Anionic polyacrylamide is easily soluble in cold water, and the relative molecular weight has little effect on its insolubility. However, when the concentration of pam polyacrylamide with high relative molecular weight exceeds 10%, it will form a gel-like structure. The increase in temperature can slightly promote dissolution, but the dissolution temperature should not exceed 50 degrees Celsius to prevent molecular degradation. In order to obtain good water dispersibility, commercial polyacrylamide anionic is preferably made into flakes and granules.
If the anionic polyacrylamide is first dispersed in the water-soluble alcohol, and then added to the water with stirring, the dissolution rate will be greatly accelerated. The dissolution rate of anionic pam polyacrylamide in water is not affected by pH value. But for partially hydrolyzed products, if the pH value is alkaline, the dissolution rate will increase slightly. When the pH value is greater than 10.5, the pam polyacrylamide will be hydrolyzed. Dilute solutions of unhydrolyzed pam polyacrylamide are unaffected by most inorganic salts. However, high-value salts will precipitate polyacrylamide anionic with a degree of hydrolysis of 45%, because high-valent metal salts and hydroxyl groups will form water-insoluble salts.
Certain compounds, such as ethylene glycol, glycerol, morpholine, propylene glycol, and alcohol-ethylene oxide adducts, have effective solvating effects on it, acting as plasticizers for polymers. It is insoluble in most non-polar organic solvents, as well as in acetone and methanol. You can purify pam polyacrylamide by precipitation in methanol or acetone. The impurities can be removed by washing the pam polyacrylamide with methanol or acetone containing 20%-30% water.
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