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The use of dielectric analysis for the determination of the glass transition temperature for polymers is reviewed. Both a sharp increase in the permittivity and the dielectric loss peak have been correlated with the glass transition. Dielectric data for an epoxy sin and Polyvinylchloride are presented and compared with data obtained by differential anning calorimetry (DSC). The dielectric glass transition approaches the DSC glass transition as the frequency of the dielectric measurement is decreased. The effects of contact resistance and moisture on the dielectric measurement are also discussed.
glass transition temperature, dielectric properties, permittivity, loss factor, epoxies, polyvinylchloride
School of Chemical Engineering, Georgia Institute of Technology, Atlanta, GA
Auburn International, Danvers, MA