环氧/纳米SiO_2杂化浆料的制备及其对碳纤维复合材料性能的影响

Preparation of Epoxy/Nano-SiO_2 Hybrid Sizing and Effects on the Properties of Carbon Fiber Composites

采用溶胶 凝胶技术制备了环氧 /纳米SiO2 杂化浆料,对杂化浆料膜的结构和性能进行了表征分析,同时研究了该浆料对碳纤维复合材料性能的影响。首先制备了(γ 异氰酸酯基)丙基三乙氧基硅烷接枝的环氧树脂,利用该树脂对纳米SiO2 先驱体进行原位改性,制备碳纤维表面环氧 /纳米SiO2 杂化浆料。采用FT IR,AFM和综合热分析仪对纳米SiO2 先驱体的原位改性结构、浆料膜的显微形态和相态及其热性能进行分析,成功制备了环氧 /纳米SiO2 杂化浆料,SiO2 以纳米尺度均匀地分布于杂化浆料膜中,纳米SiO2 的引入使杂化浆料膜的热性能得到了提高。采用该杂化浆料对碳纤维表面进行改性,复合材料力学性能研究表明,杂化浆料可同时提高复合材料的层间剪切强度和冲击性能。

Epoxy/nano-SiO2 hybrid sizing for carbon fiber surface was prepared through sol-gel reaction, the structure and properties of the sizing films were analyzed, and the effects of the sizing on the properties of composites were also investigated. First, epoxy resin was grafted by γ-isocyanatopropyltriethoxysilane to modify in situ nano-SiO2 precursors, then epoxy/nano-SiO2 hybrid sizing was made by using the modified nano-SiO2 precursors. FT-IR, AFM and Thermoanalysis Instrument were employed to analyze the structure of modification in situ of nano-SiO2 precursors, the micro-morphology and thermal properties of the sizing films. The results indicated that epoxy/nano-SiO2 hybrid sizing was prepared successfully, SiO2 particles dispersed in the hybrid sizing film homogeneously with nanoscale, the thermal properties of the hybrid sizing film were improved because of the introduction of nano-SiO2. Carbon fibers were modified by the epoxy/nano-SiO2 hybrid sizing to confirm that the hybrid sizing increased both ILSS and impact properties of the composites through the investigation of mechanical properties.