Ultra-High-Molecular-Weight, Narrow-Polydispersity ...
Obtain the high-molecular weight polyacrylamide, molecular weight is greater than 1,700 ten thousand, especially adopt hydrolytic reagent of the present invention and employing ternary...
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Synthesis and Characterization of Different Molecular Weights ...
Abstract: Polyacrylamides of varying molecular weights (very low, low, medium, high and very high) were synthesized using free radical polymerization and characterized by Infra Red (IR) spectroscopy, viscosity measurements, glass transition temperature (Tg) measurement and thermal gravimetric analysis (TGA).
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Characterization of High Molecular Weight Polyacrylamide ...
high molecular weight PAM standard was characterized by AF4-MALS for molecular weight, size and branching. The weight average molecular weight of the polymer was measured as 7.6 MDa with a weight average radius of gyration of 154 nm. The conformation plot suggested high order of branching in the polymer structure.
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US4617359A - High molecular weight polyacrylamide synthesis ...
This ultra-high molecular weight polyacrylamide has excellent properties as an injection water viscosifier for EOR applications. Even though polyacrylamide synthesized by utilizing the process of this invention is sensitive to metal salts its viscosity in aqueous ...
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High molecular weight polyacrylamide nanoparticles prepared ...
The above reported data show that temperature affects the stability of commercial polyacrylamide solutions in two different ways: hydrolysis process of amide groups,which is pH and temperature dependent. molecular weight degradation process which is strngly dependent on the presence of both oxygen and residual impurities. The first process that increases the anionic character of polymers is ...
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Rheology and mechanical degradation of high-molecular-weight ...
Ultra-high-molecular-weight, water-soluble polyelectrolytes are commonly employed as flocculants for solid-liquid separation via colloidal destabilization, enabling the rapid and efficient removal of particulate matter from wastewater streams. A drive toward more sustainable and less polluting indus …
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The Measurement of the Molecular Weight (MW) and Molecular W ...
The invention relates to a preparation method of instant ultra-high molecular weight polyacrylamide dry powder. The method comprises the following steps of: taking acrylic amide AM as a monomer, adopting a low-temperature composite initiation system taking NTP ...
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Synthesis of High Molecular Weight Water-Soluble Polymers as ...
However, the synthesis of high molecular weight water-soluble polymers via RAFT aqueous solution polymerization leads to extremely viscous reaction mixtures. For example, gel formation was reported by Destarac and co-workers when preparing polyacrylamide ...
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Very High Molecular Weight Cationic Polyacrylamide - 35% Mol ...
Very high molecular weight cationic polyacrylamide with a mole charge of 35%. Accepta 4222 is a versatile polymer that is particularly useful for wastewater treatment applications including belt filter, centrifuge and screw press de watering, water clarification, filtration, thickening or use in a Dissolved Air Flotation (DAF) plant...
Get PriceSYNTHESIS AND CHARACTERIZATION OF POLYACRYLAMIDE WITH CONTRO ...
Z. Abdollahi, V.G. Gomes 2 Solution polymerization, however, received scant attention for synthesising high molecular weight polyacrylamide despite its advantages and wide use in industry. ...
Get PriceMolecular weight and degree of hydrolysis of anionic polyacr ...
Molecular weight of anionic polyacrylamide: As an industrial sewage treatment agent, the molecular weight is between 6 million and 18 million. The misunderstanding we need to understand: It is not that the higher the molecular weight, the better the effect of treating sewage.
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CN103709288A - Ultra-high molecular weight anionic polyacryl ...
The invention provides an ultra-high molecular weight anionic polyacrylamide. The ultra-high molecular weight anionic polyacrylamide is composed of ingredients with the following concentrations, 20%-25% of polyacrylamide, 2.0-2.5 g/L of TB-2000, 0.01-0.013 g/L
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Mechanism of Polyacrylamide Hydrogel Instability on High-Tem ...
At higher temperature, the chain reaction was accelerated, and the rupture rates of the polymer chain were enhanced. ... Muller G. Thermal stability of high-molecular-weight polyacrylamide aqueous solutions. Polym. Bull. 1981, 5, 31–37. 10.1007/bf00255084. [] [] ...
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Development of Synthesis and Application of High Molecular W ...
Abstract: Static mixers have been widely used to dilute high viscosity, high-molecular-weight polymer mother liquor for polymer flooding, in which the mixing performance plays a critical role. In this work, a novel mixing configuration, named as Helixes static mixer, was proposed to reduce high viscosity degradation rate of polyacrylamide
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Degradation of high molecular weight polyacrylamide by alkal ...
Abstract High molecular weight polyacrylamide (PAM) nanoparticle dispersions are products with wide application possibilities, the most important of which is in petroleum in-
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CN102964519A - Preparation method of ultra-high molecular we ...
The invention discloses a preparation method of ultra-high molecular weight amphoteric polyacrylamide. The preparation method comprises the following steps of: performing a ternary copolymerization reaction initiated by a cyclic azo amidine initiator VA-044 among ...
Get PriceWhich polyacrylamide has the lowest stability?
On the other hand, very low molecular weight polyacrylamide displayed the lowest stability. The increase in molecular weight caused a decrease of weight loss %. The residue at 600oC being 11.67%, 14.68%, 17.83%, 19.45%, and 22.55% for the cases of very low, low, medium, high and very high molecular weight polyacrylamides respectively.
How are high molecular weight polyacrylamide nanoparticles prepared?
High molecular weight polyacrylamide nanoparticles were prepared by inverse-emulsion polymerization of aqueous acrylamide solution in xylene as a continuous phase under various conditions in the presence of a mixture of non-ionic emulsifiers (Tween 85 and Span 80).
What is low molecular weight polyacrylamide?
Low molecular weight polyacrylamide was synthesized using hydrogen peroxide as initiator and the reaction was carried out at high temperature (90oC) to give polyacrylamide free of contaminates detected by FTIR spectroscopy. The product was a low viscosity white colour liquid.
How are polyacrylamides synthesized?
Abstract: Polyacrylamides of varying molecular weights (very low, low, medium, high and very high) were synthesized using free radical polymerization and characterized by Infra Red (IR) spectroscopy, viscosity measurements, glass transition temperature (Tg) measurement and thermal gravimetric analysis (TGA).
What are the initiators for polyacrylamide synthesis?
Thioglycolic acid and hydrogen peroxide were used as initiators to synthesis very low and low molecular weight polyacrylamides respectively. Molecular weights (medium, high and very high) polyacrylamides were synthesized using potassium persulfate and N,N,N',N'- tetramethylethylenediaminesystem as initiators.
Does molecular weight affect thermal stability of polyacrylamide?
The very high molecular weight polyacrylamide displayed the highest stability in the series, indicating the importance of the molecular weight for thermal stability. On the other hand, very low molecular weight polyacrylamide displayed the lowest stability. The increase in molecular weight caused a decrease of weight loss %.
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