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采用示差扫描量热仪,力学性能测试,扫描电镜分析和热重分析研究了在双酚F环氧树脂/酸酐固化体系中加入纳米粒子型增韧剂的效果。并以加入纳米粒子增韧剂的树脂体系为基体,碳纤维平纹布为增强体,通过真空辅助树脂传递模塑(VARTM)工艺制备了复合材料,对其力学性能和微缺陷进行了研究。结果表明,加入纳米粒子型增韧剂后,在弯曲强度损失较小的情况下,浇注体的拉伸性能有所提高,冲击韧性大幅增加。制备的复合材料树脂/纤维浸润良好,没有干斑存在,微缺陷较少,力学性能优异,有望用于VARTM成型大型汽车结构部件的制造。
The effect of adding nano-particle toughening agent in bisphenol F epoxy resin / anhydride curing system was investigated by DSC, mechanical property test, SEM and TG analysis. The mechanical properties and microdefects of the composites were also studied by using the resin system with nano-particle toughener as the matrix and the carbon fiber plain weave as the reinforcement. The composites were prepared by vacuum assisted resin transfer molding (VARTM). The results show that with the addition of nano-particle toughening agent, the tensile properties of the castable have been improved and the impact toughness increased significantly with less loss of flexural strength. The prepared composite resin / fiber has good infiltration, no dry spots, few micro-defects and excellent mechanical properties, and is expected to be used for the manufacture of large automobile structural parts with VARTM molding.