Critical conditions for structure formation in semidilute polymer solutions induced under continuous shear flow
Critical conditions for structure formation in semidilute polymer solutions induced under continuous shear flow
复制标题
连续剪切流诱导的半稀聚合物溶液中结构形成的关键条件
DOI：
10.1063/1.1372330
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发表时间：
2001
影响因子：
4.4
通讯作者：
T. Hashimoto
中科院分区：
文献类型：
--
作者：
S. Saito;T. Hashimoto
用光散射和流变学方法研究了以邻苯二甲酸二辛酯为溶剂的聚苯乙烯半稀溶液中剪切诱导结构形成的临界条件。研究了浓度波动非线性增强（定义见本文）的临界剪切速率γcx随温度和浓度的变化。γcx随温度的升高或浓度的降低而增大，反映了热力学和粘弹性性质的温度和浓度依赖性。发现γcx的这种温度和浓度依赖性与浓度波动线性增强（也在文中定义）的临界剪切速率的依赖性平行，这可以用Onuki提出的线性理论来解释。本文还探讨了与γcx相对应的临界剪应力和临界第一法向应力差，并讨论了其物理解释。
Critical conditions for shear-induced structure formation in semidilute polystyrene solutions with dioctyl phthalate as a solvent are studied by light scattering and rheological measurement. The critical shear rate γcx for the onset of the nonlinear enhancement (defined in the text) of the concentration fluctuations are investigated as functions of temperature and concentration. γcx increases with increasing temperature or decreasing concentration, reflecting the temperature and concentration dependence of the thermodynamic and viscoelastic properties. This temperature and concentration dependence of γcx was found to be in parallel to that of the critical shear rate for the onset of the linear enhancement (also defined in the text) of the concentration fluctuations, which can be explained in terms of a linear theory proposed by Onuki. The critical shear stress and the critical first normal stress difference corresponding to γcx are also explored, the physical interpretation of which will be discussed ...