TW EASTERN CHEM SINGAPORE PTE.LTD
Effect of Reaction Temperature on Molecular Weight of Polyacrylamide
Polyacrylamide (PAM) is a kind of organic
macromolecule polymer with wide usages. Molecular weight and solubility are
important indexes to measure its properties. In actual production, the main
factors affecting its performance are reaction temperature, acidity and
alkalinity, monomer concentration and initiator. The effect of temperature on
molecular weight is described below.
Temperature
is the main factor affecting free radical polymerization. Higher temperature
will increase the activity of monomer free radicals and speed up the
polymerization, but it will affect the degree of polymerization, resulting in
lower relative molecular weight. When the reaction temperature is too high, the
free radicals will suddenly increase rapidly, which will lead to the aggregation
of molecules, and make the molecules interlinked to form gel insoluble matter.
When the reaction temperature is too low, it will lead to long reaction time
and reduce production efficiency. Therefore, it is an important guarantee to
get high-quality products to master the appropriate temperature. A large number
of experiments in our company have proved that the ideal reaction temperature is
at 20-30 degrees.