The main products of polyacrylamide are cationic, anionic and nonionic. Cationic polyacrylamide is mainly distinguished by ionic degree, which can be divided into 5-70 ionic degree models. Anionic polyacrylamide is divided according to its molecular weight, which ranges from 6 million to 22 million. Nonionic polyacrylamide is also a kind of linear polymer with molecular weight ranging from 6 million to 12 million. Why is cationic polyacrylamide not expressed by molecular weight? What is its molecular weight? Can anionic polyacrylamide and nonionic polyacrylamide be expressed by ionicity? What is the difference and relationship between the ionic degree and molecular weight of polyacrylamide?

In fact, if we understand the difference between the molecular structure of cation, anion and nonion, we can understand the difference between the expression of ionic degree and molecular weight. The molecular structure of cationic polyacrylamide is a network polymer, while the molecular structure of anionic polyacrylamide and nonionic polyacrylamide is a linear polymer; the ionic degree represents the ionic charge density, and the molecular weight represents the length of the molecular chain in the molecule; therefore, anionic polyacrylamide and nonionic polyacrylamide can not be expressed by ionic degree for the reason that they have different molecular structures from cationic polyacrylamide, and the molecular weight of cationic polyacrylamide is 12 million.