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Thermally conductive polyamide 6/carbon filler composites based on a hybrid filler system

机译：基于混合填料体系的导热聚酰胺6 /碳填料复合材料

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We explored the use of a hybrid filler consisting of graphite nanoplatelets (GNPs) and single walled carbon nanotubes (SWCNTs) in a polyamide 6 (PA 6) matrix. The composites containing PA 6, powdered GNP, and SWCNT were melt-processed and the effect of filler content in the single filler and hybrid filler systems on the thermal conductivity of the composites was examined. The thermal diffusivities of the composites were measured by the standard laser flash method. Composites containing the hybrid filler system showed enhanced thermal conductivity with values as high as 8.8 W (m K)?1, which is a 35-fold increase compared to the thermal conductivity of pure PA 6. Thermographic images of heat conduction and heat release behaviors were consistent with the thermal conductivity results, and showed rapid temperature jumps and drops, respectively, for the composites. A composite model based on the Lewis–Nielsen theory was developed to treat GNP and SWCNT as two separate types of fillers. Two approaches, the additive and multiplicative approaches, give rather good quantitative agreement between the predicted values of thermal conductivity and those measured experimentally.
机译：我们探讨了在聚酰胺6（PA 6）基质中使用由石墨纳米片（GNP）和单壁碳纳米管（SWCNT）组成的混合填料的用途。对包含PA 6，GNP和SWCNT的复合材料进行熔融加工，并研究了单一填料和混合填料体系中填料含量对复合材料导热系数的影响。复合材料的热扩散率通过标准激光闪光法测量。包含混合填料体系的复合材料显示出更高的导热率，其值高达8.8 W（m K）？1 ，与纯PA 6的导热率相比增加了35倍。复合材料的热导率和放热行为与热导率结果一致，并且分别显示出快速的温度跳跃和下降。建立了基于Lewis-Nielsen理论的复合模型，将GNP和SWCNT视为两种单独的填充剂。两种方法，加法和乘法法，在热导率的预测值和实验测得的值之间具有相当好的定量一致性。

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