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Normal and lateral deformation of lyotropically ordered polymer brush

机译：溶致有序聚合物刷的法向和横向变形

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摘要

Planar polymer brush formed by semigrid chains of freely jointed rigid segments and immersed into a solvent is considered. Brush collapse induced by deterioration of the solvent quality and its deformation by external normal or lateral force is studied. It is demonstrated that these three different situations can be described in the framework of the common approach. It is shown that the collapse is accompanied by liquid crystalline (LC) ordering within the brush. The LC transition can be jump-like (the first order) or continuous, depending on the segment's aspect ratio and grafting density. Transition point is investigated in detail, the corresponding phase diagrams are calculated. It is shown that the phase diagrams of a normally 'leg' in the good solvent region for sparsely grafted brush, with two coexistance regions and a triple-point, in addition, for shorter segmant length or without these features if the chains are densely grafted. For the laterally deformed brush, phase diagrams have similar structures with a critical point in the good solvent regime.
机译：考虑了由自由连接的刚性链段的半网格链形成的平面聚合物刷，并浸入溶剂中。研究了由于溶剂质量变差而引起的电刷塌陷及其在外部法向力或横向力作用下的变形。证明了可以在通用方法的框架中描述这三种不同的情况。结果表明，塌陷伴随着刷子内的液晶（LC）有序排列。 LC过渡可以是跳跃状（一级），也可以是连续的，这取决于段的长宽比和接枝密度。详细研究过渡点，计算出相应的相图。结果表明，对于稀疏接枝的刷子，良好溶剂区域中的正常“腿”的相图具有两个共存区域和一个三点，另外，对于较短的节段长度或如果这些链被密集接枝，则没有这些特征。对于横向变形的刷子，相图具有相似的结构，并且在良好的溶剂状态下具有临界点。

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