Solution properties and aggregating structures for a fluorine-containing polymeric surfactant with a poly(ethylene oxide) macro-monomer

A polymeric surfactant (PFSA) was synthesized by the aqueous free-radical copolymerization using acrylamide, sodium 2-acrylamido-2-methylpropane sulphonate, allyl-capped octylphenoxy poly(ethylene oxide) with the polymerization degree of 20 (AOP), and 1H, 1H, 2H, 2H-perfluoro-1-decyl p-vinylbenzyl ether (VF). PFSA exhibited both of the good surface and interfacial activities and the thickening behavior. It could be used in enhanced oil recovery to increase both sweep and oil-displacement efficiencies. The critical micelle concentration (CMC) of PFSA was 0.1 g/L in aqueous solution. The spherical micelles with the diameter of 100 nm were formed at CMC, and numerous compact worm-shaped micelles were observed above CMC. The interfacial tension was 0.027 mN/m for the 0.1 g/L PFSA solution containing 5 g/L NaCl and 0.209 g/L SDBS. The PFSA solutions still showed low interfacial tensions at high NaCl concentrations and temperatures, respectively, because of the incorporation of both VF and AO...

本研究通过水溶液自由基共聚法，以丙烯酰胺、2-丙烯酰胺-2-甲基丙磺酸钠、聚合度为20的烯丙基封端辛基苯氧基聚环氧乙烷（AOP）以及1H,1H,2H,2H-全氟-1-癸基对乙烯基苄基醚（VF）为单体，合成了聚合物表面活性剂（PFSA）。该PFSA兼具优异的表面活性与界面活性，同时具备增稠性能，可应用于强化采油领域，以提升波及效率与驱油效率。PFSA在水溶液中的临界胶束浓度（critical micelle concentration，CMC）为0.1 g/L；在CMC条件下可形成粒径为100 nm的球形胶束，当溶液浓度高于CMC时，则会生成大量致密的蠕虫状胶束。当浓度为0.1 g/L的PFSA溶液中含有5 g/L氯化钠（NaCl）与0.209 g/L十二烷基苯磺酸钠（SDBS）时，其界面张力为0.027 mN/m。得益于VF与AOP两种单体的引入，PFSA溶液在高NaCl浓度及高温条件下仍可维持较低的界面张力。