Primitive chain network simulations for comb-branched polymer under step shear deformations
Primitive chain network simulations for comb-branched polymer under step shear deformations
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梳状支化聚合物阶梯剪切变形下的原始链网络模拟
DOI：
10.1007/s00397-011-0574-x
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
and Y. Togawa
中科院分区：
文献类型：
--
作者：
Y. Masubuchi;Y. Matsumiya;H. Watanabe;S. Shiromoto;M. Tsutsubuchi;and Y. Togawa
多支化聚合物如梳形聚合物在阶跃剪切变形下的松弛模量的阻尼比线性聚合物弱。这种弱阻尼与分级松弛有关，分支臂松弛发生在主链松弛之前，并且使缠结网络扩张以用于主链松弛/收缩。相应的模型已被提出，并有利地与阻尼函数的数据进行比较。然而，在模型中没有考虑由于大变形而导致的膨胀的增强，已知线性聚合物会发生大变形以影响链收缩速率。因此，在本文中，我们研究了膨胀的梳形聚合物下变形的3D多链sliplink模拟的帮助下，自然占膨胀由于通过许多链动力学的约束释放。第一次证实了模拟再现了梳形聚异戊二烯的线性和非线性粘弹性数据（柯克伍德等人，大分子42：9592-9608，2009）。变形下的扩张的幅度进行了检查的生存概率的sliplinks。事实证明，由臂松弛激活的梳状骨架的膨胀通过短时间的变形而增强，但在长时间内骨架松弛并且阻尼函数被定义。这一结果支持了传统模型。
The damping of the relaxation modulus under step shear deformation is weaker for multi-branched polymers such as comb polymers than for linear polymers. This weak damping has been related to the hierarchical relaxation, the branched arm relaxation occurring prior to the backbone relaxation and dilating the entanglement network for the backbone relaxation/contraction. A corresponding model has been proposed and favorably compared with the data for the damping function. However, the enhancement of dilation due to large deformation, known to occur for linear polymers to affect the chain contraction rate, was not considered in the model. Thus, in this paper, we investigated the dilation for a comb polymer under deformation with the aid of a 3D multichain sliplink simulation that naturally accounts for the dilation due to the constraint release through the many chain dynamics. The simulation was confirmed, to the first time, to reproduce the linear and nonlinear viscoelastic data for a comb polyisoprene (Kirkwood et al., Macromolecules 42:9592–9608, 2009). A magnitude of dilation under deformation was examined for the survival probability of the sliplinks. It turned out that the dilation for the comb backbone activated by the arm relaxation is enhanced by the deformation at short times but not at long times where the backbone relaxes and the damping function is defined. This result lends support to the conventional model.
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影响因子：
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DOI：
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发表时间：
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