To facilitate the understanding of the intrinsic mechanism responsible for the IFTs of betaine solutions, partly hydrolyzed polyacrylamide (HPAM) and hydrophobically modified polyacrylamide (HMPAM) were employed to investigate their effect on IFTs of different betaine solutions against decane using a spinning drop interfacial tensiometer. Moreover, the effects of oleic acid on the IFTs of betaine-polymer systems were also studied. The results show that the water-soluble polymers (HPAM) form the mixed adsorption film with alkyl sulfobetaine (ASB) molecules and prevent the hydrophilic groups of ASB from lying flat, which produces a minimum IFT with aging time. Besides, the hydrophobic HMPAM forms mixed micelle-like interfacial associations with ASB molecules, which results in a stronger disruption tendency for the interfacial film. The branched xylyl substituted alkyl sulfobetaine (BSB) molecules will form a tight interfacial film, therefore HPAM can’t insert into the interfacial film easily. Meanwhile, steric hindrance makes it difficult to form interfacial aggregates with HMPAM. Thus, the addition of HPAM and HMPAM polymers has little influence on the IFTs in the BSB system. The mixed adsorption of oleic acid and betaine molecules results in a significant decrease in IFTs, especially for BSB. However, in the ASB-polymer system, HPAM forms mixed adsorption film with ASB molecules and hinders the adsorption of oleic acid, accordingly IFTs change little. In contrast, the hydrophobic interaction of HMPAM promotes the adsorption of oleic acid, so the synergistic effect reduces IFTs to some extent. In the BSB-polymer system, the strong synergistic effect between oleic acid and BSB molecules is disrupted by polymers, which results in a significant increase in IFTs. The relevant results are helpful for the design of novel and efficient chemical flooding systems.

中文翻译：

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磺基甜菜碱和聚合物溶液的动态界面张力：结构的影响


为了促进对甜菜碱溶液界面张力的内在机制的理解，部分水解聚丙烯酰胺（HPAM）和疏水改性聚丙烯酰胺（HMPAM）被用来使用旋转滴界面张力计研究它们对不同甜菜碱溶液对癸烷界面张力的影响。此外，还研究了油酸对甜菜碱-聚合物体系界面张力的影响。结果表明，水溶性聚合物（HPAM）与烷基磺基甜菜碱（ASB）分子形成混合吸附膜，防止ASB的亲水基团平放，从而随着老化时间的推移产生最小的IFT。此外，疏水性HMPAM与ASB分子形成混合胶束状界面缔合，这导致界面膜具有更强的破坏倾向。支链二甲苯取代的烷基磺基甜菜碱（BSB）分子会形成紧密的界面膜，因此HPAM不易插入界面膜中。同时，空间位阻使其难以与HMPAM形成界面聚集体。因此，HPAM和HMPAM聚合物的添加对BSB体系中的IFT影响很小。油酸和甜菜碱分子的混合吸附导致IFT显着降低，尤其是BSB。然而，在ASB-聚合物体系中，HPAM与ASB分子形成混合吸附膜，阻碍了油酸的吸附，因此IFT变化不大。相反，HMPAM的疏水相互作用促进了油酸的吸附，因此协同效应在一定程度上降低了IFT。在BSB-聚合物体系中，油酸和BSB分子之间的强协同效应被聚合物破坏，从而导致IFT显着增加。 相关结果有助于新型高效化学驱系统的设计。