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arXiv 0910.3168cond-mat.soft
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界面聚合物的多尺度模拟

Multiscale modeling of polymers at interfaces

Fathollah Varnik, Kurt Binder

摘要:

简要回顾了界面聚合物研究的建模和模拟方法。当研究真实的聚合物系统所提供的真正的多尺度问题时,粗粒化实际上是不可避免的。在这个过程中,在较小的尺度上的自由度被消除,有利于一个模型适合于有效地研究系统的行为在更大的长度和时间尺度。我们强调需要区分动态和静态属性的模型验证。当涉及到系统的动态行为时,精确再现静态特性的模型可能完全失败。此外,我们评论了Monte Carlo方法在高分子科学中的使用相比,分子动力学模拟。使用后一种方法,我们还讨论了最近的计算机模拟结果的性质接近固体基板的聚合物。这包括通用特征(如在更简单的分子模型的情况下也观察到的)以及聚合物的特定性质。通过为这些观察提供实验证据,突出了计算机模拟的预测能力。这些结果的一些重要意义的理解薄的聚合物薄膜和涂层的机械性能也制定了。

英文摘要:

A brief review of modeling and simulation methods for a study of polymers at interfaces is provided. When studying truly multiscale problems as provided by realistic polymer systems, coarse graining is practically unavoidable. In this process, degrees of freedom on smaller scales are eliminated to the favor of a model suitable for efficient study of the system behavior on larger length and time scales. We emphasize the need to distinguish between dynamic and static properties regarding the model validation. A model which accurately reproduces static properties may fail completely, when it comes to the dynamic behavior of the system. Furthermore, we comment on the use of Monte Carlo method in polymer science as compared to molecular dynamics simulations. Using the latter approach, we also discuss results of recent computer simulations on the properties of polymers close to solid substrates. This includes both generic features (as also observed in the case of simpler molecular models) as well as polymer specific properties. Predictive power of computer simulations is highlighted by providing experimental evidence for these observations. Some important implications of these results for an understanding of mechanical properties of thin polymer films and coatings are also worked out.

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