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Viscoelastic dynamic properties of heterogeneous polymer networks with domain structure

机译：具有域结构的非均质聚合物网络的粘弹性动力学性质

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A dynamic model of a heterogeneous polymer network system is proposed. A polymer network is presented as an ensemble of cross-linked regions (domains) of different sizes, the domains have similarly regular internal structures. To a first approximation, these domains are treated independently of each other. Relaxation modulus, storage modulus, and loss modulus of the heterogeneous polymer network are calculated. for the purpose of averaging over all network domains the exponential number distribution of chain segments in domains is used. This type of distribution has been previously proposed by one of the authors in the frame of the aggregation model. It is shown that a structure heterogeneity introduced into a network model according to the above domain approach leads, at long times, to the stretched exponential type of time dependence of relaxation modulus instead of the power-law dependence predicted by the theories dealing with regular networks. The network heterogeneity also leads to a more rapid decrease in the storage modulus in the region of low frequencies, as compared with regular polymer networks. It is shown that the loss modulus in the region of its maximum is very slightly sensitive to the "long-range" network heterogeneity considered. [References: 32]
机译：提出了异构聚合物网络系统的动力学模型。聚合物网络以不同大小的交联区域（域）的整体呈现，该域具有相似的规则内部结构。初步近似地，这些域彼此独立地对待。计算了非均相聚合物网络的弛豫模量，储能模量和损耗模量。为了在所有网络域上平均，使用了域中链段的指数分布。一位作者先前在聚合模型的框架中提出了这种分布类型。结果表明，根据上述领域方法引入网络模型的结构异质性长期导致弛豫模量的时间依赖性的拉伸指数类型，而不是规则网络理论预测的幂律依赖性。 。与常规聚合物网络相比，网络异质性还导致低频区域的储能模量更快下降。结果表明，在最大范围内的损耗模量对所考虑的“远程”网络异质性非常敏感。 [参考：32]

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