首先通过溶胶-凝胶法将纳米二氧化硅(SiO2)包覆在羧基化处理后的多壁碳纳米管(MWCNTs)表面,形成具有核壳结构的SiO2@MWCNTs纳米尺度增强体,再将SiO2@MWCNTs核壳结构引入到环氧(EP)酸酐固化体系中制备了SiO2@MWCNTs/EP复合材料,研究SiO2@MWCNTs对复合材料力学性能和热性能的影响.结果表明:碳纳米管表面成功包覆了一层厚度约为24 nm的SiO2,包覆处理后的碳纳米管在环氧树脂中的分散性显著提高;当SiO2@MWCNTs掺杂量为0.5%和0.7%时,复合材料的冲击强度和弯曲强度分别达到最大值,比未改性的环氧树脂分别提高了101.4%和32.6%,同时复合材料的热稳定性也显著提高,说明包覆SiO2能有效提高MWCNTs的改性效果.
Nano-SiO2 was coated on the surface of multi-walled carbon nanotubes (MWCNTs) after carbox-ylation by sol-gel method, and a nano reinforcement SiO2@MWCNTs with core-shell structure were pre-pared. Then the SiO2@MWCNTs was added into the epoxy resin (EP) anhydride curing system to pre-pare SiO2@MWCNTs/EP composites. The effects of SiO2@MWCNTs on the mechanical and thermal prop-erties of the composites were studied. The results show that there is a layer of SiO2 on the surface of MWCNTs and its thickness is about 24 nm, and the dispersity of the MWCNTs after coating in the EP increases significantly. When the SiO2@MWCNTs content is 0.5% and 0.7%, the impact strength and bending strength of the composite reach the maximum value, which is 101.4% and 32.6% higher than that of EP respectively. Meanwhile, the thermal stability of the composite is also improved significantly, which indicates that coating with SiO2 can effectively improve the modification effects of MWCNTs.
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