An Alternative Explanation of the Microscopic Dynamics of Cyclic Polymers

IF 1.8 4区 工程技术 Q3 POLYMER SCIENCE
Kia L. Ngai
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引用次数: 0

Abstract

According to recent reviews and experiments, some key dynamic properties of cyclic polymers from neutron spin echo spectroscopy, molecular dynamics simulations, and rheological measurements are at variance with the predictions from theories based on motions restricted by fixed obstacles. These dynamic properties including non-Gaussianity, heterogeneity, and subdiffusive center of mass mean square displacements turn out to be hallmarks of cooperative dynamics found in entangled linear polymers, and in other many-units interacting systems that are not polymers. The current situation suggests new theory emphasizing that cooperative many-chain dynamics is needed to explain the properties. The Coupling Model is such a theory. Its predictions are applied to the dynamic properties of cyclic polymers here to show consistency with experiments and simulations.

Abstract Image

循环聚合物微观动力学的另一种解释
根据最近的综述和实验,从中子自旋回波光谱学、分子动力学模拟和流变学测量中得出的环状聚合物的一些关键动态特性与基于受固定障碍物限制的运动的理论预测不同。这些动态特性包括非高斯性、异质性和亚扩散质心均方根位移,它们是纠缠线性聚合物和其他非聚合物的多单元相互作用系统中发现的合作动力学的特征。目前的情况表明,需要强调多链协同动力学的新理论来解释这些特性。耦合模型就是这样一种理论。本文将其预测应用于环状聚合物的动态特性,以显示与实验和模拟的一致性。本文受版权保护。
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来源期刊
Macromolecular Theory and Simulations
Macromolecular Theory and Simulations 工程技术-高分子科学
CiteScore
3.00
自引率
14.30%
发文量
45
审稿时长
2 months
期刊介绍: Macromolecular Theory and Simulations is the only high-quality polymer science journal dedicated exclusively to theory and simulations, covering all aspects from macromolecular theory to advanced computer simulation techniques.
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