基于全氟丁基的氟表面活性剂的油水界面张力

研究以全氟丁基为基础的、在酸性环境中具有高表面活性的叔胺盐酸盐型阳离子氟表面活性剂C_4F_9SO_2NH(CH_2)_3NH(CH_3)_2+Cl~-(简称PFB-MC)的油水界面张力以及不同添加物的影响。通过界面张力测定,考察Na Cl、盐酸、正丁醇、异丁醇、正戊醇、正己醇,以及烷基三甲基氯化铵〔CnH_(2n+1)N(CH_3)_3Cl,n=12,16,18〕对PFB-MC水溶液-正庚烷界面张力的影响。分别测定PFB-MC与烷基磺酸钠CnH_(2n+1)SO_3Na(n=4,6,8)复配体系的表面张力及正庚烷-水界面张力,并与十二烷基苯磺酸钠(SDBS)复配的界面张力结果进行对比。结果表明,较高浓度的NaCl、盐酸、脂肪醇均能使体系的油水界面张力降低,但仅降低1~3 m N/m;烷基磺酸钠与PFB-MC表现出很好的协同性,体系的油水界面张力显著降低(降低4~9 m N/m),且界面张力随烷基磺酸钠碳链的增长而降低;而PFB-MC与SDBS复配由于溶解性的原因体系界面张力很高,其清液的界面张力为18.6m N/m。

Interfacial Tension of Perfluorobutyl-based Fluorinated Surfactant

The production and application of fluorinated surfactants containing long fluorocarbon chains have been restricted due to their environmental persistence and bioaccumulation. Thus seeking replacement products is in urgent needs. In this work, the oil-water interfacial tension of a perfluorobutyl-based cationic fluorinated surfactant, C4F9SO2NH(CH2)3NH(CH3)2+Cl- (PFB-MC), was investigated. PFB-MC was highly surface active in acidic aqueous environment. The effects of different kinds of additives, such as NaCl, hydrochloric acid, n-butanol, iso-butanol, n-pentanol, n-hexanol, and alkyltrimethylammonium chlorides (CnH2n+1N(CH3)3Cl, n = 12, 16, 18), on the interfacial tension of PFB-MC at n-heptane-water interface were studied. The surface tension of the aqueous mixtures of PFB-MC and CnH2n+1SO3Na (n = 4, 6, 8) were measured, as well as their interfacial tension against n-heptane. The interfacial tension of the mixture of PFB-MC and sodium dodecylbenzene sulfonate (SDBS) was also measured for comparison. The results showed that, the addition of relatively high concentration of NaCl, hydrochloric acid, or fatty alcohols could all reduced the oil-water interfacial tension of the system, however, the reduction of interfacial tension was only 1~3 mN/m; In contrast, the addition of CnH2n+1SO3Na brought the best synergism and could remarkably reduce the oil-water interfacial tension of PFB-MC by a reduction of 4~9 mN/m, and the interfacial tension decreased with the chain length of sodium alkane sulfonates; However, the interfacial tension of the mixture of PFB-MC and SDBS was rather high (18.6 mN/m for the clear phase ) because of the poor solubility.