Chain conformation in two-dimensional dense state.
Chain conformation in two-dimensional dense state.
复制标题
二维致密状态的链构象。
DOI：
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发表时间：
2004
影响因子：
4.4
通讯作者：
V. J. Foltz
中科院分区：
文献类型：
--
作者：
Xiaorong Wang;V. J. Foltz
在努力提供证据有关的构象的许多链在严格的二维（2D）的密集状态，我们合成的直径为纳米的聚合物链通过阴离子聚合过程。从原子力显微镜观察中直接获得对应于链直径a的厚度h的膜中的长链分子的构象特征。在二维分散状态下，长链分子的构象为典型的高斯型。而在2D致密态下，长链分子相互渗透很强。它们的构象在很大程度上受到相邻链的干扰，并且不是高斯的。这一结果与de Gennes预测的分离球模型相矛盾。核心原因是二维空间不能用二维高斯球填充到正常密度;要么面积必须大大增加，从而产生大的空隙，要么球的构象必须通过允许链相互渗透来扩展。
In an effort to provide evidence concerning the conformation of many chains in strict two-dimensional (2D) dense state, we synthesized polymer chains of diameter of nanometers through an anionic polymerization process. The conformational characteristics of the long chain molecules in films of thickness h corresponding to the chain diameter a were directly obtained from atomic force microscopy observations. In 2D dispersed state, the conformations of the long chain molecules were typical Gaussian. However, in 2D dense state the long chain molecules were strongly interpenetrated. Their conformations were largely perturbed by the presence of neighbor chains and were not Gaussian. This result was in contradiction with the segregated globule model predicted by de Gennes. The central reason is that 2D space cannot be filled to normal density with 2D Gaussian globules; either the area must be greatly increased with consequently large voids, or the globule conformation must be expanded by allowing chains to interpenetrate each other.
影响因子：
3.4
作者：
Baumann, CG;Bloomfield, VA;Block, SM
通讯作者：
Block, SM