It was found that, for all cases studied, relaxation time constants determined above and below T (g) did appear to extrapolate to the same value around T (g) indicating that molecular mobility measured above and below T (g) using different techniques is highly correlated.
TSDC proved to be very sensitive in detecting small reorientational motions in solids and in separating overlapping events with only slight differences in molecular motion exhibited as broad events in DSC. This allowed for detection of the rigid fraction of the amorphous drug, the sub-glass transition beta- relaxation in the polymer, and the limit of miscibility between the drug and the polymer in the solid dispersions.
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