Reaction temperature affects the molecular weight of anionic PAM

PAM is an organic high molecular polymer that is widely used. The important indicators for measuring its performance are molecular weight and solubility. In actual production, the factors affecting its performance are mainly reaction temperature, pH, monomer concentration and initiator. The following mainly describes the effect of temperature on molecular weight.

Temperature is a major factor affecting free radical polymerization. Increasing the temperature increases the activity of monomeric free radicals and accelerates the rate of polymerization, but affects the degree of polymerization, resulting in lower relative molecular weight. When the reaction temperature is too high, the radicals will suddenly increase rapidly, causing the condensation to occur, and the molecules are hinged to each other to form a gel insoluble matter. If the reaction temperature is too low, the reaction time will be long, the reaction will be slow, and the efficiency will be affected. Therefore, mastering the suitable temperature is an important guarantee for obtaining high-quality products. After a lot of experiments by Noel Group, the temperature control is ideal at 20-30 degrees. .