The use of thermomechanical analysis (TMA) as a tool for assignment of glass transition temperatures, Tg, is discussed in this paper. An attempt to address the minimum requirements of TMA instrumentation necessary for Tg assignments is included. The subject of temperature calibration of the TMA instrument, which is a prerequisite for any temperature of transition assignment, is discussed. Methodology is offered for using the TMA nstrument in the expansion mode for Tg assignments. In addition, TMA methodology mploying a flat-tipped penetration probe for the assignment of the softening temperature, Ts, is also given here. For most amorphous materials, Ts is very close to the Tg value assigned by expansion TMA or differential scanning calorimetry (DSC).
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