Dynamics of semiflexible regular hyperbranched polymers

Dynamics of semiflexible regular hyperbranched polymers
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DOI:
10.1063/1.4775584
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发表时间:
2013-01-21
影响因子:
4.4
通讯作者:
Blumen, Alexander
Blumen, Alexander
中科院分区:
化学2区
文献类型:
--
作者:
Fuerstenberg, Florian;Dolgushev, Maxim;Blumen, Alexander

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我们按照 Dolgushev 和 Blumen 建立的框架研究半柔性 Vicsek 分形 (SVF) 的动力学 [J.化学。物理。 131, 044905 (2009)],该方案允许对任意结构的半柔性树状聚合物进行建模。我们展示了,扩展了 Furstenberg 等人用于处理半柔性树枝状聚合物的方法。 [J。化学。物理。 136, 154904 (2012)],通过这种方式,SVF 的 Langevin 动力学可以在很大程度上进行分析处理。为此,我们展示了对于任意维切克分形(VF)如何构造完整的特征向量集;这些大大减少了相应运动方程的对角化问题。事实上,这样的特征向量集自然地产生于遵循 VF 迭代构造的分层过程。我们使用获得的特征值来计算不同刚度连接处的 SVF 损耗模量 G''(omega)。最后,我们将 SVF 的结果与半柔性树枝状聚合物的结果进行比较。 (C) 2013 年美国物理研究所。 [http://dx.doi.org/10.1063/1.4775584]
We study the dynamics of semiflexible Vicsek fractals (SVF) following the framework established by Dolgushev and Blumen [J. Chem. Phys. 131, 044905 (2009)], a scheme which allows to model semiflexible treelike polymers of arbitrary architecture. We show, extending the methods used in the treatment of semiflexible dendrimers by Furstenberg et al. [J. Chem. Phys. 136, 154904 (2012)], that in this way the Langevin-dynamics of SVF can be treated to a large part analytically. For this we show for arbitrary Vicsek fractals (VF) how to construct complete sets of eigenvectors; these reduce considerably the diagonalization problem of the corresponding equations of motion. In fact, such eigenvector sets arise naturally from a hierarchical procedure which follows the iterative construction of the VF. We use the obtained eigenvalues to calculate the loss moduli G ''(omega) of SVF for different degrees of stiffness of the junctions. Finally, we compare the results for SVF to those found for semiflexible dendrimers. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4775584]