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arXiv 1004.0277cond-mat.soft
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二元Polymer混合体系的有效软核势和介观模拟

Effective Soft-Core Potentials and Mesoscopic Simulations of Binary Polymer Mixtures

J. McCarty, I. Y. Lyubimov, M. G. Guenza

摘要:

介观分子动力学模拟用于确定各种化学结构、浓度和热力学条件的几种二元聚合物混合物的大尺度结构。通过实施的分析形式主义,这是基于解决方案的Ornstein-Zernike方程,每个聚合物链映射到一个单一的软胶体的水平。从适当的封闭关系,有效的,软核之间的潜力粗粒度的单位,并作为输入到我们的中尺度模拟。以这种方式得到的潜力是分析和明确的参数依赖,使其通用和转移到许多系统的利益。从在各种热力学条件下进行的计算机模拟的聚合物混合物的结构,通过对关联函数,确定在整个混溶区域的相图。在非热制度中尺度模拟表现出定量协议与联合原子模拟。此外,它们还提供了比联合原子模拟和接近相变的热状态所能达到的更大尺度的信息。

英文摘要:

Mesoscopic molecular dynamics simulations are used to determine the large scale structure of several binary polymer mixtures of various chemical architecture, concentration, and thermodynamic conditions. By implementing an analytical formalism, which is based on the solution to the Ornstein-Zernike equation, each polymer chain is mapped onto the level of a single soft colloid. From the appropriate closure relation, the effective, soft-core potential between coarse-grained units is obtained and used as input to our mesoscale simulations. The potential derived in this manner is analytical and explicitly parameter dependent, making it general and transferable to numerous systems of interest. From computer simulations performed under various thermodynamic conditions the structure of the polymer mixture, through pair correlation functions, is determined over the entire miscible region of the phase diagram. In the athermal regime mesoscale simulations exhibit quantitative agreement with united atom simulations. Furthermore, they also provide information at larger scales than can be attained by united atom simulations and in the thermal regime approaching the phase transition.

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