Startup shear of a highly entangled polystyrene solution deep into the nonlinear viscoelastic regime

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• 作者：Yanfei Li ; Gregory B. McKenna
• 关键词：Melt flow instability ; Edge fracture ; Shear banding ; Nonlinear rheology ; Wall slip ; Entangled polymer
• 刊名：Rheologica Acta
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：54
• 期：9-10
• 页码：771-777
• 全文大小：707 KB
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• 作者单位：Yanfei Li (1)
  Gregory B. McKenna (1)
  
  1. Department of Chemical Engineering, Edward E. Whitacre, Jr. College of Engineering, Texas Tech University, Lubbock, TX, 79409, USA
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Characterization and Evaluation Materials
  Polymer Sciences
  Mechanical Engineering
  Soft Matter and Complex Fluids
  Food Science
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-1528

文摘

We have employed optical particle tracking velocimetry to directly visualize the deformation field of a highly entangled polystyrene/diethyl phthalate (PS/DEP) solution (entanglement density Z--1) in a parallel plate geometry. To probe the existence of shear banding, startup shear tests were carried out deep into the nonlinear viscoelastic (NLVE) regime. By roughening the surface of the rheometer plates, wall slip was effectively suppressed. In the presence of edge fracture and prior to it, steady-state shear banding was not seen as evidenced by velocity profiles that were linear for most of the shear tests. An exception was for an extremely high Weissenberg number Wi--55, for which weak transient banding was observed. For the PS/DEP system studied, the results suggest that in the absence of wall slip, shear banding is not a steady-state phenomenon and weak shear banding is observed only in the transient state and this could possibly correlate with the edge fracture effects. Keywords Melt flow instability Edge fracture Shear banding Nonlinear rheology Wall slip Entangled polymer