Universal Concentration Scaling on Rheometric Properties of Polydisperse and High Molecular Weight Polyacrylamide Aqueous Solutions

Yuan-Qi Fan; Alfredo Lanzaro; Xue-Feng Yuan

doi:10.1007/s10118-022-2757-6

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Universal Concentration Scaling on Rheometric Properties of Polydisperse and High Molecular Weight Polyacrylamide Aqueous Solutions

RESEARCH ARTICLE | Updated：2022-10-25

- Universal Concentration Scaling on Rheometric Properties of Polydisperse and High Molecular Weight Polyacrylamide Aqueous Solutions
- Chinese Journal of Polymer Science Vol. 40, Issue 11, Pages: 1432-1440(2022)
- Affiliations：
  
  Institute for Systems Rheology, Guangzhou University, Higher Education Mega-Center, Guangzhou 510006, China
- Author bio：
  
  xuefeng.yuan@gzhu.edu.cn
- Funds：
- DOI：10.1007/s10118-022-2757-6
  CLC：
- Received：21 February 2022，
  
  Revised：2022-3-27，
  
  Accepted：15 April 2022，
  
  Online First：20 July 2022，
  
  Published：01 November 2022
- Accepted：
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Fan, Y. Q.; Lanzaro, A.; Yuan, X.-F. Universal concentration scaling on rheometric properties of polydisperse and high molecular weight polyacrylamide aqueous solutions. Chinese J. Polym. Sci. 2022, 40, 1432–1440

Yuan-Qi Fan, Alfredo Lanzaro, Xue-Feng Yuan. Universal Concentration Scaling on Rheometric Properties of Polydisperse and High Molecular Weight Polyacrylamide Aqueous Solutions[J]. Chinese Journal of Polymer Science, 2022, 40(11): 1432-1440.
Fan, Y. Q.; Lanzaro, A.; Yuan, X.-F. Universal concentration scaling on rheometric properties of polydisperse and high molecular weight polyacrylamide aqueous solutions. Chinese J. Polym. Sci. 2022, 40, 1432–1440 DOI： 10.1007/s10118-022-2757-6.

Yuan-Qi Fan, Alfredo Lanzaro, Xue-Feng Yuan. Universal Concentration Scaling on Rheometric Properties of Polydisperse and High Molecular Weight Polyacrylamide Aqueous Solutions[J]. Chinese Journal of Polymer Science, 2022, 40(11): 1432-1440. DOI： 10.1007/s10118-022-2757-6.

摘要

This study shows a well-defined concentration scaling of the rheometric properties of extremely polydisperse polymer solutions across semi-dilute entangled concentration range. The time-concentration superposition principle is validated and extended in the data analysis of the terminal dynamic regime. The concentration scaling differences with other monodisperse polymer solutions are identified.

Abstract

A great progress has been made over the last decades in studying concentration scaling on rheometric properties of monodisperse polymer solutions. However

the effects of polydisperse polymer solutions on such a concentration scaling remain elusive. In this work

rheometric properties of industrially relevant polydisperse and high molecular weight polyacrylamide (PAAm) aqueous solution have been studied. The results show a concentration scaling of the characteristic relaxation time

the plateau modulus and the zero-shear viscosity across a concentration range from 10c* to 250c*. The time-concentration superposition principle is validated and extended in the data analysis of the terminal dynamic regime. The concentration scaling exponent of their shifting factors is significantly smaller than the results of monodisperse polymer solutions in good and

solvents reported in the literature. The steady shear viscosity and shear stress of 18M PAAm aqueous solutions with relatively lower concentration (≤35c*) could also be superimposed into a master curve with the shear-thinning exponent of 0.73±0.03 and 0.27±0.03

respectively

over a wide range of shear rates in about six orders of magnitudes. However

for 18M PAAm aqueous solutions with higher concentration (≥48c*) in an intermediate shear thinning regime

the scaling exponent shows a pronounced concentration dependence. The shear thinning exponent of steady shear viscosity varies from 0.73 to 0.57 as concentration is increased

and then increases from 0.57 to 0.90 from sufficiently high shear rate. Further increasing shear rate

the shear-thinning exponent of 18M PAAm aqueous solutions at all concentrations converges to the lower bounded value observed in the relatively less concentrated (≤35c*) 18M PAAm aqueous solutions

i.e.

0.73±0.02 for shear viscosity and 0.27±0.02 for steady shear stress

respectively. It reveals that the concentration effects of polydisperse polymer solutions could be greatly reduced by the dynamic "molecular individualism” in strong shear flow.

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