Polyvinyl chloride if produced by polymerization of the monomer vinyl chloride (VCM), as shown. About 80% of production involves suspension polymerizations. Emulsion polymerization accounts for about 12% and bulk polymerization accounts for 8%.
Suspension polmerizations affords partcles with a average diameters of 100-180 um, whereas emulsion polymerization gives much smaller particles of average size around 0.2um. The number average molecualer weights range from 45000 to 64000.
A degerdation process that starts above 130, once dehydrochlorination starts, it is autocatalytic. Agents of heat stabilizers are added to minize the loss of HCI.
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