THE HYGROTHERMAL AGING BEHAVIOUR OF CARBON FIBER REINFORCED POLYTRIAZOLE RESIN COMPOSITES

Abstract

Abstract: The hygrothermal aging properties of the carbon fiber reinforced polytriazole resin composites (T700/PTA) were studied under the condition of 80℃ and 98% (relative humidity). Mechanical properties, moisture absorption characteristics and morphology changes of the composites were investigated by the weighing method, static and dynamic mechanical test as well as the SEM observation. The strength of composites can be fitted by semiempirical mathematical model, which was used to predicte the service lifetime of composites. The results show that the flexural strength and ILSS of composites are significantly affected by the hygrothermal environment, especially in the early aging period. Absorption characteristics of the composites obey Fick's second law in the first aging stage (diffusion coefficient D=1.129×10^-6mm²/s). Two transitions are found on the dynamic mechanical thermographs of the aging composites, while the secondary transition at lower temperature disappears after drying. The interaction at the fiber/resin interface weakens after aging. It is predicted that the lifetime of composites is 33600h when the strength retention remains 50%. The T700/PTA composites have excellent resistance to hygrothermal environment.

Key words: carbon fiber, polytriazole resin composites, hygrothermal aging, strength simulation, lifetime prediction

CLC Number:

TB332

LI Yu-ling, WAN Li-qiang, HUANG Fa-rong, DU Lei. THE HYGROTHERMAL AGING BEHAVIOUR OF CARBON FIBER REINFORCED POLYTRIAZOLE RESIN COMPOSITES[J]. COMPOSITES SCIENCE AND ENGINEERING, 2014, 0(11): 36-41.

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