Micromechanics prediction of the effective elastic moduli of graphene sheet-reinforced polymer nanocomposites
Micromechanics prediction of the effective elastic moduli of graphene sheet-reinforced polymer nanocomposites
复制标题
石墨烯片增强聚合物纳米复合材料有效弹性模量的微观力学预测
DOI：
10.1088/0965-0393/18/4/045005
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发表时间：
2010-06-01
影响因子：
1.8
通讯作者：
Feng, Xi-Qiao
中科院分区：
文献类型：
--
作者：
Ji, Xiang-Ying;Cao, Yan-Ping;Feng, Xi-Qiao
我们使用Mori-Tanaka微观力学方法研究了石墨烯片分散在聚合物纳米复合材料中的刚性效应。石墨烯片增强复合材料的有效弹性模量首先通过假设所有的石墨烯片在聚合物基体中对齐或随机取向，同时保持它们的片状形状来预测。结果表明，非常低含量的石墨烯片可以显著提高复合材料的有效刚度。通过与碳纳米管（另一种有前途的聚合物复合材料纳米填料）的比较，进一步验证了石墨烯片作为一种增强体的优越性。此外，我们分析了几个关键的物理机制，可能会影响增强效果，包括团聚，堆叠和卷起的石墨烯片。结果揭示了这些因素将在何种程度上对石墨烯片增强纳米复合材料的弹性模量产生负面影响。这一理论研究有助于理解相关的实验结果，并促进这类新型的和非常有前途的纳米复合材料的力学表征和优化合成。
We investigate the stiffening effect of graphene sheets dispersed in polymer nanocomposites using the Mori-Tanaka micromechanics method. The effective elastic moduli of graphene sheet-reinforced composites are first predicted by assuming that all the graphene sheets are either aligned or randomly oriented in the polymer matrix while maintaining their platelet-like shape. It is shown that a very low content of graphene sheets can considerably enhance the effective stiffness of the composite. The superiority of graphene sheets as a kind of reinforcement is further verified by a comparison with carbon nanotubes, another promising nanofiller in polymer composites. In addition, we analyze several critical physical mechanisms that may affect the reinforcing effects, including the agglomeration, stacking-up and rolling-up of graphene sheets. The results reveal the extent to which these factors will negatively influence the elastic moduli of graphene sheet-reinforced nanocomposites. This theoretical study may help to understand the relevant experimental results and facilitate the mechanical characterization and optimal synthesis of these kinds of novel and highly promising nanocomposites.