Abstract
The dynamic mechanical properties of 6-6 nylon, 6–10 nylon, and a nylon copolymer have been studied in the audio-frequency region over a temperature range extending from about 80°K. to near the melting point by driving rodlike samples in their first transverse mode of oscillation. In all nylon types tested, four dispersion regions are observed, the first three being at temperatures of approximately 170°, 250°, and 350°K. These dispersion regions appear both as peaks in the absorption curve and as relatively sharp drops in the resonance frequency curve. The magnitude and temperature positions of the damping maxima are dependent on the specific nylon type. Over parts of the temperature region the damping of 6-6 nylon depends on the thermal history and water content of the sample. Possible assignments for each of the observed dispersion regions in terms of molecular motion are given. Correlations between the dynamic mechanical data and the results of other physical measurements on the nylons are pointed out.
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