Glass Transition of Elastomers Using Thermal Analysis Techniques

Abstract

Abstract The paper defines the glass transition temperature ( T g ) of elastomers using various thermal analysis techniques (differential scanning calorimetry, DSC; derivative DSC; thermomechanical analysis, TMA; dynamic mechanical analysis, DMA; dielectric analysis, DEA; thermal stimulated current, TSC) and compares T g values of eight elastomers by the first four techniques. Comparison of T g by two TMA methods (expansion and penetration) is also included. Necessary information regarding both the specific technique and the sample used to compare published data is mentioned. Their inclusion, along with the T g data, is emphasized. Correlation of T g , as determined by thermal methods with that determined by an industrial low-temperature test method (ASTM D 1053-89a) is discussed. The factors that are unique to elastomer T g determination, such as subambient operation, as compared to other polymers, are pointed out.