Nonmonotonic dependence of comb polymer relaxation on branch density in semidilute solutions of linear polymers
Nonmonotonic dependence of comb polymer relaxation on branch density in semidilute solutions of linear polymers
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DOI：
10.1103/physrevfluids.5.121301
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发表时间：
2020-12-17
影响因子：
2.7
通讯作者：
Schroeder, Charles M.
中科院分区：
文献类型：
--
作者：
Patel, Shivani F.;Young, Charles D.;Schroeder, Charles M.
支化聚合物在半稀释溶液中的动力学被认为取决于聚合物链结构、分子间排斥体积相互作用和长程流体动力学相互作用（HI）之间的耦合。然而，由于流动中非线性聚合物拓扑结构的分子内和分子间HI和链-链相互作用的影响，定量地理解这些现象一直具有挑战性。在这项工作中，我们直接观察梳形聚合物在线性聚合物的半稀溶液中的弛豫动力学使用单分子实验和分子模拟。实验结果直接通过线性聚合物半稀释溶液中梳形聚合物的粗粒度模拟得到补充，包括长程HI和排除的体积相互作用。我们的研究结果表明，梳形聚合物的弛豫时间上的分支密度，由于流体动力学屏蔽和聚合物结构之间的微妙而重要的相互作用出现了意想不到的非单调依赖。
The dynamics of branched polymers in semidilute solutions are thought to depend on a coupling between polymer chain architecture, intermolecular excluded volume interactions, and long-range hydrodynamic interactions (HI). However, it has been challenging to quantitatively understand these phenomena due to the influence of intra- and intermolecular HI and chain-chain interactions for nonlinear polymer topologies in flow. In this work, we directly observe the relaxation dynamics of comb-shaped polymers in semidilute solutions of linear polymers using single molecule experiments and molecular simulations. Experimental results are directly complemented by coarse-grained simulations of comb polymers in semidilute solutions of linear polymers including long-range HI and excluded volume interactions. Our results show an unexpected nonmonotonic dependence of comb polymer relaxation time on branch density that arises due to a subtle yet important interplay between hydrodynamic shielding and polymer architecture.