Systematic variation of copolymers (Poly (ethylene-covinylacetate)) composition provide an opportunity to change matrix polarities and thus explore their effects on the polymer/filler interactions and composite properties. The main objective of this work is to study the effect of vinyl acetate (VA) content on the extent of exfoliation and dispersion of thermally reduced graphite oxide (TrGO), as well as its impact on the thermal conductivity and mechanical properties of the resultant composites. The use of ethylene vinyl-acetate (EVA) copolymers of different (0–40 wt%) vinyl acetate content with similar melt viscosities allowed us to keep the processing conditions constant and quantitatively compare the thermal conductivity and mechanical properties of composites with different matrix polarities. Composites with conductive graphite (GT) and multiwalled carbon nanotubes (MWCNT) were also prepared and examined for comparison. Melt dispersion of TrGO in EVA copolymers was quantified using a range of characterization techniques: transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray scattering measurements. Electron microscopy and X-ray diffraction revealed highly exfoliated morphology of TrGO throughout the entire matrix, while GT remained multi-layer even after melt processing. Nanocomposites reinforced with TrGO showed significantly improved thermal conductivities and mechanical properties combined with low rheological percolation thresholds comparable to those achieved using MWCNT and GT. We propose a formalism to assess the thermal conductivity and mechanical properties of graphene nanocomposites based upon the interfacial excess energies of EVA copolymers.

共聚物（聚（乙烯-乙酸乙烯酯））组成的系统变化为改变基质极性提供了机会，从而探讨了它们对聚合物/填料相互作用和复合材料性能的影响。这项工作的主要目的是研究乙酸乙烯酯（VA）含量对热还原氧化石墨（TrGO）的剥落和分散程度及其对所得复合材料的导热性和机械性能的影响。使用不同（0–40 wt％）乙酸乙烯酯含量的乙烯乙酸乙烯酯（EVA）共聚物和相似的熔体粘度使我们能够保持加工条件恒定，并定量比较具有不同基质极性的复合材料的导热性和机械性能。还制备了具有导电石墨（GT）和多壁碳纳米管（MWCNT）的复合材料，并进行了比较研究。TrGO在EVA共聚物中的熔体分散度使用一系列表征技术进行了定量：透射电子显微镜（TEM），扫描电子显微镜（SEM）和X射线散射测量。电子显微镜和X射线衍射显示TrGO在整个基体中高度剥落，而GT甚至在熔融加工后仍保持多层。用TrGO增强的纳米复合材料显示出显着改善的热导率和机械性能，并具有与使用MWCNT和GT可比的低流变渗透阈值。