Abstract
The transition temperatures of amorphous and crystalline polyamido-imides (PAI) have been determined by thermo-mechanical and dilatometric methods. Heating an amorphous PAI to above the glass temperature ( T g) was found to cause it to crystallize and this produces peaks on the thermomechanical and dilatometric curves. The softening range of crystalline PAI is accompanied by spontaneous elongation; the likely reason is the formation of a flat texture with a dominance of the molecular axis in the plane of the film.
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