Polyacrylamide according to its structure can be divided into anionic, cationic, non-ionic and amphoteric four types. Referring to polyacrylamide technical indicators, many users know the molecular weight of this index, and few people mention the ‘degree of hydrolysis’ of this index, then anionic polyacrylamide hydrolysis degree what does it mean? What role does it play in the product use process? Today we will explain the importance of the degree of hydrolysis for anionic polyacrylamide.
What is the degree of hydrolysis
The “degree of hydrolysis” of anionic polyacrylamide is the percentage of the amide group converted into carboxyl group in the PAM molecule during hydrolysis, but because the carboxyl group number is difficult to determine, the “hydrolysis ratio” is commonly used in practical applications, that is, the weight ratio of the amount of sodium hydroxide and the amount of PAM during hydrolysis.
A more professional solution is that the so-called degree of hydrolysis of polyacrylamide refers to the ability of weak ions in the polyacrylamide solution to combine with water to form a weak alkali or weak acid, or the strength of the formation of weak acid in the polyacrylamide solution and the strength of the ability to form a weak reduction.
For strong acids and bases, the greater the degree of ionization, the stronger the corresponding acid and base, and the weaker their degree of hydrolysis. For some soluble polyacrylamides, the greater the degree of ionization corresponds to the more ionized ions, and the weaker their degree of hydrolysis. In general, the greater the degree of ionization, the weaker their degree of hydrolysis, on the contrary, the smaller the degree of ionization, the greater the degree of hydrolysis. In general, when comparing the concentration of ions in the solution of acids or salts with acid group ions, it is necessary to pay attention to their degree of ionization and hydrolysis.
