使用中子自旋回波光谱法直接测量剪切作用下聚合物中的拓扑相互作用。

Direct measurement of topological interactions in polymers under shear using neutron spin echo spectroscopy.

作者信息

Kawecki Maciej, A Adlmann Franz, Gutfreund Philipp, Falus Peter, Uhrig David, Gupta Sudipta, Farago Bela, Zolnierczuk Piotr, Cochran Malcom, Wolff Max

机构信息

Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-75120, Uppsala, Sweden.

Institute Laue Langevin (ILL), 71 Avenue des Martyrs, 38000, Grenoble, France.

出版信息

Sci Rep. 2019 Feb 26;9(1):2823. doi: 10.1038/s41598-019-39437-2.

DOI:10.1038/s41598-019-39437-2

PMID:30808946

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6391414/

Abstract

We present in-situ neutron spin echo measurements on an entangled polydimethylsiloxane melt under shear and demonstrate the ability to monitor nano-scale dynamics in flowing liquids. We report no changes in the topological interactions of the chains for shear rates approaching the inverse longest relaxation time. Further experiments following along this line will allow to systematically test the predictions of theories, like e.g. convective constraint release.

摘要

我们展示了在剪切作用下对纠缠的聚二甲基硅氧烷熔体进行的原位中子自旋回波测量，并证明了监测流动液体中纳米尺度动力学的能力。我们报告，对于接近最长弛豫时间倒数的剪切速率，链的拓扑相互作用没有变化。沿着这条线进行的进一步实验将能够系统地检验诸如对流约束释放等理论的预测。