螺旋缔合Polymer溶液流变性质的浓度依赖性
Concentration Dependence of Rheological Properties of Telechelic Associative Polymer Solutions
摘要：
我们考虑缔合遥爪聚合物溶液的流变性质的浓度依赖性。模型遥爪聚合物溶液的实验结果表明，相当强的浓度依赖性的流变性能。对于相对高浓度的溶液，线性粘弹性偏离单一的麦克斯韦行为。在高浓度和低浓度情况下，特征弛豫时间和模量的浓度依赖性是不同的。这些结果表明，有两个不同的浓度制度。我们预计，在高浓度溶液中形成密集连接（良好的连接）的网络，而在低浓度溶液中形成稀疏连接（弱连接）的网络。我们提出单链型瞬态网络模型来解释实验结果。我们的模型结合了胶束核心的空间相关效应和每个胶束核心的弹性活性链的平均数量（网络功能）。我们的模型可以再现非单一的麦克斯韦松弛和非线性流变行为，如剪切增稠和变稀。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（官能度）的差异。非线性流变行为归因于胶束核心位置的空间相关性的非线性流速依赖性。
英文摘要：
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 non-single 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.
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