Nonlinear rheology of model comb polymers
Nonlinear rheology of model comb polymers
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DOI：
10.1122/1.3191781
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发表时间：
2009-09
影响因子：
3.3
通讯作者：
M. Kapnistos;K. Kirkwood;Jorge Ramírez;D. Vlassopoulos;L. Leal
中科院分区：
文献类型：
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作者：
M. Kapnistos;K. Kirkwood;Jorge Ramírez;D. Vlassopoulos;L. Leal
我们测量了线性梳状聚合物溶液在大幅阶跃剪切应变后的应力松弛。我们应用时间-温度叠加原理来构建应力松弛主曲线，该曲线在时间上跨越多个数量级，并涵盖从早期分支回缩到骨干爬行的整个梳状松弛。我们发现了明显的松弛过程和动态管膨胀的证据，这可归因于聚合物的结构特征。
We measure the stress relaxation of linear comb polymer solutions, after a large amplitude step shear strain. We apply the time-temperature superposition principle in order to construct stress relaxation master curves that span many orders of magnitude in time and cover the entire comb relaxation from early branch retraction to backbone reptation. We find evidence of distinct relaxation processes and dynamic tube dilation that can be attributed to the architectural features of the polymer.