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为研究玻璃纤维(GF)表面纳米SiO2改性对GF增强树脂基复合材料力学性能的影响,利用真空辅助模压(VAMP)工艺制备了不同含量的纳米SiO2表面改性GF增强聚环状对苯二甲酸丁二醇酯(PCBT)复合材料。分析了GF表面改性对GF/PCBT复合材料力学性能的影响,研究了纤维表面改性对GF/PCBT复合材料抗湿热老化性能的影响规律。纤维拔出试验结果表明:经表面处理的GF/PCBT复合材料的界面剪切强度提高了1.16倍;采用含量为0.5wt%和2wt%(与树脂质量比)的纳米SiO2处理GF表面后,复合材料的三点弯曲强度分别提高1.5倍和1.67倍,弯曲模量分别提高1.03倍和1.17倍。SEM结果显示:当纳米SiO2用量为2wt%时,破坏后的纤维表面被树脂完全覆盖,树脂与纤维粘结良好。在湿热条件下,由于纳米SiO2颗粒的存在,水分子很难通过界面相扩散到改性后的材料内部,其抗湿热性能提高。
In order to study the effect of nano-SiO2 surface modification on the mechanical properties of GF reinforced resin matrix composites, different content nano-SiO2 surface-modified GF reinforced polycyclic p-phenylenediamine Butyl formate (PCBT) composites. The effect of GF surface modification on the mechanical properties of GF / PCBT composites was analyzed. The effect of fiber surface modification on the wet heat aging resistance of GF / PCBT composites was studied. The results of fiber pull-out test showed that the interfacial shear strength of surface-treated GF / PCBT composites increased by 1.16 times. After the surface of GF was treated with nano-SiO2 with content of 0.5wt% and 2wt% (and resin mass ratio) Three-point bending strength of the material increased 1.5 times and 1.67 times respectively, flexural modulus increased by 1.03 times and 1.17 times respectively. SEM results showed that when the amount of nano-SiO2 was 2wt%, the damaged fiber surface was completely covered by the resin, and the resin was well bonded with the fiber. Under wet and hot conditions, due to the presence of nano-SiO2 particles, it is difficult for water molecules to diffuse into the modified material through the interfacial phase and the anti-wetting property is improved.