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为提高玻纤增强环氧树脂复合材料的力学性能,采用静电植绒法将多壁碳纳米管(MWCNTs)附着在玻纤织物表面,得到改性的玻纤织物。利用一种低黏度的环氧树脂和所制得的改性织物,采用真空辅助成型工艺(VARI)制备了MWCNTs改性格玻纤织物/环氧树脂复合材料层合板,表征了层合板的力学性能。对进行力学实验后的MWCNTs改性玻纤织物/环氧树脂复合材料试样断口进行了SEM和OPM观察。结果显示:与未添加MWCNTs的玻纤织物/环氧树脂复合材料层合板相比,添加了MWCNTs的层合板的拉伸强度降低了10.24%,弯曲强度降低了13.90%,压缩强度降低了17.33%,拉伸模量和弯曲模量分别提高了19.38%和16.04%,压缩模量提高了13%;MWCNTs与玻纤织物之间的结合较弱,在拉伸作用下,存在明显的脱粘和分层;将改性玻纤织物在200℃下热压处理2h后,制备的MWCNTs改性玻纤织物/环氧树脂复合材料层合板的力学性能均有所提高,热压处理后树脂与玻纤织物之间的界面结合得到改善。
In order to improve the mechanical properties of glass fiber reinforced epoxy composites, multi-walled carbon nanotubes (MWCNTs) were attached to the surface of glass fiber fabrics by electrostatic flocking to obtain modified glass fiber fabrics. MWCNTs modified glass fiber fabric / epoxy composite laminates were prepared by vacuum assisted forming process (VARI) using a low viscosity epoxy resin and the modified fabrics. The mechanical properties of the laminates . The fracture of MWCNTs modified glass fiber fabric / epoxy composite after mechanical test was observed by SEM and OPM. The results show that the tensile strength of the laminate with MWCNTs is reduced by 10.24%, the bending strength is reduced by 13.90% and the compressive strength is reduced by 17.33% compared with the glass fiber fabric / epoxy composite laminates without MWCNTs. , The tensile modulus and flexural modulus increased by 19.38% and 16.04%, respectively, and the compressive modulus increased by 13%. The bonding between MWCNTs and glass fiber fabric was weak, and under the action of tension, there was obvious debonding and The mechanical properties of the prepared MWCNTs modified glass fiber fabric / epoxy composite laminates were improved after hot pressing at 200 ℃ for 2h. The resin and glass The interfacial bonding between the fabrics is improved.