The percentage coagulum test is used to measure the amount of coagulum (or extended polymer) which is formed during a reaction. This material is essentially lost raw materials and can also cause plant issues if it is formed in high quantities.
Coagulum is formed when an emulsion locally splits normally due to shearing forces caused by the stirrer combined with high temperature spikes in the reaction. This therefore is a measure of the stability and consistency of the polyacrylamide emulsion formed and its resistance to high temperatures. As the emulsion locally splits; this allows some of the formulation to invert and so the polymer is able to thicken locally, this is normally found on or around the stirrer.
Following the production of a PAM emulsion during a standard reaction, the amount of coagulum produced is separated and weighed to give a percent concentration.
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