Shear and extensional viscosity characteristics of a series of hydrophobically associating polyelectrolytes

Kennedy, John C.; Meadows, J.; Williams, Peter A.

doi:10.1039/ft9959100911

Cited by 26 publications

(27 citation statements)

References 13 publications

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“…This value was higher than the HPAM (Figure ). The exhibition of maxima by associative polymer followed by thinning had been reported in the literature . Maxima exhibition is an indication of the higher elasticity .…”

Section: Resultssupporting

confidence: 55%

Capillary breakup extensional rheometry of associative and hydrolyzed polyacrylamide polymers for oil recovery applications

Azad

Dalsania

2018

J of Applied Polymer Sci

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High molecular weight polymers used for heavy oil recovery exhibit viscoelasticity that can influence the oil recovery during chemical enhanced oil recovery. Different polymers having similar molecular weight and shear rheology may have different elongation flow behavior depending on their extensional properties. Displacing slugs are more likely to stretch than shear in tortuous porous media. Therefore, it is critical to seek an analytical tool that can characterize extensional parameters to improve polymer selection criteria. This article focuses on the extensional characterization of two polymers (hydrolyzed polyacrylamide and associative polymer) having identical shear behavior using capillary breakup extensional rheometer to explain their different porous media behavior. Maximum extensional viscosity at the critical Deborah number and Deborah number in porous media classified the associative polymer as the one having high elastic-limit. Extensional characterization results were complemented by significantly higher pressure drop, marginally increased oil recovery of associative polymer in porous media.

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Section: Resultssupporting

confidence: 55%

Capillary breakup extensional rheometry of associative and hydrolyzed polyacrylamide polymers for oil recovery applications

Azad

Dalsania

2018

J of Applied Polymer Sci

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“…[30][31][32] Furthermore, the viscosity dependence with the shear rate or stress, the thixotropy, and the viscoelastic behavior of polymeric materials are related to the microstructure 33 and in the case of acrylic thickeners, to the mechanism of thickening aqueous media. [34][35][36] A family of anionic copolymers using the optimal values of the factors investigated was synthesized using the three levels of MBA mentioned in Table I.…”

Section: Rheological Characterization Of Diluted Water Dispersionmentioning

confidence: 99%

Preparation of highly concentrated inverse emulsions of acrylamide‐based anionic copolymers as efficient water rheological modifiers

Barajas

Carrillo²,

Alvarado

2016

J of Applied Polymer Sci

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Highly concentrated inverse anionic polymeric emulsions (with a solid content of up to 63 wt %) were prepared using a two-step methodology: (i) First, acrylamide, acrylic acid, and its ammonium salts crosslinked copolymers were obtained by inverse emulsion polymerization, (ii) The water/volatile oil mixture was then separated from the heterogeneous system by vacuum distillation. To maintain sufficient stability during the reaction and distillation processes, a ternary surfactant mixture was used. A surface response methodology was employed to obtain the optimal values of the factors involved in both process and product specifications, and to maximize the high performance of these inverse anionic polymer emulsions. This yielded a product containing up to 63.2 wt % solids capable of achieving Brookfield viscosities as high as 40.3 PaÁs, using an aliquote of these concentrated inverse polymer emulsions (1.8 wt % in deionized water). Rheological characterization (oscillatory and rotational measurements) was carried out to evaluate the behavior of the diluted inverse anionic polymer emulsion in water thickening. The methodology developed can be used to formulate a wide range of viscoelastic (G 00 /G 0 ) water-based products from anionic water soluble polymers.

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“…Recently, hydrophobically associating water-soluble polymers (HAWSP) among polymeric amphiphiles have drawn considerable attention because of their unique rheological properties (Tanaka et al 1990;Kennedy et al 1995) and their complexation ability with low and high molecular mass compounds (Nishikawa et al 1994(Nishikawa et al , 1996. Although pure HPC shows a viscometric behavior that follows the equation of Huggins (Huggins 1942), a modified HPC with a long alkyl chain epoxide gives unusual solution properties (Landoll 1982).…”

Section: Introductionmentioning

confidence: 99%

Self-Assembly of Pulp Derivatives as Amphiphilic Compounds: Verification of Molecular Association and Complexation with Low and High Molecular Mass Compounds

Uraki¹,

Hanzaki²,

Hashida³

et al. 2000

Holzforschung

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Acetic acid pulps (AAPs) have been converted to amphiphiles by hydroxypropylation. The resulting hydroxypropyl derivatives (HP-AAPs) formed self-aggregates in water. The interaction of HP-AAP molecules was investigated by a viscometric method. The reduced viscosity (h sp /c) of HP-AAP in both water and chloroform was increased remarkably above a concentration of 0.1%. This implies that HP-AAP molecules strongly interact with each other, caused by the hydrophobic interaction of residual lignins in water and by hydrogen bonding of polysaccharides in chloroform. The self-aggregates adsorb water-soluble fluorescent agents. The highest adsorption capacity was observed at the lowest pH among three pH conditions investigated. They also solubilized sparingly water-soluble fluorescent agents in water in larger amounts than did sodium dodecyl sulfate when used as a surfactant. These results suggest that the selfaggregates of HP-AAP adsorb low molecular mass compounds as inclusion compounds. To clarify the interaction of HP-AAP with biopolymers as high molecular mass compounds, the change in the activity of papain, a protease, in phosphate buffer (pH 6.2) was examined in the presence and absence of HP-AAP. HP-AAP acted as an inhibitor of papain at the initial stage of mixing. After mixing for 24 hours, however, the papain activity was revived and preserved for 6 days. In contrast, the papain activity vanished in the absence of HP-AAP after 24 hours because of autolysis. Therefore, HP-AAP protects papain against autolysis, resulting from tight complexation with the biopolymer. KeywordsAcetic acid pulp Amphiphile Complexation with biopolymer Hydroxypropylation Inclusion compound Self-assembly Brought to you by |

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Shear and extensional viscosity characteristics of a series of hydrophobically associating polyelectrolytes

Cited by 26 publications

References 13 publications

Capillary breakup extensional rheometry of associative and hydrolyzed polyacrylamide polymers for oil recovery applications

Capillary breakup extensional rheometry of associative and hydrolyzed polyacrylamide polymers for oil recovery applications

Preparation of highly concentrated inverse emulsions of acrylamide‐based anionic copolymers as efficient water rheological modifiers

Self-Assembly of Pulp Derivatives as Amphiphilic Compounds: Verification of Molecular Association and Complexation with Low and High Molecular Mass Compounds

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