Rheology of poly(acrylic) acid

a model study

Yuchen Wang, Richard Pethrick, Nicholas Hudson, Carl Schaschke

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In this study, we examine the rheological characteristics of poly(acrylic acid) (PAA) polymers in aqueous solutions at 20 °C using various techniques. We also develop a model to simulate the rheological behavior of the polymer
solutions, because, in some applications, the polymer is required to be dispersed within a short period of time, during which high-shear mixing is commonly used to achieve the necessary level of homogeneity. The model, which involves consideration of reptation, relaxation of the chains by slippage or loop relaxation, and normal Rouse dynamics, is appropriately adapted to reflect the structural changes of the polymer molecules and then used to identify possible relationships between molecular structure and viscoplastic behavior. The simple theory for flexible polymers is modified to include the possibility of complex formation by association between neighboring polymer molecules. We conclude that, although the model is sensitive to the average molar mass of the polymer, additional and more extensive high-shear-rate data are required to explore fully the validity of the Rouse description. However, the scaling of the viscosity by the addition of an increased friction factor provides a reasonable description of the short-range motions observed.
Original languageEnglish
Pages (from-to)16196–16208
Number of pages13
JournalIndustrial and Engineering Chemistry Research
Volume51
Issue number50
Early online date8 Nov 2012
DOIs
Publication statusPublished - 2012

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carbopol 940
Rheology
Acrylics
Polymers
Acids
Molecules
Molar mass
Shear deformation
Molecular structure
Association reactions
Viscosity
Friction

Keywords

  • rheology
  • poly(acrylic) acid
  • model study

Cite this

Wang, Y., Pethrick, R., Hudson, N., & Schaschke, C. (2012). Rheology of poly(acrylic) acid: a model study. Industrial and Engineering Chemistry Research, 51(50), 16196–16208. https://doi.org/10.1021/ie302313a
Wang, Yuchen ; Pethrick, Richard ; Hudson, Nicholas ; Schaschke, Carl. / Rheology of poly(acrylic) acid : a model study. In: Industrial and Engineering Chemistry Research. 2012 ; Vol. 51, No. 50. pp. 16196–16208.
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Wang, Y, Pethrick, R, Hudson, N & Schaschke, C 2012, 'Rheology of poly(acrylic) acid: a model study', Industrial and Engineering Chemistry Research, vol. 51, no. 50, pp. 16196–16208. https://doi.org/10.1021/ie302313a

Rheology of poly(acrylic) acid : a model study. / Wang, Yuchen; Pethrick, Richard; Hudson, Nicholas; Schaschke, Carl.

In: Industrial and Engineering Chemistry Research, Vol. 51, No. 50, 2012, p. 16196–16208.

Research output: Contribution to journalArticle

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T1 - Rheology of poly(acrylic) acid

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AU - Wang, Yuchen

AU - Pethrick, Richard

AU - Hudson, Nicholas

AU - Schaschke, Carl

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AB - In this study, we examine the rheological characteristics of poly(acrylic acid) (PAA) polymers in aqueous solutions at 20 °C using various techniques. We also develop a model to simulate the rheological behavior of the polymer solutions, because, in some applications, the polymer is required to be dispersed within a short period of time, during which high-shear mixing is commonly used to achieve the necessary level of homogeneity. The model, which involves consideration of reptation, relaxation of the chains by slippage or loop relaxation, and normal Rouse dynamics, is appropriately adapted to reflect the structural changes of the polymer molecules and then used to identify possible relationships between molecular structure and viscoplastic behavior. The simple theory for flexible polymers is modified to include the possibility of complex formation by association between neighboring polymer molecules. We conclude that, although the model is sensitive to the average molar mass of the polymer, additional and more extensive high-shear-rate data are required to explore fully the validity of the Rouse description. However, the scaling of the viscosity by the addition of an increased friction factor provides a reasonable description of the short-range motions observed.

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