Concentration dependence of rheological properties of telechelic associative polymer solutions
Concentration dependence of rheological properties of telechelic associative polymer solutions
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DOI：
10.1103/physreve.86.031802
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发表时间：
2012-09-06
影响因子：
2.4
通讯作者：
Watanabe, Hiroshi
中科院分区：
文献类型：
--
作者：
Uneyama, Takashi;Suzuki, Shinya;Watanabe, Hiroshi
我们考虑缔合遥螺旋聚合物溶液的流变性与浓度的依赖关系。模型遥螺旋聚合物溶液的实验结果显示出较强的流变性浓度依赖性。对于浓度相对较高的溶液，线性粘弹性偏离了单一的Maxwell行为。在高浓度和低浓度情况下，特征弛豫时间和模数的浓度依赖关系不同。这些结果表明，存在两种不同的浓度体系。我们预计，在高浓度溶液中形成密集连接(良好渗透)的网络，而在低浓度溶液中形成稀疏连接(弱渗透)网络。我们提出了单链型暂态网络模型来解释实验结果。我们的模型包含了胶束核的空间相关性效应和每个胶束核的平均弹性活性链数(网络功能)。我们的模型可以再现非单一的麦克斯韦弛豫和剪切增稠变稀等非线性流变行为。它们与实验结果定性一致。在我们的模型中，线性流变行为主要归因于网络结构(功能)的不同。这种非线性流变行为是由于胶束核位置的空间相关性对流量的非线性依赖。
We consider concentration dependence of rheological properties of associative telechelic polymer solutions. Experimental results for model telechelic polymer solutions show rather strong concentration dependence of rheological properties. For solutions with relatively high concentrations, linear viscoelasticity deviates from the single Maxwell behavior. The concentration dependence of characteristic relaxation time and moduli is different in high-and low-concentration cases. These results suggest that there are two different concentration regimes. We expect that densely connected (well percolated) networks are formed in high-concentration solutions, whereas sparsely connected (weakly percolated) networks are formed in low-concentration solutions. We propose single chain type transient network models to explain experimental results. Our models incorporate the spatial correlation effect of micellar cores and average number of elastically active chains per micellar core (the network functionality). Our models can reproduce nonsingle Maxwellian relaxation and nonlinear rheological behavior such as the shear thickening and thinning. They are qualitatively consistent with experimental results. In our models, the linear rheological behavior is mainly attributable to the difference of network structures (functionalities). The nonlinear rheological behavior is attributable to the nonlinear flow rate dependence of the spatial correlation of micellar core positions.