How is polyacrylamide-CO-sodium acrylate prepared?

Learn more. Polyacrylamide-co-sodium acrylate has been prepared via copolymerization of acrylamide and acrylic acid, or the hydrolysis of a pre-formed nonionic polymer. Both macromolecules had a charge of 24 mol% with a molar mass of 25 million g/mol.

How acrylamide and sodium 2-Acrylamido-2-methylpropane sulfonate emulsion COPO?

Then, acrylamide and sodium 2-acrylamido-2-methylpropane sulfonate were copolymerized with the surface vinyl group of modified nano silica via emulsion copolymerization, and water-soluble copolymer with nano silica structure was obtained.

Does synthesis method affect polyacrylamide solution properties and application performance?

The hydrolyzed macromolecules essentially functioned only as a coagulant generating pin flocs. Depending on the application, polymer structure can be tuned by the method of synthesis. To the authors' knowledge, this is the first report comparing the influence of synthesis method on polyacrylamide solution properties and application performance.

Which copolymers have a high molecular weight?

The proper copolymers had relatively high molecular weight (M w > 4 × 10 6 g mol −1) with effective thickening properties, temperature tolerance, and resistance to shear force as well as salt compression. The copolymers branched by 0.10 g of modified nano silica possess the highest viscosity, temperature, and tolerance as well as salt resistance.

Why do acrylamide copolymers Crimple at different temperature?

As is well known, the increase of temperature can give to crimple of acrylamide copolymer molecules due to its dehydrating and destruction of the associational structure . To further study the thermal stability of copolymers, viscosity measurement at different temperature from 25 to 65 °C was carried as shown in Fig. 12a.

What is the molecular weight of copolymers in NaCl aqueous solution?

The molecular weight determination of the copolymers was performed in 0.1 mol L −1 NaCl aqueous solution. For linear and branched copolymers in 0.1 mol L −1 NaCl aqueous solutions, the values of dn/dc are 0.1338 and 0.1442, respectively.