Polymerization reaction may take place in any of the three states of matter- solid, liquid, gas. The solid state reactions are usually slow, they are not considered practical for this reason. The gas-phase reactions do take place but normally they require maintenance of high temperatures, a condition in which almost all high molecular weight polymers become unstable. Hence almost all commercial process of polymerization are liquid phase reactions.
Polymerization Techniques by Jim Livingston on Scribd
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