Effects of carbon nanotube content on the mechanical and electrical properties of epoxy-based composites
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摘要:
以碳纳米管(MWCNT)为添加剂,制备出碳纳米管/ 环氧树脂复合材料,并探讨 MWCNT 质量分数对其力学和电学性能的影响。 结果表明,当 MWCNT 含量分别为 0. 1% 和 0. 25% 时,该复合材料的拉伸强度和弯曲模量达到最大值。 随着 MWCNT 含量的增加,拉伸模量增加和应变损坏率降低,这表明复合材料由塑性变形到脆性变形演变。 当 MWCNT 含量为 0. 05%时样品弯曲强度最高;当 MWCNT 含量为 0. 5%时,样品出现电渗流阈值。 MWCNT 在环氧树脂基体中的良好分散对提高复合材料力学性能起重要作用。 分散不均的 MWCNT 易团聚,会引起早期失效和电学性能降低。
Abstract:The effects of multi-wall carbon nanotube (MWCNT) content on the mechanical and electrical properties of MWCNT/ epoxy composites were investigated. Results indicate that both tensile strength and flexural modulus exhibit maxima at MWCNT contents of 0. 1% and 0. 25% (mass fraction), respectively. The tensile modulus increases and the strain to failuredecreases with MWCNT content, indicating a transition from plastic to brittle failure with increasing MWCNT content. The flexural strength of a sample with a MWCNT content of 0. 05% is the highest. The electrical percolation threshold of the composite is found to occur at a 0. 5% MWCNT addition. A good dispersion of MWCNTs in epoxy is important to improve the mechanical properties of the composites. A non-uniform dispersion leads to agglomeration of MWCNTs, which causes an early stage failure under loading. The electrical properties of the composites are less affected by the presence of agglomerates.
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