Driven Translocation of Linked Ring Polymers through a Pore,Macromolecules

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Driven Translocation of Linked Ring Polymers through a Pore
Macromolecules ( IF 5.1 ) Pub Date : 2017-11-22 00:00:00 , DOI: 10.1021/acs.macromol.7b02023
M. Caraglio ₁ , E. Orlandini ₂ , S. G. Whittington ₃

Affiliation

We have carried out a systematic computational investigation of the driven translocation dynamics of mutually entangled pairs of flexible polymers. Once closed into rings the entanglement is locked into topological links, and our results show that the presence of a topological (i.e., not removable) obstruction of this type at the pore dramatically slows down the translocation dynamics. The stalling time at the pore depends strongly on the complexity of the link type and corresponds to the time needed to squeeze the linked portion inside the pore. A notable feature is that unlike the translocation of knotted polymers, the passage of the portion of a two-component link that contains the essential crossings typically occurs when the translocation process is half completed. We claim that this difference can be exploited to distinguish knots from links by translocation experiments. These features should help to advance the interpretation and design of future translocation experiments aimed at probing the presence and amount of mutual entanglement in concatenated ring polymers.

中文翻译：

连接的环状聚合物通过孔的驱动移位

我们已经对相互缠结的柔性聚合物对的驱动移位动力学进行了系统的计算研究。一旦闭合成环，纠缠就被锁定在拓扑链接中，并且我们的结果表明，这种类型的拓扑（即，不可移动的）阻塞在孔隙处的存在极大地减慢了迁移动力学。在孔处的停顿时间在很大程度上取决于连接类型的复杂性，并且对应于在孔内挤压连接部分所需的时间。一个显着的特征是，与打结的聚合物的移位不同，包含基本交叉的两部分链接部分的通过通常在移位过程完成一半时发生。我们声称，可以利用这种差异通过易位实验从链接中区分出结。这些特征应有助于推进旨在研究级联环聚合物中相互缠结的存在和数量的未来易位实验的解释和设计。

更新日期：2017-11-22

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