Langyou Chemical
SUPPLEMENTS
Anionic Polyacrylamide Synthesis
Synthesis of anionic polyacrylamide
Preparation of raw materials
To synthesize anionic polyacrylamide, it is first necessary to prepare all kinds of raw materials. Acrylamide monomer is its foundation, and high purity should be selected. The existence of impurities may disturb the reaction process and cause impure products. In addition, initiators are indispensable. Persulfate salts such as potassium persulfate and ammonium persulfate are often the choice for initiating polymerization reactions. Because of their ability to produce free radicals under specific conditions, they can promote monomer polymerization. Regulators are also important, such as mercaptoethanol, etc., which can control the molecular weight and molecular structure of the polymer to obtain ideal performance products.
The reaction conditions are set at
temperature as the key factor for the reaction. Generally speaking, the polymerization temperature is mostly controlled between 40 and 80 degrees Celsius. If the temperature is too low, the initiator will decompose slowly, free radicals will be generated less, and the polymerization rate will be slow; if the temperature is too high, the reaction will be too fast, difficult to control, or the product will have a wide molecular weight distribution. The pH value of the reaction system also needs to be adjusted. The weakly basic environment often favors the synthesis of anionic polyacrylamide. Under basic conditions, the monomer hydrolyzes to form carboxyl groups, which increases the anionic property of the product.
Synthesis step
First dissolve the acrylamide monomer in an appropriate amount of deionized water and prepare a solution at a certain concentration. Stir to fully dissolve, which is the foundation for the homogeneous reaction. Then add the initiator The amount of initiator is precisely controlled, and the reaction is more dramatic, and the reaction is less difficult to start. After adding, stir quickly to disperse evenly. Then, set the reaction system to a set temperature environment and the reaction lasts for several hours. During this time, closely observe the reaction phenomenon, such as the change of solution viscosity. With the progress of polymerization, the viscosity of the solution gradually increases. After the reaction, the crude product of anionic polyacrylamide is obtained.
Product Treatment
The crude product contains impurities such as unreacted monomers and initiator residues. In order to obtain high-purity products, purification treatment is required. The precipitation method is often used, and an appropriate amount of organic solvent such as ethanol is added to the product solution. Anionic polyacrylamide is precipitated due to differences in solubility. Filtered to obtain precipitation, and then washed several times with ethanol to Pure anionic polyacrylamide was obtained by drying the precipitate in an oven at a certain temperature. Through this series of steps, excellent anionic polyacrylamide can be obtained to meet the needs of various industries and scientific research.
Preparation of raw materials
To synthesize anionic polyacrylamide, it is first necessary to prepare all kinds of raw materials. Acrylamide monomer is its foundation, and high purity should be selected. The existence of impurities may disturb the reaction process and cause impure products. In addition, initiators are indispensable. Persulfate salts such as potassium persulfate and ammonium persulfate are often the choice for initiating polymerization reactions. Because of their ability to produce free radicals under specific conditions, they can promote monomer polymerization. Regulators are also important, such as mercaptoethanol, etc., which can control the molecular weight and molecular structure of the polymer to obtain ideal performance products.
The reaction conditions are set at
temperature as the key factor for the reaction. Generally speaking, the polymerization temperature is mostly controlled between 40 and 80 degrees Celsius. If the temperature is too low, the initiator will decompose slowly, free radicals will be generated less, and the polymerization rate will be slow; if the temperature is too high, the reaction will be too fast, difficult to control, or the product will have a wide molecular weight distribution. The pH value of the reaction system also needs to be adjusted. The weakly basic environment often favors the synthesis of anionic polyacrylamide. Under basic conditions, the monomer hydrolyzes to form carboxyl groups, which increases the anionic property of the product.
Synthesis step
First dissolve the acrylamide monomer in an appropriate amount of deionized water and prepare a solution at a certain concentration. Stir to fully dissolve, which is the foundation for the homogeneous reaction. Then add the initiator The amount of initiator is precisely controlled, and the reaction is more dramatic, and the reaction is less difficult to start. After adding, stir quickly to disperse evenly. Then, set the reaction system to a set temperature environment and the reaction lasts for several hours. During this time, closely observe the reaction phenomenon, such as the change of solution viscosity. With the progress of polymerization, the viscosity of the solution gradually increases. After the reaction, the crude product of anionic polyacrylamide is obtained.
Product Treatment
The crude product contains impurities such as unreacted monomers and initiator residues. In order to obtain high-purity products, purification treatment is required. The precipitation method is often used, and an appropriate amount of organic solvent such as ethanol is added to the product solution. Anionic polyacrylamide is precipitated due to differences in solubility. Filtered to obtain precipitation, and then washed several times with ethanol to Pure anionic polyacrylamide was obtained by drying the precipitate in an oven at a certain temperature. Through this series of steps, excellent anionic polyacrylamide can be obtained to meet the needs of various industries and scientific research.
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