According to the synthesis conditions (including monomer shape, medium state), the polymerization of synthetic rubber can be divided into four processes: bulk polymerization, gas phase polymerization, emulsion polymerization and solution polymerization.
The bulk polymerization has the advantages of high purity, no degassing, dehydration and no treatment, but it is difficult to dissipate heat and has a slow polymerization rate, which is not suitable for rubber synthesis (but suitable for certain polymer materials such as plexiglass). synthesis). Although the post-treatment of gas phase polymerization is simple, the steps of monomer recovery, solvent or diluent recovery, dehydration and drying can be omitted, but it is not suitable for non-gaseous monomers above C4, and has limited application in elastomer polymerization, only applicable to three. Ethylene propylene rubber.
Therefore, the synthetic methods widely used in rubber synthesis are also emulsion polymerization and solution polymerization.