Abstract This study presents a new process for producing nanocomposite powders for use in various manufacturing processes such as laser sintering or dry powder impregnation techniques for thermoplastic composites manufacture. Polyetherimide (PEI) was used as a polymeric coating/shell to encapsulate nanoparticles on the surface of poly ether ether ketone (PEEK) particles, which were used as a core matrix. Nanoparticles with different morphologies, known to enhance thermal and electrical performance of polymers: 2D graphene nanoplatelets (GNPs) and inorganic fullerene-like tungsten disulfide (IF-WS2) in different concentrations (0.1, 1, and 5 wt%) were incorporated in the shell structures. The coated powders had approximately the same particle size distribution as the uncoated, plain powders, which is an indication that the shell was in nm size and the coating process did not affect the overall size of the particles. Furthermore, the core-shell particles exhibit a smoother surface and an improved flowability after coating. The Transmission Electron Microscopy (TEM) images of the nanocomposite particles cross-section area confirmed the formation of core-shell structure, and the presence of the nanoparticles embedded into the shell layer. The scanning electron microscopy (SEM) images showed a homogeneous distribution of nanoparticles within the coating layer at lower nanoparticle concentrations (0.1 and 1 wt%).

中文翻译：

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具有核壳结构的纳米复合粉末的制备

摘要 本研究提出了一种生产纳米复合粉末的新工艺，可用于各种制造工艺，例如用于热塑性复合材料制造的激光烧结或干粉浸渍技术。聚醚酰亚胺 (PEI) 用作聚合物涂层/壳，以将纳米颗粒封装在聚醚醚酮 (PEEK) 颗粒表面，用作核心基质。具有不同形态的纳米颗粒，已知可增强聚合物的热和电性能：2D 石墨烯纳米片 (GNP) 和不同浓度（0.1、1 和 5 wt%）的无机富勒烯类二硫化钨 (IF-WS2) 被纳入壳结构。包覆粉末与未包覆的普通粉末具有大致相同的粒度分布，这表明壳的尺寸为纳米，并且涂层过程不会影响颗粒的整体尺寸。此外，核壳颗粒在涂覆后表现出更光滑的表面和改进的流动性。纳米复合颗粒横截面的透射电子显微镜 (TEM) 图像证实了核壳结构的形成，以及嵌入壳层中的纳米颗粒的存在。扫描电子显微镜 (SEM) 图像显示，在较低的纳米颗粒浓度（0.1 和 1 重量％）下，纳米颗粒在涂层内均匀分布。纳米复合颗粒横截面的透射电子显微镜 (TEM) 图像证实了核壳结构的形成，以及嵌入壳层中的纳米颗粒的存在。扫描电子显微镜 (SEM) 图像显示，在较低的纳米颗粒浓度（0.1 和 1 重量％）下，纳米颗粒在涂层内均匀分布。纳米复合颗粒横截面的透射电子显微镜 (TEM) 图像证实了核壳结构的形成，以及嵌入壳层中的纳米颗粒的存在。扫描电子显微镜 (SEM) 图像显示，在较低的纳米颗粒浓度（0.1 和 1 重量％）下，纳米颗粒在涂层内均匀分布。