POE chains in surface film or micellar surface. The gross effects such as foaming, wetting and anti-foaming powers of these AD series were also measured and compared with those of other types of nonionics.