硅氟两亲聚合物在柴油/水体系中的分水效能及机理

对4种含氟链段聚合度不同的硅氟聚合物在柴油/水体系中的分水效能进行了评价,并通过界面张力和界面黏弹性研究了其分水机理。结果表明,随着含氟链段聚合度的增加,其油水分离时间先减小后增大。含氟单体平均聚合度为16的聚合物质量浓度为0.2g/L时,在23s内实现柴油/水的完全分离。界面张力不是影响分水效能的主要因素,该类聚合物主要通过降低界面膜黏弹性实现有效分水。

Water separation performance and mechanism of fluoro-silicone amphiphilic polymers in diesel oil-water emulsion system

Water separation efficacy of diesel oil-water emulsion system of four kinds of fluoro-silicone polymer with different degree of polymerization of the fluorinated chain was evaluated, and the mechanism for such phenomena was studied via interfacial tension and interfacial viscoelasticity measurements. Results show that, following the increase of degree of polymerization of the fluorinated chain, time needed for diesel oil-water separation decreases firstly and then increases. In case the degree of polymerization of the fluorinated chain achieves 16 and the mass concentration of fluoro-silicone polymer achieves 0.2 g/L, complete separation of diesel oil and water can be performed within 23 s. Interfacial tension is not the main factor affecting the water separation efficacy. Effective water separation of this kind of polymer is mainly caused by reduction of viscoelasticity of the interfacial film.