通过机械共混法制备了Al_2O_3纳米粒子改性环氧树脂基体,研究了纳米粒子含量对改性树脂基体力学性能的影响,并采用紧凑拉伸实验研究了纳米粒子改性环氧树脂的断裂韧性.利用改性树脂制备了玻璃纤维增强复合材料,研究了改性复合材料的力学性能与纳米粒子含量之间的关系.结果表明:纳米粒子的加入明显改善了环氧树脂基体的断裂韧性并且有助于提高树脂与纤维之间的界面粘接强度,因而使改性复合材料的层间性能明显提高而其他力学性能基本不变.
The epoxy matrix toughened by nano-Al_2O_3 was prepared by mechanical mixing method. The mechanical properties of epoxy matrix with different nano-Al_2O_3 content were researched. The fracture toughness of the epoxy matrix was studied by compact tension test method. The glass-fiber reinforced composites were fabricated using the toughened epoxy matrix and the mechanical properties of the composites were investigated. The results indicate that the improved fracture toughness of epoxy matrix and the enhanced bonding between fibers and resin matrix can be attributed to the nanoparticles. Therefore, the interlaminar shear strength of the composites is improved obviously, while the other mechanical properties increase faintly.
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