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arXiv 0708.0799cond-mat.soft
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模式耦合理论在polymer二元混溶体系中的简单模型检验

Tests of mode coupling theory in a simple model for two-component miscible polymer blends

A. J. Moreno, J. Colmenero

摘要:

本文采用分子动力学模拟方法研究了聚合物共混物中一个简单的珠-弹簧模型的结构弛豫。不同单体尺寸的引入引起两种组分的动力学的大时间尺度分离。模拟结果的一个大的可观测探测密度相关性,劳斯模式,和方向的债券和链端到端的矢量,模式耦合理论(MCT)的框架内进行了分析。获得了异常大的指数参数值。这一特征表明,动态停搏可能存在潜在的高阶MCT方案。

英文摘要:

We present molecular dynamics simulations on the structural relaxation of a simple bead-spring model for polymer blends. The introduction of a different monomer size induces a large time scale separation for the dynamics of the two components. Simulation results for a large set of observables probing density correlations, Rouse modes, and orientations of bond and chain end-to-end vectors, are analyzed within the framework of the Mode Coupling Theory (MCT). An unusually large value of the exponent parameter is obtained. This feature suggests the possibility of an underlying higher-order MCT scenario for dynamic arrest.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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