A study of some linear aliphatic nylons by thermally stimulated creep

Abstract

SynopsisThe mechanical behavior of nylons 6,66,666,610,612,11, and 12 was studied using the method of thermally stimulated creep at 96°C. The resultant creep moduli were calculated. The strain recovery and strain recovery rates were measured and the retardation time spectra calculated as a function of temperature. The effects of humidity on the creep and subsequent recovery behavior were compared using samples conditioned to 0,33, and 97% relative humidity at room temperature.

Study of the Molecular Mobility in Polymers with the Thermally Stimulated Recovery Technique—A Review

“…More recent works, where TSR is applied to the study of the temperature-dependent characteristics of materials, namely their phase transitions and molecular mobility, can be found in the literature, besides the classical works of references (4 -11). Some examples are mentioned here: investigations of the a-relaxation dynamics in amorphous (14,15) or semi-crystalline polymers (16,17), copolymers or blends (18,19) and thermosets (20,21), studies of secondary relaxations (16,22), analysis of the effects of humidity on the creep and recovery behavior of linear aliphatic nylons (23), characterization of the interface/ interphase in composites (24,25), and evaluation of the compatibility of different phases and phase separation in interpenetrated networks (26).…”

Creep enhanced adsorbtion of water or aqueous zinc chloride solution increases the creep rate of nylon 6,6

“…The absorption of water by nylon decreases the modulus and yield stress, lowers the transition temperature, T g , and increases toughness in proportion to the amount of water absorbed 1–3. The creep modulus of nylons is also lowered by water 4. Aqueous ZnCl 2 solutions decrease the modulus and yield stress more than water alone 5, 6.…”