科研之友
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摘要
In geometries capable of producing uniform shear stress across the gap such as cone-plate, it is a challenge to study the nonlinear rheology of well-entangled polymers without wall slip and edge fracture. The task to obtain meaningful steady-state information is particularly daunting. Significant insights are required in the design of experiments and choice of reliable apparatuses that could ful-fill the objective to determine the constitutive behavior. In a recent published article, Hu J. Rheol. 54, 1307-1323 (2010) reported particle-imaging velocimetric measurements of two highly entangled polybutadiene solutions with a cocylinder geometry. One of the solutions was prepared and provided to Hu by Ravindranath from the University of Akron. Rheological and particle-tracking velocimetric studies have been carried out on the same sample in our laboratory. In this letter, we will compare Hu's results with our own measurements, clarify a few misrepresentations, and discuss several important issues concerning shear banding in entangled polymers. VC 2012 The Society of Rheology. [http://dx.doi.org/10.1122/1.4708515]
- 出版日期2012-7
