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首页> 外文期刊>The Journal of Chemical Physics >New strategy to create ultra-thin surface layer of grafted amphiphilic macromolecules
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New strategy to create ultra-thin surface layer of grafted amphiphilic macromolecules

机译：创建超薄两亲大分子表面层的新策略

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摘要

It was found first that macromolecules made of amphiphilic monomer units could form spontaneously an ultra-thin layer on the surface which the macromolecules are grafted to. The width of such layer is about double size of monomer unit consisting of hydrophilic A (repulsive) and hydrophobic (attractive) B beads. The hydrophilic A beads are connected in a polymer chain while hydrophobic B beads are attached to A beads of the backbone as side groups. Three characteristic regimes are distinguished. At low grafting density, the macromolecules form ultra-thin micelles of the shape changing with decrease of distance d between grafting points as following: circular micelles-prolonged micelles-inverse micelles-homogeneous bilayer. Those micelles have approximately constant height and specific top-down A-BB-A structure. At higher grafting density, the micelles start to appear above the single bilayer of amphiphilic macromolecules. The thickness of grafted layer in these cases is different in different regions of grafting surface. Only at rather high density of grafting, the height of macromolecular layer becomes uniform over the whole grafting surface. The study was performed by computer modeling experiments and confirmed in framework of analytical theory. (C) 2015 AIP Publishing LLC.
机译：首先发现，由两亲性单体单元制成的大分子可以在接枝大分子的表面上自发形成超薄层。这种层的宽度约为由亲水性A（排斥性）和疏水性（有吸引力）B珠组成的单体单元的两倍大小。亲水性A珠在聚合物链中连接，而疏水性B珠作为侧基附接到骨架的A珠上。区分了三种特征机制。在低接枝密度下，大分子形成的超薄胶束的形状随着接枝点之间距离d的减小而改变，其变化如下：圆形胶束-延长的胶束-反胶束-均质的双层。这些胶束具有大致恒定的高度和特定的自上而下的A-BB-A结构。在较高的接枝密度下，胶束开始出现在两亲大分子的单个双层上方。在这些情况下，接枝层的厚度在接枝表面的不同区域是不同的。仅在相当高的接枝密度下，大分子层的高度在整个接枝表面上才变得均匀。该研究是通过计算机建模实验进行的，并在分析理论的框架内得到证实。 （C）2015 AIP Publishing LLC。

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