Abstract
The mechanical loss maximum in polycaprolactam in the vicinity of −50°C at a frequency of ∼10 Hz (β transition) was shown not to be related directly to the presence of moisture in the polymer. This transition is also observed in dried caprone (vacuum drying at 10−4 torr and 180°C for 30 h) after a few days following annealing. The β maximum was shown by IR spectroscopy to decrease and shift towards lower temperatures when hydrogen bonding is weakened as a result of prior heating or compression strain. A conclusion is drawn concerning the relationship between the β transition and hydrogen bonding which fixes the amide groups in the amorphous polymer phase.
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