全氟羧酸二价盐及全氟羧酸/三价金属盐混合体系表面活性研究

合成一系列全氟辛酸二价盐(M(PFOA)_2,M~(2+)=Mg~(2+),Ca~(2+),Sr~(2+),Ba~(2+))和全氟丁酸二价盐(M(PFBA)_2),并测定其在水、二甲基亚砜(DMSO)和乙二醇(EG)中的表面张力,同时测定了全氟辛酸(PFOA)和全氟丁酸(PFBA)分别与三价金属盐(LaCl_3和FeCl_3)组成的混合物在水溶液中的表面张力。结果表明,与相应的钾盐相比,M(PFOA)_2和M(PFBA)_2具有更高的表面活性,而全氟羧酸(PFOA或PFBA)与三价金属盐的混合物未见表面活性显著提高。M(PFOA)_2可作为降低PFOA盐使用量的重要方法加以应用。

The surface activity study of divalent salts of perfluorinated carboxylic acids (PFA) and the mixtures of PFA/trivalent metal salts

A series of divalent salts (M(PFOA)2 and M(PFBA)2, M2+ = Mg2+, Ca2+, Sr2+, Ba2+) of perfluorooctanoic acid (PFOA) and perfluorobutanoic acid (PFBA) were synthesized, whose surface activities in water, dimethyl sulfoxide (DMSO) and ethylene glycol (EG) were studied. The aqueous solutions of perfluorinated carboxylic acids (i.e. PFOA and PFBA) mixed with trivalent metal salts were also investigated by surface tension measurement. The results showed that the surface activities of M(PFOA)2 and M(PFBA)2 were higher than that of potassium perfluorooctanoate (PFOK) and potassium perfluorobutanoate (PFBK), respectively, in all of the three solvents. But the surface tension of the mixtures of PFOA (or PFBA) and trivalent metal salts showed no improvement compared with that of PFOA (or PFBA) alone. M(PFOA)2 had shown the potential of reducing the usage amount of PFOA salts in application