Abstract
In this work, the aging of two different carbon fiber reinforced cyanate ester polymer matrices (CFRP-A and CFRP-B) was investigated after their exposure to aggressive thermo-oxidative conditions. The materials’ degradation at 230℃ under 1 atm for 30 days in oxidative atmosphere was evaluated with regard to changes in mass (mass loss), glass transition temperature Tg, interlaminar shear strength, as well as physical characteristics that were examined under scanning electron microscopy. For both the systems, the aging study showed significant mass loss that reached ∼4% in the case of CFRP-B. The mass loss is accompanied with a considerable decrease in interlaminar shear strength and Tg properties. The study of the scanning electron microscopic images clearly shows the surface deterioration due to the oxidation process, accompanied with formation of matrix microcracking and development of matrix-fiber interfacial debonding. The contribution of the chains scission to the materials degradation was also detected by performing in situ aging through isothermal thermo-gravimetric analysis measurements at 230℃ under oxidative and inert atmosphere. However, the thermo-gravimetric analysis results showed minor chain scission proving thus, that the oxidation was the main degradation mechanism for both materials.
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