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- What are the main factors affecting the viscosity of polyacrylamide?
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What is the factors effect anionic polyacrylamide viscosity
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Anionic polyacrylamide solution viscosity reflects mainly due to internal friction between molecules of the liquid flow generated by the movement or relative. Friction within the structure of the polymer, the nature of the solvent, concentration of the solution and the temperature and pressure and other factors, the greater its value, indicating that the greater the viscosity of the solution.
1.The effect of temperature on the viscosity of anionic polyacrylamide
Temperature molecular random thermal motion reflects the intensity of molecular motion must overcome the interaction force between molecules, and the interaction between molecules, such as intermolecular hydrogen bonds, internal friction, diffusion, molecular chain orientation, entanglement, etc., a direct impact on the size of the viscosity, the viscosity of the polymer solution it will change with temperature. The effect of temperature changes on the viscosity of the polymer solution was remarkable. Anionic polyacrylamide solution viscosity with increasing temperature decreases, the reason is the dispersed particles of polymer solution is entangled with each other to form a network structure of the polymer, when higher the temperature, the more easy to destroy the network structure, so its viscosity decline.
2.Hydrolysis time on the viscosity of anionic polyacrylamide
Anionic polyacrylamide solution viscosity with changes hydrolysis time, hydrolysis time is short, a small viscosity, which may be due to polymer had a chance to form a network structure due; hydrolysis time is too long, decrease in viscosity, which is an anionic polymer release induced by acrylamide structure in solution. Partially hydrolyzed anionic polyacrylamide dissolved in water to dissociate into negatively charged macromolecules, anionic repulsion, and electrostatic repulsion between molecules of different chain links on the same molecule leads between molecules in solution and that it is stretched between the molecule to winding, which is partially hydrolyzed anionic polyacrylamide solution viscosity can make it obvious reason for the increase.
3.The impact of salinity on the viscosity of anionic polyacrylamide
Anionic polyacrylamide molecular chain cationic group an anionic group with respect to a larger number, the net charge more polar, and H20 is a polar molecule, according to the similarity dissolves, is preferably a water-soluble polymer, the characteristics high viscosity; mineral content increases, the positive electrostatic charge to form an ion atmosphere is surrounded by some anion, which combine with the surrounding positive electrostatic charge, the polarity of the polymer solution decreases, the viscosity decreases; mineral concentrations continued to increase , the positive and negative ions groups form intramolecular or intermolecular association of hydrogen bonds (resulting in decreased solubility of the polymer in water), while adding salt ions by masking the positive and negative charge, being dismantled, and the association between negative key is the salt formed is destroyed (leading to an increase in solubility of the polymer in water), the role of these two competing, so that the polymer solution at higher salt concentrations (> 0.06 mol / L) is kept small viscosity .
4.On the molecular weight anionic polyacrylamide viscosity
Anionic polyacrylamide solution viscosity varies with the molecular weight of the polymer increases, which is due to the viscosity of the polymer solution when the interaction between molecules by molecular motion. When the polymer molecular weight of about 106, polymer coils begin to penetrate each other enough to affect light scattering. When the content is slightly higher mechanical entanglement enough to affect viscosity. Content is relatively low, the polymer solution can be regarded as a network structure, mechanical entanglement and hydrogen bonding between the chains together form a network node. At higher levels, the solution contains many chain - link contacts to make the polymer solution was gelled. Thus, the greater the relative molecular weight polymer, the more easy to form intermolecular chain entanglement, the greater the viscosity of the solution.
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