论文部分内容阅读
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。“,”The effects of multiˉwall 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 conˉ tents 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 comˉ posites. A nonˉuniform dispersion leads to agglomeration of MWCNTs, which causes an earlyˉstage failure under loading. The elecˉ trical properties of the composites are less affected by the presence of agglomerates.