具有异质半柔性的链和树枝状分子的动力学。

Dynamics of chains and dendrimers with heterogeneous semiflexibility.

机构信息

Theoretical Polymer Physics, University of Freiburg, Hermann-Herder-Str. 3, D-79104 Freiburg, Germany.

出版信息

J Chem Phys. 2010 Mar 28;132(12):124905. doi: 10.1063/1.3366662.

PMID:20370148

Abstract

Based on our recent model for the dynamics of semiflexlible treelike networks [M. Dolgushev and A. Blumen, J. Chem. Phys. 131, 044905 (2009)], we study the dynamical properties of chain polymers and of dendrimers whose junctions display different stiffness degrees (SD). In these polymers the functionality f of the inner junctions is constant, being f=2 for the linear chains and f=3 for the dendrimers. This allows us to focus on the effects caused by the heterogeneities due to different SD. For this we study alternating, diblock, as well as random arrangements of the SD. Each of these cases shows a particular, macroscopically observable behavior, which allows to distinguish between the different microscopic SD arrangements.

摘要

基于我们最近提出的半柔性树状网络动力学模型[M. Dolgushev 和 A. Blumen, J. Chem. Phys. 131, 044905 (2009)]，我们研究了链状聚合物和支化聚合物的动力学性质，这些聚合物的连接点具有不同的刚度程度（SD）。在这些聚合物中，内部连接点的官能度 f 是常数，线性链的 f=2，而支化聚合物的 f=3。这使得我们能够专注于由于不同 SD 引起的非均匀性的影响。为此，我们研究了交替、二嵌段和随机排列的 SD。这些情况中的每一种都表现出一种特殊的、宏观上可观察到的行为，这使得我们能够区分不同的微观 SD 排列。