Application of anionic polyacrylamide to acidic/alkaline soils
What happens to anionic polyacrylamide in an acidic or alkaline environment?
1. Anionic polyacrylamide partially carboxymethyl in an acidic environment, but the anionic degree does not change. But polyacrylamide may hydrolyze under acidic conditions, that is, amide groups hydrolyze carboxymethyl, which will increase hydrolysis, because under one-sided conditions, one-sided
2. Anionic polyacrylamide is easily hydrolyzed, so the degree of hydrolysis may also increase. Generally speaking, it is less affected at one-sided, one-sided, and low temperatures.
Whether it is anionic polyacrylamide or cationic polyacrylamide, soil improvement is mainly achieved through the absorption of polymers by the soil. In soil improvement, cationic polyacrylamide, as a superabsorbent resin, can play the role of water retention agent; anionic polyacrylamide is a linear polymer with a long molecular chain that can play the role of soil retention agent. Anionic polyacrylamide has the same negative charge as the soil surface and should repel soil particles, but can bind to the soil through a cationic bridge.
The divalent cations (such as Ca2) in the soil can combine with the surface of the soil particles and the negative of the anionic polyacrylamide, respectively, to form a cation bridge, that is, PAM-Ca2 + -soil particles.
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