What causes emulsions to clump when heated?
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It is known that when an acrylate emulsion sample is heated and stirred under vacuum, caking occurs? Temperature: 55-65, pressure: 0.85 vacuum level (for the circulation water pump). Does anyone know what’s going on? Is it demulsification caused by excessive heating, or cross-linking and curing (cross-linking agents are added during the synthesis of the emulsion)? Furthermore, clumping also occurred during post-polymerization of this sample after adding a redox initiator; the amount and concentration of the initiator reduced, which led to a decrease in the formation of lumps, but they still appeared. Why? Thank you!
Heating will definitely cause clumping – due to thermal motion, collisions between molecules increase, leading to the formation of granules that then turn into lumps! Temperature is very sensitive to emulsions.