Agustina Elsye, Goak Jeung Choon, Lee Suntae, Kim Yongse, Hong Sung Chul, Seo Yongho, Lee Naesung
Hybrid Materials Center (HMC), Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea.
Nanomaterials (Basel). 2023 Apr 10;13(8):1328. doi: 10.3390/nano13081328.
This study investigated the effect of graphite nanoplatelet (GNP) size and dispersion on the thermal conductivities and tensile strengths of epoxy-based composites. GNPs of four different platelet sizes, ranging from 1.6 to 3 µm, were derived by mechanically exfoliating and breaking expanded graphite (EG) particles using high-energy bead milling and sonication. The GNPs were used as fillers at loadings of 0-10 wt%. As the GNP size and loading amount increased, the thermal conductivities of the GNP/epoxy composites increased, but their tensile strengths decreased. However, interestingly, the tensile strength reached a maximum value at the low GNP content of 0.3% and thereafter decreased, irrespective of the GNP size. Our observations of the morphologies and dispersions of the GNPs in the composites indicated that the thermal conductivity was more likely related to the size and loading number of fillers, whereas the tensile strength was more influenced by the dispersion of fillers in the matrix.
本研究调查了石墨纳米片（GNP）尺寸和分散性对环氧基复合材料热导率和拉伸强度的影响。通过使用高能珠磨和超声处理机械剥离和破碎膨胀石墨（EG）颗粒，得到了四种不同片状尺寸（范围为1.6至3 µm）的GNP。GNP用作填料，含量为0 - 10 wt%。随着GNP尺寸和含量增加，GNP/环氧复合材料的热导率增加，但其拉伸强度降低。然而，有趣的是，无论GNP尺寸如何，拉伸强度在0.3%的低GNP含量时达到最大值，此后降低。我们对复合材料中GNP的形态和分散性的观察表明，热导率更可能与填料的尺寸和填充数量有关，而拉伸强度受填料在基体中的分散性影响更大。
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