Sliding grafted polymer layers
Sliding grafted polymer layers
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DOI：
10.1021/ma047786w
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发表时间：
2005-02-22
期刊：
影响因子：
5.5
通讯作者：
Marques, CM
中科院分区：
文献类型：
--
作者：
Baulin, VA;Johner, A;Marques, CM
我们从理论上研究了滑动接枝聚合物层或SGP层的结构。这些界面结构是通过用环糊精等环状分子将每个聚合物连接到底物上而建立的。这种拓扑接枝模式允许链沿着附着点自由滑动。通过笨重的盖子组防止从滑动链节中逃脱。我们发现，蘑菇型的嫁接主要采用对称构型(具有相似的分支大小)，而在致密层中的嫁接是高度不对称的，因此每个嫁接只有一个分支参与到层中。小胶体或星状滑动胶束上的滑动层表现出一种中间行为，参与日冕的较长分支的数量与分支总数无关。这一制度也存在于含有较少链的滑动表面胶束，但它更窄。
We study theoretically the structure of sliding grafted polymer layers, or SGP layers. These interfacial structures are built by attaching each polymer to the substrate with a ringlike molecule such as cyclodextrins. Such a topological grafting mode allows the chains to freely slide along the attachment point. Escape from the sliding link is prevented by bulky capping groups. We show that grafts in the mushroom regime adopt mainly symmetric configurations (with comparable branch sizes), while grafts in dense layers are highly dissymmetric so that only one branch per graft participates in the layer. Sliding layers on small colloids or starlike sliding micelles exhibit an intermediate behavior, where the number of longer branches participating in the corona is independent of the total number of branches. This regime also exists for sliding surface micelles comprising less chains, but it is narrower.