Change in electrical resistivity of some high polymers during isothermal polymerization

Epoxy, polyester, and styrene isothermal polymerizations have been monitored electrically. Sample resistivity—time records at different temperatures are reported for each class of polymer. These plots suggest that relative rates of reaction could be conveniently obtained if a correlation between extent of polymerization and electrical resistivity were known for the particular resins studied. Qualitative agreement between changes in infrared absorption and changes in volume resistivity as a measure of the extent of polymerization has been obtained.