Effect of surfactant and temperature on the rheological properties of aqueous solutions of unmodified and hydrophobically modified polyacrylamide

Kopperud, Hilde Molvig; Hansen, Finn Knut; Nyström, Bo

doi:10.1002/macp.1998.021991104

Cited by 15 publications

(40 citation statements)

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“…Other polymers, such as nonionic polyacrylamide (PAM), have very weak interaction with the surfactant SDS. The corresponding hydrophobically modified polymer, HMPAM, could absorb surfactant at hydrophobe sites in a noncooperative way, until it is saturated 17, 55–59…”

Section: Resultsmentioning

confidence: 99%

Epidermal growth factor receptor immunohistochemistry

Hirsch

Dziadziuszko

Thatcher

et al. 2008

Cancer

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Hydrophobically modified polyacrylamide (HMPAM), with a molecular weight of 104 g/mol, was studied using a range of rheological methods and dynamic light scattering (DLS). DLS measurements indicate that the association of the modified polymer begins at low concentration. The modified polymer with high substitution forms transient networks below the critical concentration, but the networks are disrupted by the micelles formed by the polymer itself, and the networks do not contribute to viscosity enhancement. The modified polymers exhibited surface activity, and so they may be regarded as nonionic polymeric surfactants rather than thickeners. On the other hand, HMPAM is shown to interact with the surfactant SDS while PAM is inert to SDS. In the hydrophobic domains, it undergoes a surfactant‐induced association process; in the hydrophobe‐surfactant transition regions, the surfactant binds to the polymer in a noncooperative way and forms a polymer–surfactant complex. Contracted polymer chains begin to extend because of electrostatic repulsion, which can overcome the association at surfactant domains. The conformation of HMPAM polymer chains could be controlled by adding a specific amount of surfactant. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 4348–4360, 2006

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Section: Resultsmentioning

confidence: 99%

Epidermal growth factor receptor immunohistochemistry

Hirsch

Dziadziuszko

Thatcher

et al. 2008

Cancer

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“…It is observed that HPAM would undergo a significant reduction in viscosity and a decrease in the percentage of oil recovery in most of the high‐temperature reservoirs . The viscosity reduction could arise because of the effect of hydrophobic impairment due to an increase in the polymer mobility and the eventual damage of interchain linkages . When reservoir temperatures go above 60 °C, it is most likely that the acrylamide functionality would undergo hydrolysis to form acrylate derivatives or carboxylic acid groups, which have high affinity to salts in the reservoir.…”

Section: Introductionmentioning

confidence: 99%

Improved rheology and high‐temperature stability of hydrolyzed polyacrylamide using graphene oxide nanosheet

Haruna

Pervaiz

et al. 2019

J of Applied Polymer Sci

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Hydrolyzed polyacrylamide (HPAM) is a polymer that extensively used in chemical industry and hydrocarbon extraction and refinery processes, but suffers a common problem of high‐temperature instability. This study improved high‐temperature rheological characteristics of HPAM by using novel graphene oxide (GO) nanosheets. Stable GO dispersions in aqueous HPAM were formulated, and their dynamic and viscoelastic behaviors were studied. The results showed that the addition of GO significantly increased the viscosities and high‐temperature stability of the base polymer fluid, as well as the elastic properties of the dispersion. Spectral data indicated the formation of covalent linkages and electrostatic hydrogen bonding between the GO and the HPAM functional groups, leading to enhanced stability and viscosity that is beneficial for high‐temperature oil recovery. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47582.

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“… 26 It has been reported that surfactant interaction with the polymer becomes strong and rheologically advantageous in case of a hydrophobically modified polymer. 34 Therefore, it is vital to study the extensional rheological properties of the SP systems.…”

Section: Introductionmentioning

confidence: 99%

“…Previous experiments performed on surfactant–HPAM polymer systems concluded that with the increase in surfactant concentration, the shear viscosity of the SP systems shows a monotonic decrease. 34 , 50 − 54 The extensional rheological aspect of SP systems has not been reported in the literature. This study aims to understand the fundamental interactive behavior of most common SP systems (SDBS–HPAM) in the extensional rheological field.…”

Section: Introductionmentioning

confidence: 99%

Extensional Rheological Measurements of Surfactant–Polymer Mixtures

et al. 2020

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Polymer solutions flowing in the porous media during enhanced oil recovery (EOR) processes are subjected to both shear and extensional rheological deformation. However, the previous rheological studies conducted on a surfactant−polymer (SP) system or polymer systems were only shear-based. In this paper, the extensional rheological performance of hydrolyzed polyacrylamide (HPAM) in the presence of an anionic surfactant at various concentrations (0, 0.01, 0.05, 0.1, 0.2, and 0.3%) is studied with deionized water and 1% NaCl. Further, the extensional rheological behavior of HPAM in the presence of NaCl and CaCl 2 is studied at varying ionic strengths (1−10%). A capillary break-up extensional rheometer is used for performing extensional rheological characterization. Results revealed that the extensional resistance of HPAM is enhanced in the presence of a surfactant. Particularly, around the critical micelle concentration value of the surfactant (0.1%), HPAM showed higher extensional resistance. Higher extensional resistance for the SP system is observed with deionized water when compared to 1% NaCl. HPAM showed improved performance at 1% NaCl salinity when compared to the higher concentration of NaCl salinity. However, the presence of even 1% of calcium ions is detrimental to the extensional properties of HPAM.

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Effect of surfactant and temperature on the rheological properties of aqueous solutions of unmodified and hydrophobically modified polyacrylamide

Cited by 15 publications

References 0 publications

Epidermal growth factor receptor immunohistochemistry

Epidermal growth factor receptor immunohistochemistry

Improved rheology and high‐temperature stability of hydrolyzed polyacrylamide using graphene oxide nanosheet

Extensional Rheological Measurements of Surfactant–Polymer Mixtures

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