碳纳米管/石墨烯纳米片/聚氨酯杂化纳米复合材料的石墨烯类型依赖性：微观力学模型和力学性能
Graphene type dependence of carbon nanotubes/graphene nanoplatelets polyurethane hybrid nanocomposites: Micromechanical modeling and mechanical properties
摘要：
通过拉伸强度、硬度、冲击强度和改进的Halpin-Tsai方程，研究了多壁碳纳米管（MWCNTs）和石墨烯纳米片（GNP）混杂聚氨酯（PU）纳米复合泡沫的微观力学模型和力学性能。三种类型的石墨烯，具有不同的薄片尺寸和比表面积（SSA），被用来研究石墨烯类型对MWCNT/GNP杂化纳米填料的协同效应的影响。结果表明，MWCNTs和GNP-1.5（1：1）之间具有显著的协同效应，当纳米填料含量为0.25wt%时，PU的拉伸强度提高了43%，而PU/MWCNTs和PU/GNP-1.5的拉伸强度分别提高了19%和17%。利用单胞模型成功地预测了协同效应，计算结果与实验结果一致。
英文摘要：
Micromechanical modeling and mechanical properties of polyurethane (PU) hybrid nanocomposite foams with multi-walled carbon nanotubes (MWCNTs) and graphene nanoplatelets (GNPs) were investigated by mean of tensile strength, hardness, impact strength and modified Halpin-Tsai equation. Three types of graphene, with varied flake sizes and specific surface areas (SSA), were utilized to study the effect of graphene types on the synergistic effect of MWCNT/GNP hybrid nanofillers. The results indicate a remarkable synergetic effect between MWCNTs and GNP-1.5 (1:1) with a flake size of 1.5 μm and a higher SSA (750 m^2/g), which tensile strength of PU was improved by 43% as compared to 19% for PU/MWCNTs and 17% for PU/GNP-1.5 at 0.25 wt% nanofiller loadings. The synergy was successfully predicted using unit cell modeling, in which the calculated data agrees with the experimental results.
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