Zam. Ishak et Jp. Berry, HYGROTHERMAL AGING STUDIES OF SHORT CARBON-FIBER-REINFORCED NYLON-6.6, Journal of applied polymer science, 51(13), 1994, pp. 2145-2155
A study of hygrothermal aging, in terms of the kinetics of moisture ab
sorption by nylon 6.6 and its carbon fiber-reinforced composites, has
been undertaken. The diffusion of water into the various materials was
investigated at 100% relative humidity, by immersion of specimens in
water at temperatures of between 25 and 100-degrees-C. A mathematical
treatment used in analyzing the data was that of a single free phase m
odel of diffusion, which assumed Fickian diffusion and utilized Fick's
second law of diffusion. Good agreement was observed between the expe
rimental and theoretical values. The equilibrium moisture content and
the apparent diffusion coefficient of the various composites were eval
uated. Hygrothermal aging has reduced the tensile properties of both u
nreinforced and reinforced nylon 6.6, albeit a better recoverability o
f the properties was achieved by the former after drying. This behavio
r is explained in terms of the combined action of moisture-induced pla
sticization and interfacial degradation. (C) 1994 John Wiley & Sons, I
nc.