Hydrodynamic interaction and the dynamic intrinsic viscosity of a flexible polymer

1978 ◽  
Vol 68 (4) ◽  
pp. 1890-1895 ◽  
Author(s):  
Mordechai Bixon ◽  
Robert Zwanzig
Keyword(s):  
Intrinsic Viscosity ◽  
Hydrodynamic Interaction ◽  
Flexible Polymer

Intrinsic flow birefringence of stiff chains

1979 ◽  
Vol 44 (5) ◽  
pp. 1581-1589 ◽  
Author(s):  
Ivan Fortelný
Keyword(s):  
Intrinsic Viscosity ◽  
Hydrodynamic Interaction ◽  
Flow Birefringence ◽  
Intrinsic Birefringence

Using the Svetlov theory, it is shown that the ratio of intrinsic flow birefringence to intrinsic viscosity is independent of the magnitude of the hydrodynamic interaction, in the case where the latter is consistently pre-averaged. The intrinsic birefringence has been calculated on Tagami's model for stiff chains, and the results are compared with earlier theories.

scholarly journals Viscosity Measurements of Dilute Poly(2-ethyl-2-oxazoline) Aqueous Solutions Near Theta Temperature Analyzed within the Joint Rouse-Zimm Model

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Jana Tóthová ◽  
Katarína Paulovičová ◽  
Vladimír Lisý
Keyword(s):  
Experimental Data ◽  
Steady State ◽  
Aqueous Solutions ◽  
Intrinsic Viscosity ◽  
Shear Viscosity ◽  
Hydrodynamic Interaction ◽  
Arrhenius Equation ◽  
Polymer Dynamics ◽  
Usual Assumption ◽  
Theta Temperature

The steady-state shear viscosity of low-concentrated Poly(2-ethyl-2-oxazoline) (PEOX) aqueous solutions is measured near the presumed theta temperature using the falling ball viscometry technique. The experimental data are analyzed within the model that joins the Rouse and Zimm bead-spring theories of the polymer dynamics at the theta condition, which means that the polymer coils are considered to be partially permeable to the solvent. The polymer characteristics thus depend on the draining parameterhthat is related to the strength of the hydrodynamic interaction between the polymer segments. The Huggins coefficient was found to be 0.418 at the temperature 20°C, as predicted by the theory. This value corresponds toh= 2.92, contrary to the usual assumption of the infiniteh. This result indicates that the theta temperature for the PEOX water solutions is 20°C rather than 25°C in the previous studies. The experimental intrinsic viscosity is well described coming from the Arrhenius equation for the shear viscosity.

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