静电植绒法处理多壁碳纳米管改性玻纤织物/环氧树脂复合材料的制备及力学性能

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。

Preparation and mechanical properties of MWCNTs modified glass fiber fabrics/epoxy composites disposed by electrostatic flocking method

In order to improve the mechanical properties of glass fiber reinforced epoxy composites, multi-walled carbon nanotubes (MWCNTs) were attached to glass fiber fabrics surface using electrostatic flocking method to get modified glass fiber fabrics. The MWCNTs modified glass fiber fabrics/epoxy composite laminates were prepared using method of vacuum assisted resin infusion (VARI) with low-viscosity epoxy and the prepared modified fabrics. The mechanical properties of the laminates were characterized. The fracture surfaces of the MWCNTs modified glass fiber fabrics/epoxy composite specimens after mechanical experiments were observed by SEM and OPM. The results show that compared with the unmodified glass fiber fabrics/epoxy composite laminates without MWCNTs, the tensile strength of MWCNTs modified laminates decreases by 10.24%, flexural strength decreases by 13.90%, and compressive strength decreases by 17.33%. The tensile modulus and flexural modulus improve by 19.38% and 16.04% respectively, while compressive modulus increases by 13%. The bondings between MWCNTs and glass fiber fabrics are weak and there are debondings and delaminations between them under tensile loading. After the modified glass fiber fabrics treated by hot pressing at 200 ℃ for 2 h, the mechanical properties of MWCNTs modified glass fiber fabrics/epoxy composite laminates increase. The interface bondings between resin and glass fiber fabrics is improved after hot pressing treatment.