纳米Al2O3及酚酞聚芳醚酮改性环氧复合材料性能

通过机械分散技术制备了纳米Al₂O₃ /环氧、酚酞聚芳醚酮/环氧和纳米Al₂O₃/ 酚酞聚芳醚酮/环氧复合材料，并对比研究了其拉伸模量、拉伸强度、断裂性能和热性能。结果表明：纳米Al₂O₃及酚酞聚芳醚酮在环氧树脂中呈均匀的分散状态；纳米Al₂O₃使环氧树脂拉伸模量增加，使拉伸强度先增后降；酚酞聚芳醚酮使环氧树脂拉伸模量略微下降，对拉伸强度影响不明显；纳米Al₂O₃/酚酞聚芳醚酮/环氧三元复配体系的拉伸模量和拉伸强度呈非单调变化的趋势；纳米Al₂O₃和酚酞聚芳醚酮对环氧树脂均有增韧作用，三元复配体系增韧效果更明显，表现出协同增韧效果；高含量纳米Al₂O₃降低了环氧树脂的初始分解温度，而其余填料对环氧树脂热稳定性具有改善作用，填料均使环氧树脂玻璃化转变温度有所降低。

Performance of epoxy matrix composites filled with nano-Al2O3 and phenolphthalein polyaryletherketone

Nano-Al₂O₃/epoxy, phenolphthalein polyaryletherketone (PAEK)/epoxy and nano-Al₂O₃/PAEK/epoxy composites were prepared by mechanical mixing process. The tensile modulus, tensile strength, fracture toughness and thermal stability of the composites were comparatively studied. The results indicate that both nano-Al₂O₃ and PAEK are homogeneously dispersed in the epoxy martix. In the case of nano-Al₂O₃/epoxy composites, with the increase of nano-Al₂O₃ content, the tensile modulus increases monotonously, and the tensile strength increases first then decreases. In the case of PAEK/epoxy composites, the tensile modulus decreases slightly, and the tensile strength does not change significantly. In the case of nano-Al₂O₃/PAEK/epoxy ternary composites, the tensile modulus and the tensile strength show non-monotonous changes. Both nano-Al₂O₃ and PAEK can toughen the epoxy more or less. The toughening effect of the ternary composites is more obvious, and the combination of nano-Al₂O₃ and PAEK exhibits synergistic toughening effect. The high content nano-Al₂O₃ lowers the initial decomposition temperature of epoxy, while the other fillers improve the thermal stability of epoxy slightly. The glass transition temperature of the epoxy resin is found to be depressed with the fillers.