Abstract An anisotropic conductor with graphene nanoplatelets (GNPs) well planar aligned in PP matrix has been obtained in this work through multi-melt multi-injection molding (M3IM). In this method, a second composite melt penetrated the first melt and products with three layers (skin layer, intermediate layer and core layer) were obtained. The GNPs in the three layers was entirely planar oriented along machine direction (MD) owing to the second shear flow and confined interface between intermediate layer and core layer. The finely aligned structure drastically elevated in-plane thermal conductivity of intermediate layer to as high as 7.32 W m−1 K−1 and highlighted an average thermal conductive anisotropy of 20.86 under 25 wt % GNPs loading, as well as provided a good electric conductivity of 0.03 S m−1 in MD while insulativity in perpendicular direction. Additionally, the M3IM composite performed well in mechanical properties with tensile strength (40.33 MPa) and Young's modulus (1.15 GPa). This M3IM manufacturing provides outstanding anisotropic properties to the injection products which possess a considerable potential application in unilateral conduction field.

中文翻译：

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通过多熔体多次注射成型 (M3IM) 制造的高度各向异性功能导体：多种熔体流动和受限界面的协同作用

摘要 在这项工作中，通过多熔体多注射成型 (M3IM) 获得了石墨烯纳米片 (GNP) 在 PP 基质中平面排列良好的各向异性导体。在该方法中，第二复合熔体渗透第一熔体并获得具有三层（表层、中间层和芯层）的产品。由于第二个剪切流和中间层和核心层之间的受限界面，三层中的 GNP 沿机器方向 (MD) 完全平面取向。精细排列的结构大大提高了中间层的面内热导率高达 7.32 W m-1 K-1，并在 25 wt % GNPs 负载下突出了 20.86 的平均导热各向异性，并提供了良好的导电性的 0。03 S m-1 MD 方向，而垂直方向绝缘。此外，M3IM 复合材料在机械性能方面表现良好，拉伸强度 (40.33 MPa) 和杨氏模量 (1.15 GPa)。这种 M3IM 制造为注射产品提供了出色的各向异性特性，这些产品在单边传导场中具有相当大的潜在应用。