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- W215962809 abstract "Synthetic polymers have been carefully prepared as models of known composition and measurable molecular weight, molecular weight distribution, ionic charge density, and branching. Major efforts have been centered on random copolymers of acrylamide with sodium acrylate and on graft copolymers of acrylamide with well characterized polysaccharides such as dextran and amylose. Additionally, random copolymers of poly(acrylamide-co-sodium acrylate) have been prepared by controlled hydrolysis of polyacrylamide homopolymer. The synthesized laboratory samples as well as selected commercial samples have been extensively characterized. Solution rheological studies have been initiated to investigate the interrelationships between solution behavior and hydrodynamic volume. For example, relationships between molecular structure and solution properties under more ideal conditions have been rather rigorously developed in theory. Intrinsic viscosities of synthesized model polymers and representative commercial samples have been obtained utilizing the Huggins equation, Kraemer equation, and Schulz--Blaschke equation. Effects of mixing conditions and aging effects as well as solvent, electrolyte, pH, and temperature dependence on intrinsic viscosity have been measured. Polymer solution degradation studies during the first year have been directed towarddeveloping quantitative assessments of fluid shear stresses and their effects on primary and secondary bond dissociations during flow of polymer containing fluids through porous media. Laboratory evidence seems tomore » indicate that apparent ''shear degradation'' observed for a number of polymers in aqueous solutions is largely a result of secondary bond dissociation rather than primary bond cleavage. This phenomenon is reversible and highly time and concentration dependent. Mobility control loss, during polymer flooding, may be largely due to adsorption, flocculation, and excluded volume effects.« less" @default.
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- W215962809 date "1978-12-01" @default.
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- W215962809 title "Improved polymers for enhanced oil recovery: synthesis and rheology. First annual report for the period October 1977--September 1978" @default.
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