In this paper, the surface hydroxylation modification of nano-alumina (nano-Al₂O₃) to result nano-Al₂O₃–OH and the chemical modification of graphene oxide (GO) by using silane coupling agent to produce GO-KH560 were first carried out respectively, followed by solution compounding to synthesis a novel three-dimensional functional hybrid filler (nano-Al₂O₃–OH/GO-KH560), and then polyamide 6 (PA6)/nano-Al₂O₃–OH/GO-KH560 (abbreviated as P-A_-OH-G_-KH560) thermally conductive nanocomposites were fabricated by melt blending technique and investigated for its morphological, mechanical and thermal properties. Morphological characterization revealed better dispersion of nano-Al₂O₃ and GO in the PA6 nanocomposites, which is attributed to the improved interfacial interaction between the PA6 and hybrid fillers. Loading of the hybrid fillers in the PA6 nanocomposites resulted in the significant improvement in mechanical properties such as tensile strength and elastic modulus and this effect is more pronounced on the increasing the hybrid fillers loading amount, when compared to the PA6 and pristine nano-Al₂O₃ filled system. Differential scanning calorimetric analysis showed that the crystallization of the PA6 nanocomposites was improved. The thermal conductivity of the P-A_-OH-G_-KH560 (100/5/0.8) nanocomposite increased by 86.13% compared with that of pure PA6. In summary, PA6 nanocomposites with fairly good mechanical and thermal conductivity are obtained at low filler contents.

本文对纳米氧化铝（nano-Al ₂ O ₃）的表面羟基化改性以产生纳米Al ₂ O ₃ -OH以及使用硅烷偶联剂对氧化石墨烯（GO）进行化学改性以生产GO-KH560分别被首先进行，接着溶液的配料以合成一种新型三维官能混杂填料（纳米的Al ₂ ö ₃ -OH / GO-KH560），然后聚酰胺6（PA6）/纳米的Al ₂ ö ₃ - OH / GO-KH560（缩写为PA _-OH -G _-KH560通过熔融共混技术制备了导热纳米复合材料，并对其形态，机械和热性能进行了研究。形态表征表明，纳米Al ₂ O ₃和GO在PA6纳米复合材料中的分散性更好，这归因于PA6与杂化填料之间界面相互作用的改善。杂化填料在PA6纳米复合材料中的负载导致机械性能（例如拉伸强度和弹性模量）的显着改善，并且与PA6和原始纳米Al ₂相比，这种影响在杂化填料负载量的增加上更加明显Ø ₃填充系统。差示扫描量热分析表明，PA6纳米复合材料的结晶得到了改善。与纯PA6相比，PA _-OH -G _-KH560（_100/5 / 0.8）纳米复合材料的导热系数提高了86.13％。总之，在低填料含量下可获得具有相当好的机械和导热性的PA6纳米复合材料。