Abstract
Improving the ablation-resistance of carbon fiber/epoxy composites is essential for structural-thermal protection integrated materials. In this work, silicone-grafted epoxy resin with high char yield was synthesized, and carbon fiber (CF) reinforced composites with different silicone content are manufactured. The effect of the pyrolysis behavior of the silicone-grafted epoxy on the mechanical properties and ablation resistance of the composites has been systematically investigated. The high-temperature properties were characterized by Interlaminar shear strength (ILSS) of unidirectional composites treated at 400 °C and 600 °C respectively, while the ablation-resistance properties were assessed by the mass and linear ablation rate of laminated composites at 1, 2.5, and 4 MW/m2 ablative heat flow density. It was found that the ILSS was improved by 228.13% and 151.79% after pyrolysis. Meanwhile, the silicone-grafted epoxy/CF composites exhibit a better ablation performance especially in 1 MW/m2. These results show that silicone-grafted epoxy/CF composites are expected to achieve the integration of high strength and ablation resistance as well as the integration of structural-thermal protection materials.
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