Abstract
Assuming the formation of doublets in the flow according to a mass action law, the shear rate and the concentration dependence of the extinction angle, of the birefringence, and of the average coil expansion are calculated for dilute solutions of flexible macromolecules. It is shown that this reversible association process has a strong influence on the measurable parameters in a flow birefringence experiment.
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Abbreviations
- c :
-
concentration (g/cm3)
- h 2 :
-
mean square end-to-end distance at shear rate\(\dot \gamma \)
- h 20 :
-
mean-square end-to-end distance at zero-shear rate
- n :
-
refractive index of the solution (not very different from the solvent for a very dilute solution)
- E :
-
mean coil expansion
- K 0,K :
-
constant of the mass action law
- M :
-
molecular weight
- R G :
-
gas constant
- T :
-
absolute temperature
- α 1 – α2 :
-
optical anisotropy of the segment
- β 0 :
-
Deborah number:\(\beta _0 = {\rm M} [\eta ]_0 \eta _s \dot \gamma /R_G T\)
- β :
-
Deborah number:\(\beta = {\rm M} [\eta ] \eta _s \dot \gamma /R_G T\)
- \(\dot \gamma \) :
-
shear rate
- ε 0,ε :
-
reduced concentration
- η s :
-
viscosity of the solvent
- [η] 0 :
-
intrinsic viscosity at zero-shear rate
- [η]:
-
intrinsic viscosity at shear rate\(\dot \gamma \)
- χ :
-
extinction angle
- N a :
-
Avodagro's number
- Δ n :
-
magnitude of the birefringence
References
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Dupuis, D., Wolff, C. Influence of the formation of associations of macromolecules on the rheo-optical properties of their dilute solutions. I. Theory. Rheol Acta 26, 358–366 (1987). https://doi.org/10.1007/BF01332254
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DOI: https://doi.org/10.1007/BF01332254