Explanation

It is a macromolecule polymer formed by polymerization of acrylamide monomer. It has a linear structure and can also be crosslinking to form a network structure. PAM exists in many forms, including internal color powder, translucent beads and flakes. This polymer can be soluble in water in any proportion, slightly soluble in some specific solvents such as glacial acetic acid, ethylene glycol, glycerol and lactic acid, but almost insoluble in organic solvents. The preparation methods of PAM include solution polymerization or inverse suspension polymerization with persulfate and other initiator. In the preparation process, PAM can appear in various forms, such as powder, aqueous solution, lotion and bead. PAM is usually non-toxic in biological applications and has good biocompatibility, but its monomer is toxic, which may affect the neuromuscular function and have certain irritation to the skin. Therefore, in medical PAM, the content of free monomer is usually limited to 0.05%. PAM has cohesive and flocculating properties, so it is often used as medical adhesive and synthetic physiological mucus. In addition, the hydrogel of PAM shows good anticoagulation and hydrolysis resistance stability, and strong water absorption, so it can be used for applications such as activated carbon coated particles for blood perfusion. One of the biggest uses of PAM is as a liquid coagulant, which is widely used in water treatment, papermaking and other fields to help the particles suspended in the liquid gather and form flocs, so as to facilitate solid-liquid separation and other treatment.

Classification