Rheology polymer solutions

Electrolyte Effect on Polymer Solution Rheology. As salt concentration in an aqueous poly(1-amidoethylene) solution increases, the resulting brine becomes a more Theta-solvent for the polymer and the polymer coil compresses(47) This effect is particularly pronounced for partially hydrolyzed poly(l-amidoethylene). The... 

Bird, R. B., Dotson, P. J., and Johnson, N. L., Polymer solution rheology based on a finitely extensible bead-spring chain model, J. Non-Newtonian Fluid Mech., 7, 213-235 (1980). 

Complex fluids Polymer solutions Rheology Suspensions... 

Polyelectrolyte and non-polyelectrolyte acrylamide random copolymers and graft copolymers of dextran with acrylamide were synthesized to evaluate the effects of polymer composition and structure on viscosity modification and solution behavior in water and brine. Polymer solution rheological behavior and precipitation properties were measured. 

Nouri, H. "Polymer Solution Rheology and Displacement Processes, PhD thesis, U. of Oklahoma, Norman (1971). 

Nouri, H.H. and Root, P.J. 1971. A Study of Polymer Solution Rheology, Flow Behavior, and Pil Displacement Processes. Paper SPE 3523 presented at the SPE Annual Meeting, New Prieans, 3-6 Pctober. DPI 10.2118/3523-MS. 

The importance of some of these process issues relating to polymer solution rheology and solidification can be seen in the dry spinning of acrylics (Cox, 2005). An acrylic fiber is one in which the fiber-forming substance is any long chain synthetic polymer composed of at least 85% by weight of acrylonitrile (AN) units (-CH2-CH(CN)-). Acrylic fibers are made from the polymer polyacrylonitrile (PAN), a synthetic, semicrystalline, organic polymer... 

Rheology deals with the deformation and flow of any material under the influence of an applied stress. In practical apphcations, it is related with flow, transport, and handling any simple and complex fluids [1], It deals with a variety of materials from elastic Hookean solids to viscous Newtonian liquid. In general, rheology is concerned with the deformation of solid materials including metals, plastics, and mbbers, and hquids such as polymer melts, slurries, and polymer solutions. 

Prediction of Rheological Behaviour of Semi-Dilute Polymer Solutions at Finite Rates of Deformation... 

RJ Meyer, L Cohen. Rheology of natural and synthetic hydrophilic polymer solutions and related to suspending ability. J Soc Cosmet Chem 10 1-11, 1959. 

Early applications of polymers to extraction processes were based on the ability of polymers to alter solution rheology. Pye(3l) and Sandiford(32) showed that fluid mobility could be effectively reduced by the addition of small amounts of polymer to the solvent. 

Similarly, Thompson(33) showed that the addition of trace quantities of high molecular weight polymer to solvent reduced friction loss during turbulent flow of the solution. As knowledge of the characteristics needed to do more than change solution rheology grew, complex polymers were prepared and applied. 

Chang, H.D., Darby, R. "Effect of Shear Degradation on the Rheological Properties of Dilute Drag Reducing Polymer Solutions," J. Rheol.. 1983, 27(1), 77-88. 

Hydraulic fracturing fluids are solutions of high-molecular-weight polymers whose rheological behavior is non-Newtonian. To describe the flow behavior of these fluids, it is customary to characterize the fluid by the Power Law parameters of Consistency Index (K) and Behavior Index (n). These parameters are obtained experimentally by subjecting the fluid to a series of different shear rates (y) and measuring the resultant shear stresses (t). The slope and Intercept of a log shear rate vs log shear stress plot yield the Behavior Index (n) and Consistency Index (Kv), respectively. Consistency Indices are corrected for the coaxial cylinder viscometers by ... 

The above model assumes that both components are dynamically symmetric, that they have same viscosities and densities, and that the deformations of the phase matrix is much slower than the internal rheological time [164], However, for a large class of systems, such as polymer solutions, colloidal suspension, and so on, these assumptions are not valid. To describe the phase separation in dynamically asymmetric mixtures, the model should treat the motion of each component separately ( two-fluid models [98]). Let Vi (r, t) and v2(r, t) be the velocities of components 1 and 2, respectively. Then, the basic equations for a viscoelastic model are [164—166]... 

There are three situations that appear to be relevant here. First, we may think of a solid polymer formed from the melt second, the much more compliant elastomers that initially come to mind when we think of rubber elasticity and third, polymer gels formed in polymer solutions. In each case the details of the physical chemistry of the macromolecules is crucial to the understanding of the structure that is formed. In this section we will concentrate on organic macromolecules because the rheology of these molecular systems is often the reason for their use. 

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