STRONGLY STRETCHED POLYMER BRUSHES
STRONGLY STRETCHED POLYMER BRUSHES
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DOI：
10.1002/polb.1994.090321620
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发表时间：
1994-12-01
影响因子：
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通讯作者：
MILNER, ST
中科院分区：
文献类型：
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作者：
MILNER, ST
当长链分子以某种方式在界面的一端以相对较小的面积连接在一起时，聚合物“刷”就形成了。在溶剂的存在下，这种吸附刷子可用于修饰表面性质，稳定胶体颗粒等。强烈分离的嵌段共聚物相或这种“聚合表面活性剂”的界面层也可以根据“熔融刷”（即无溶剂刷）进行建模。在这两种情况下，当链附件在界面上拥挤时，链会伸展以避开相邻的链。由此产生的物理状态具有明显不同于聚合物溶液、凝胶或弱吸附聚合物层的性质。当链被强力拉伸时，它们的统计力学变得更简单，因为围绕最可能构象的波动被抑制了。这使得许多笔刷性能的铅笔和纸计算成为可能，包括弯曲和压缩模量，以及链构象的详细知识。作为最近的一个例子，我将描述包括双连续双金刚石相在内的强分离嵌段共聚物的相图计算。(C) 1994 John Wiley and Sons, Inc。
Polymer ''brushes'' are formed when long-chain molecules are somehow attached by one end at an interface with a relatively small area per chain. Such adsorbed brushes in the presence of solvent may be used to modify surface properties, stabilize colloidal particles, etc. Strongly segregated block copolymer phases, or interfacial layers of such ''polymeric surfactants'' may also be modeled in terms of ''melt brushes,'' (i.e., brushes without solvent). In both cases, when chain attachments are crowded on the interface, the chains stretch out to avoid neighboring chains. The resulting physical state has properties markedly different from polymer solutions, gels, or weakly adsorbed polymer layers. When the chains are strongly stretched, their statistical mechanics become simpler, as fluctuations around the set of most probable conformations are suppressed. This makes possible many pencil-and-paper calculations of brush properties, including bending and compressional moduli, and detailed knowledge of the chain conformations. As a recent example, I will describe calculations of phase diagrams of strongly segregated block copolymers including bicontinuous double-diamond phases. (C) 1994 John Wiley and Sons, Inc.