Abstract
Resin was divided into five subfractions by precipitation method of mixed solvents. The effects of molecular size, concentration and polarity of resin and its subfractions on dynamic interfacial tensions (DIFTs) of alkylbenzene sulfonate (ABS) solutions were investigated. The results showed that the resin subfractions with larger molecular size had a slight effect on DIFTs and DIFTs curves showed the “L” shape, no matter what polarity or concentration. For resin and its subfractions with smaller molecular size, they had a significant effect on DIFTs at higher concentrations, DIFTs curves showed the “V” shape. However, the variations of minimum interfacial tension (IFTmin) were not entirely consistent with the molecular size of resin and its subfractions. The IFTmin is not only affected by molecular size but also by polarity. Resin and its subfractions with smaller molecular size and higher polarity resulted in lower IFTmin. The influence mechanisms of resin and its subfractions on DIFTs were also discussed in detail.
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