Dilute Polyacrylamide Solutions under Uniaxial Extensional Flow
The shear and extensional viscosities, dynamic viscosities, and normal forces of a series of polyacrylamide solutions of varying molar mass have been determined in a Boger fluid at varying concentrations. The critical strain rate under extensional flow that can be defined from the departure from Newtonian behavior, εc, was found to be independent of the concentration and varied in the same way as the critical coil−stretch strain rate with the molar mass. A quantitative comparison indicated that εc is a decade lower than the strain rate predicted to characterize the coil−stretch transition. This difference indicates that εc reflects the average deformation of the chains over the range of strain rates.
Chemistry | Polymer Chemistry
Pelletier, E., Viebke, C., Meadows, J., & Williams, P. A. (2003) Dilute Polyacrylamide Solutions under Uniaxial Extensional Flow. Langmuir American Chemical Society, 19(3), 559-565
Digital Commons Citation
Pelletier, E; Viebke, C; Meadows, J; and Williams, Peter A., "Dilute Polyacrylamide Solutions under Uniaxial Extensional Flow" (2003). Centre for Water Soluble Polymers. Paper 7.