Thermal conductivity of polymer composites with the geometrical characteristics of graphene nanoplatelets.
Thermal conductivity of polymer composites with the geometrical characteristics of graphene nanoplatelets.
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DOI：
10.1038/srep26825
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发表时间：
2016-05-25
影响因子：
4.6
通讯作者：
Kim SY
中科院分区：
文献类型：
--
作者：
Kim HS;Bae HS;Yu J;Kim SY
与填充有石墨烯纳米片（GNP）的复合材料的热导率相关的最重要的物理因素之一是GNP的尺寸，即它们的横向尺寸和厚度。在这项研究中，我们揭示了聚合物复合材料的热导率和聚合物复合材料内GNP填料的实际尺寸之间的关系（使用三维（3D）非破坏性微X射线CT分析测量），同时最大限度地减少尺寸以外的物理参数的影响。较大的横向尺寸和厚度的GNP增加的可能性的矩阵结合的界面被减少，导致在一个有效的改善在复合材料的导热性和散热能力。根据填料的尺寸，导热系数提高了121%;填充20wt%GNP的复合材料的最高体导热系数和面内导热系数值分别为1.8和7.3 W/m·K。当与所采用的聚合物基质的热导率值（0.24 W/m·K）相比时，体热导率值和面内热导率值分别增加了650%和2，942%。
One of the most important physical factors related to the thermal conductivity of composites filled with graphene nanoplatelets (GNPs) is the dimensions of the GNPs, that is, their lateral size and thickness. In this study, we reveal the relationship between the thermal conductivity of polymer composites and the realistic size of GNP fillers within the polymer composites (measured using three-dimensional (3D) non-destructive micro X-ray CT analysis) while minimizing the effects of the physical parameters other than size. A larger lateral size and thickness of the GNPs increased the likelihood of the matrix-bonded interface being reduced, resulting in an effective improvement in the thermal conductivity and in the heat dissipation ability of the composites. The thermal conductivity was improved by up to 121% according to the filler size; the highest bulk and in-plane thermal conductivity values of the composites filled with 20 wt% GNPs were 1.8 and 7.3 W/m·K, respectively. The bulk and in-plane thermal conductivity values increased by 650 and 2,942%, respectively, when compared to the thermal conductivity values of the polymer matrix employed (0.24 W/m·K).