MTDSC at the glass transition - Quantitative use of the phase lag correction - The effects of long annealing times

A study of the effects of changing sample mass and purge gas on the phase l ag and calculation of the out of phase (kinetic) component for polystyrene in MTDSC was undertaken. The results confirm those from an earlier study th at suggested the kinetic signal is unchanged by altering these parameters t hus it is probably a correct quantitative measure of this signal. The effec ts of long annealing times were also studied and it was shown that all the signals of MTDSC are affected in contrast to a previous study showing that for moderate annealing the reversing and kinetic signals are substantially invariant. Nevertheless the non-reversing signal remains useful for charact erising relative enthalpy losses.