A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Vavilova ul. 28, Moscow 119991, Russia.
J Colloid Interface Sci. 2021 Mar;585:408-419. doi: 10.1016/j.jcis.2020.11.083. Epub 2020 Nov 26.
At selective liquid-liquid interface, amphiphilic homopolymers, having groups with different affinity for the liquids in each monomer unit, would demonstrate higher occupation of the interfacial layer than copolymers with various distributions of groups and be advantageous as interface stabilizers.
By means of Langevin dynamics computer simulation, conformations of multiple chains of amphiphilic macromolecules adsorbed at the liquid-liquid interface were studied. Monomer units having different affinity for the liquids were distributed variously along the polymer chains. Homopolymers, amphiphilic at the level of an individual monomer unit, and copolymers with random, altermating and multiblock distribution of groups were considered. The surface coverage, structure of the layer, and spatial distribution of monomer units were investigated depending on the polymer concentration.
Compared to copolymers with random, alternating and multiblock distributions of the groups, the interfacial layer concentration of amphiphilic homopolymer is about 1.5 times higher, the adsorbed layer is remarkably thinner, has membrane-like structure and is asymmetric with respect to interface boundary. Also, the adsorbed amphiphilic homopolymers form fewer loops and tails, most located on one side of the interface. This combination of properties is promising for practical application in modern self-assembling molecular devices.
在选择性的液-液界面上，具有每个单体单元中对液体具有不同亲和力基团的两亲性均聚物，将比具有各种基团分布的共聚物更有利于占据界面层，并且作为界面稳定剂具有优势。
通过 Langevin动力学计算机模拟，研究了吸附在液-液界面上的多链两亲性高分子的构象。具有不同亲液性的单体单元沿聚合物链分布不均。研究了在单体单元水平上具有两亲性的均聚物，以及具有无规、交替和多嵌段基团分布的共聚物。根据聚合物浓度，研究了表面覆盖率、层结构和单体单元的空间分布。
与具有无规、交替和多嵌段基团分布的共聚物相比，两亲性均聚物的界面层浓度约高 1.5 倍，吸附层明显更薄，具有膜状结构，并且相对于界面边界不对称。此外，吸附的两亲性均聚物形成的环和尾较少，大多数位于界面的一侧。这些性质的组合有望在现代自组装分子器件的实际应用中得到应用。
