scholarly journals An examination of the shear-thickening behavior of high molecular weight polymers dissolved in low-viscosity Newtonian solvents

2002 ◽  
Vol 85 (8) ◽  
pp. 1714-1735 ◽  
Author(s):  
B. J. Edwards ◽  
D. J. Keffer ◽  
C. W. Reneau
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Shear Thickening ◽  
Low Viscosity ◽  
High Molecular Weight Polymers ◽  
Thickening Behavior

Shear-thickening behavior of high molecular weight poly(ethylene oxide) solutions

2011 ◽  
Vol 51 (1) ◽  
pp. 13-20 ◽  
Author(s):  
Daniela Rivero ◽  
Laura M. Gouveia ◽  
Alejandro J. Müller ◽  
A. Eduardo Sáez
Keyword(s):  
Molecular Weight ◽  
Ethylene Oxide ◽  
High Molecular Weight ◽  
Shear Thickening ◽  
Poly Ethylene Oxide ◽  
Thickening Behavior ◽  
Poly Ethylene ◽  
High Molecular Weight Poly

scholarly journals An Experimental Study on Hydrodynamic Retention of Low and High Molecular Weight Sulfonated Polyacrylamide Polymer

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1453 ◽  
Author(s):  
Sameer Al-Hajri ◽  
Syed Mahmood ◽  
Ahmed Abdulrahman ◽  
Hesham Abdulelah ◽  
Saeed Akbari ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Oil Recovery ◽  
Shear Thickening ◽  
Permeability Reduction ◽  
High Permeability ◽  
Molecular Weight Polymer ◽  
Thickening Behavior ◽  
Sulfonated Polyacrylamide ◽  
Polymer Retention

Polymers are often added with water as a viscosifier to improve oil recovery from hydrocarbon reservoirs. Polymer might be lost wholly or partially from the injected polymer solution by adsorption on the grain surfaces, mechanical entrapment in pores, and hydrodynamic retention in stagnant zones. Therefore, having a clear picture of polymer losses (and retention) is very important for designing a technically and economically successful polymer flood project. The polymer adsorption and mechanical entrapment are discussed more in depth in the literature, though the effect of hydrodynamic retention can be just as significant. This research investigates the effect of the hydrodynamic retention for low and high molecular weight (AN 113 VLM and AN 113 VHM) sulfonated polyacrylamide polymer. Two high permeability Bentheimer core plugs from outcrops were used to perform polymer corefloods. Polymer retention was first determined by injecting 1 cm3/min, followed by polymer core floods at 3, 5, and 8 cm3/min to determine the hydrodynamic retention (incremental retention). A higher molecular weight polymer (AN 113 VHM) showed higher polymer retention. In contrast, hydrodynamic retention for lower molecular weight (AN 113 VLM) was significantly higher than that of the higher molecular weight polymer. Other important observations were the reversibility of the hydrodynamic retention, no permanent permeability reduction, the shear thinning behavior in a rheometer, and shear thickening behavior in core floods.

Determination of Peroxides in Synthetic Rubbers

1945 ◽  
Vol 18 (4) ◽  
pp. 874-876
Author(s):  
Richard F. Robey ◽  
Herbert K. Wiese
Keyword(s):  
Molecular Weight ◽  
Natural Rubber ◽  
Quantitative Determination ◽  
High Molecular Weight ◽  
Active Oxygen ◽  
Lower Molecular Weight ◽  
Synthetic Rubber ◽  
High Molecular Weight Polymers ◽  
Methanol Solutions

Abstract Peroxides are found in synthetic rubbers either as the result of attack by oxygen, usually from the air, or as a residue from polymerization operations employing peroxide catalysts. Because of possible detrimental effects of active oxygen on the properties of the rubber, a method of quantitative determination is needed. The concentration of peroxides in substances of lower molecular weight may be determined with ferrous thiocyanate reagent, either titrimetrically as recommended by Yule and Wilson or colorimetrically as by Young, Vogt, and Nieuwland. Unfortunately, many highly polymeric substances are not soluble in the acetone and methanol solutions employed in these procedures. This is also the case with hydrocarbon monomers, such as butadiene, containing appreciable concentrations of soluble high molecular weight polymers. Bolland, Sundralingam, Sutton and Tristram recommended benzene as a solvent for natural rubber samples and the reagent made up in methanol. However, most synthetic rubbers are not readily soluble even in this combination. The following procedure employs the ferrous thiocyanate reagent in combination with a solvent capable of maintaining considerable concentrations of synthetic rubber in solution. The solvent comprises essentially 20 per cent ethanol in chloroform.

The Influence of Side-Chain Modification on Shear Thickening in Solutions of Some High Molecular Weight Copolymers

1998 ◽  
pp. 423-424
Author(s):  
J. Ferguson ◽  
N. E. Hudson ◽  
J. R. Ebdon ◽  
N. J. Flint ◽  
D. J. Hourston ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Shear Thickening ◽  
Side Chain
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