Abstract
The dynamic mechanical properties of poly(hexamethylene isophthalamide) and poly(dodecamethylene terephthalamide) have been determined over a wide range of temperature at low frequencies (∼ 1 c/s) by torsion pendulum measurements and at high frequencies (∼ 500 c/s) by a vibrating reed technique. It has been shown that absorbed moisture leads to the appearance of an intermediate loss peak at temperatures in the range −20°C to −70°C, between the main glass/rubber transition at 120°C and a low temperature process with a peak near −150°C. Unlike other polyamides such as nylon 6-6, the main glass/rubber transition is unaffected by moisture.
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