纳米增韧三维正交玻璃纤维机织物增强环氧树脂复合材料的力学性能

为研究纳米改性对复合材料力学性能的影响，以纳米黏土改性环氧树脂与固化剂混合胶液为基体，以三维正交机织玻璃纤维织物为增强体，利用真空辅助树脂传递模压工艺（Vacuum assisted resin transfer molding，VARTM），制备纳米增韧三维正交玻璃纤维机织物增强环氧树脂复合材料。分别测试不同质量分数（1wt%、2wt%、3wt%、4wt%）纳米黏土改性复合材料沿0°和90°方向的弯曲和拉伸性能。结果表明:当纳米黏土质量分数为1wt%时，复合材料弯曲强度最大，沿0°和90°方向的弯曲强度分别增大了约7.21%和13.71%，弯曲模量分别增大了约5.69%和16.64%。当纳米黏土质量分数为3wt%时，复合材料拉伸强度最大，沿0°和90°方向的拉伸强度分别增大了约24.96%和27.93%，拉伸模量分别增加了约21.35%和13.26%。这是由于纳米黏土呈纳米尺度以片层状分散于环氧树脂中，增加了两相间的接触面积，提高纤维/树脂界面的结合力，进而增强了复合材料的力学性能。 

Mechanical properties of 3D orthogonal glass fiber woven fabric reinforced epoxy resin composites with nano clay modification

In order to study the effect of nano clay modification on the mechanical properties of composites, the 3 D orthogonal glass fiber woven fabric reinforced nano clay modification epoxy resin composites were manufactured by vacuum assisted resin transfer molding(VARTM) process. The bending and tensile properties of the composite modified with different mass fractions(1 wt%, 2 wt%, 3 wt%, 4 wt%) of nano clay in 0° and 90° directions were tested respectively. The results show that the composite with the nano clay fraction of 1 wt% has the highest bending strength and stiffness. And the bending strength in 0° and 90° directions have been increased by 7.21% and 13.71%, respectively. The bending modulus have been increased by 5.69% and 16.64%, respectively. In addition, the composite modified with 3 wt% nano clay has the best tensile properties. For the 0° and 90° directions, the corresponding tensile strength have been increased by 24.96% and 27.93%, respectively. And the tensile modules have been increased by 21.35% and 13.26%, respectively. Due to the contact area increase between fibers and epoxy resin, the interface bonding strength has been increased as nano clay is dispersed in the matrix in a nano scale layered form, the mechanical performance of the composite has been improved significantly.