4. Suspension polymerization
In this type of process, the water-insoluble monomer is suspended in droplets by vigorous mechanical agitation, stabilized by suspending and dispersing agents. The initiator used must be hydrophobic, such as benzoyl peroxide, in order to solubilize in the monomer droplets. Two cases are to be considered, depending on the solubility of the polymer in its monomer:
if it is soluble (as in the case of styrene or methyl methacrylate), polymerization takes place in a homogeneous medium inside each droplet, which can then be considered as a mini-mass polymerization reactor;
Otherwise, we're dealing with precipitation polymerization (as in the case of vinyl chloride) in each droplet.
One of the advantages of suspension polymerization is the ability to achieve high molar masses without viscosity problems....
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Suspension polymerization
Emulsion polymerization
Bibliography
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Patents
Process for the production of poly-epsilon-caprolactones and poly-epsilon-caprolactones with high molecular weights obtainable by this process. Solvay EP 0 626 405 B1 (1994).
Bulk reactive extrusion polymerization process producing aliphatic ester polymer compositions. US Pat. 5,969,089 (1999).
Batchwise preparation of crosslinked, finely divided polymers BASF. US Pat. 4,873,299 (1989).
Process for the production of...
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