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Relaxation dynamics of generalized scale-free polymer networks

机译:广义无标度聚合物网络的弛豫动力学

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摘要

We focus on treelike generalized scale-free polymer networks, whose geometries depend on a parameter, γ, that controls their connectivity and on two modularity parameters: the minimum allowed degree, Kmin, and the maximum allowed degree, Kmax. We monitor the influence of these parameters on the static and dynamic properties of the achieved generalized scale-free polymer networks. The relaxation dynamics is studied in the framework of generalized Gaussian structures model by employing the Rouse-type approach. The dynamical quantities on which we focus are the average monomer displacement under external forces and the mechanical relaxation moduli (storage and loss modulus), while for the static and structure properties of these networks we concentrate on the eigenvalue spectrum, diameter, and degree correlations. Depending on the values of network’s parameters we were able to switch between distinct hyperbranched structures: networks with more linearlike segments or with a predominant star or dendrimerlike topology. We have observed a stronger influence on Kmin than on Kmax. In the intermediate time (frequency) domain, all physical quantities obey power-laws for polymer networks with γ = 2.5 and Kmin = 2 and we prove additionally that for networks with γ ≥ 2.5 new regions with constant slope emerge by a proper choice of Kmin. Remarkably, we show that for certain values of the parameter set one may obtain self-similar networks.
机译:我们专注于树状广义无标度聚合物网络,其几何结构取决于控制其连接性的参数γ和两个模块性参数:最小允许度Kmin和最大允许度Kmax。我们监视这些参数对所获得的广义无标度聚合物网络的静态和动态特性的影响。在广义高斯结构模型的框架内,采用Rouse型方法研究了松弛动力学。我们关注的动态量是外力作用下的平均单体位移和机械弛豫模量(存储和损耗模量),而对于这些网络的静态和结构特性,我们专注于特征值谱,直径和度相关。根据网络参数的值,我们能够在不同的超支化结构之间切换:具有更多线性部分或具有星形或树状大分子拓扑结构的网络。我们发现对Kmin的影响比对Kmax的影响更大。在中间时间(频率)域中,对于γ= 2.5和Kmin = 2的聚合物网络,所有物理量均服从幂律,并且我们进一步证明,对于γ≥2.5的网络,通过适当选择Kmin会出现具有恒定斜率的新区域。值得注意的是,我们表明,对于参数集的某些值,可以得到自相似网络。

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