含フッ素アルコール-エチレンオキシド付加体の合成と性質

概要

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Polyoxyethylene fluoroethers, CF3 (CF2) mCH2O (C2H4O) pH and H (CF2CF2) n CH2O (C2H4O) pH (m=2, 6; n=2, 3, 4; p=3, 5, 10) were prepared by the addition of ethylene oxide (EO) to fluoroalcohols in the presence of a base catalyst and their physicochemical properties-cloud point, surface tension, foaming property, and emulsifying power-weremeasured. The effects of the number of EO moles added and the carbon chain length of starting alcohols onthe surface activities were clarified, and the following results were obtained. 1) Cloud points of aqueous solution of those adducts were found to be higher with an increase in the ni mber of oxyethylene units. 2) Aqueous surface tensions of those adducts decreased with increasing of the carbon chain length of starting alcohols. However, 5 moles EO adducts generally gave the lowest aqueous surface tension in each of the series other than H (CF2CF2) 2CH2O (C2H4O) pH. (p=3, 5, 10). 3) With the exception of ethylene glycol solutions of CF3 (CF2) 6CH2O (C2H4O) pH (p=0, 1, 3, 5, 10), the surface tensions of ethylene glycol solutions of those adducts decreased with increasing of the carbon chain length of starting alcohols and the number of oxyethylene units. 4) CF3 (CF2) 6CH2O (C2H4O) pH (p=5, 10) and H (CF2CF2) 4CH2O (C2H4O) 10H showed a good foaming property. 5) The adducts had strong emulsifying powers toward xylene but weak emulsifying powers toward liquid paraffin.