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Dynamic mechanical properties of nylon 66 and the plasticizing effect of water vapor on nylon. II
Author(s) -
Quistwater J. M. R.,
Dunell B. A.
Publication year - 1959
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1959.070010302
Subject(s) - materials science , humidity , nylon 6 , dynamic modulus , composite material , dynamic mechanical analysis , modulus , dispersion (optics) , water vapor , dissipation , superposition principle , activation energy , nylon 66 , vibration , time–temperature superposition , viscoelasticity , thermodynamics , polymer , chemistry , optics , organic chemistry , physics , polyamide , quantum mechanics
The dynamic tensile modulus and energy loss have been measured for nylon 66 monofilaments at 9 and 60°C. over a wide humidity range in forced longitudinal vibration experiments. The frequency range covered was about 3 to 30 cycles/sec. (radian frequency 20 to 200 sec. −1 ). The results show dispersion of mechanical properties with change in humidity at both temperatures. At 60°C. a well‐defined maximum in the energy loss was observed, similar to that obtained previously at 35°C., but occurring at a somewhat lower water content. If a maximum in the energy loss exists at 9°C. (it is not well‐defined), it occurs very near 100% R.H. A time‐humidity superposition procedure is discussed by means of which the individual curves of modulus against frequency for the various humidities can be combined into a single “master curve” of modulus against reduced frequency. The order of magnitude of the activation energy for the dissipation mechanism has been estimated at 60–80 keal./mole.