Composites of diamond-reinforced particles offer extraordinary thermal- and mechanical characteristics attributable to their manageable outer surface and huge available uppermost layer. Uniform distribution of diamond powder in polymeric matrix, and enhanced interactions between them are the two significant problems to attain robust polymer composites. In this work, the crystalline diamond particles as received and chemically modified ones were integrated in polyacrylonitrile (PAN) matrix uniformly by electrospinning method. This procedure avoided agglomeration of the reinforced diamonds through uniform distribution in the polymer matrix. The shapes of diamond-integrated PAN fibers were attuned by adapting diamond loading, polymer concentration, flow rate, and applied voltage to achieve beads free fibrous structures. PAN was chosen as a carrier polymeric-matrix to enhance the electrostatic forces between functionalized diamond-particles and PAN molecular chains. Tensile tests showed that the loading of 2 wt% modified diamond-particles improved Young’s modulus of fibers by 74.94% and tensile strength by 125%. Therefore, modification of the outer surface of the diamond particles improved the chemical interactions between the diamond surface and matrix, and stress was transferred to the diamond particles in composite fibers. Additionally, thermal stabilities of the diamond-based polymer composites were enhanced by the integration of diamond powder in composite fibers.

中文翻译：

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定制单晶金刚石增强聚丙烯腈基电纺纤维的结构，形态和力学特性

金刚石增强颗粒的复合材料具有出色的热和机械特性，这归因于其可控的外表面和巨大的可用最上层。金刚石粉末在聚合物基质中的均匀分布以及它们之间增强的相互作用是获得坚固的聚合物复合材料的两个重要问题。在这项工作中，通过电纺方法将收到的结晶金刚石颗粒和经过化学修饰的金刚石颗粒均匀地整合到聚丙烯腈（PAN）基质中。该过程避免了增强的金刚石通过在聚合物基体中的均匀分布而附聚。通过调整金刚石的负载量，聚合物的浓度，流速和施加的电压来调整金刚石集成PAN纤维的形状，以实现无珠的纤维结构。选择PAN作为载体聚合物基体，以增强功能化金刚石颗粒与PAN分子链之间的静电力。拉伸测试表明，负载2 wt％的改性金刚石颗粒可使纤维的杨氏模量提高74.94％，拉伸强度提高125％。因此，金刚石颗粒外表面的改性改善了金刚石表面与基体之间的化学相互作用，并且应力转移到了复合纤维中的金刚石颗粒上。另外，通过将金刚石粉末集成在复合纤维中，增强了金刚石基聚合物复合材料的热稳定性。拉伸测试表明，负载2 wt％的改性金刚石颗粒可使纤维的杨氏模量提高74.94％，拉伸强度提高125％。因此，金刚石颗粒外表面的改性改善了金刚石表面与基体之间的化学相互作用，并且应力转移到了复合纤维中的金刚石颗粒上。另外，通过将金刚石粉末集成在复合纤维中，增强了金刚石基聚合物复合材料的热稳定性。拉伸测试表明，负载2 wt％的改性金刚石颗粒可使纤维的杨氏模量提高74.94％，拉伸强度提高125％。因此，金刚石颗粒外表面的改性改善了金刚石表面与基体之间的化学相互作用，并且应力转移到了复合纤维中的金刚石颗粒上。另外，通过将金刚石粉末集成在复合纤维中，增强了金刚石基聚合物复合材料的热稳定性。