Polyacrylamide is a linear polymer mainly divided into two forms: dry powder and colloid. According to its average molecular weight, it can be divided into three categories: low, medium, and high molecular weight. According to its structure, it can be divided into non-ionic, anionic and cationic.
When we use polyacrylamide, we generally need to dissolve it in water and wait until the polymer chain is fully extended. It takes a certain time to wait until it is completely dissolved. Generally speaking, the dissolution time of anionic and non-ionic is about half an hour, while cationic polyacrylamide may take a little longer about 1 hour, and then polyacrylamide will dissolve. So will the dissolution rate of polyacrylamide be affected by the dosage?
Generally speaking, the dissolution rate of polyacrylamide is only affected by molecular weight, and is not affected by dosage and complete dissolution time. If the dosage is not large, the dissolution time and speed will not be affected by the dosage. However, the stirring speed will have a certain effect on the dissolution time of polyacrylamide. The faster the stirring speed of polyacrylamide of the same molecular weight, the shorter the dissolution rate, but the viscosity is very low. This is because the amide group not only forms intramolecular hydrogen bonds but also hydrogen bonds with water molecules after dissolution. The faster the stirring speed will make the polyacrylamide intramolecular hydrogen bonds form a rigid ring chain and helical structure.
So when we use polyacrylamide, if we are not in a hurry, we can slowly wait for it to dissolve before using it.