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首页> 外文期刊>Journal of Applied Polymer Science >Structure and dielectric breakdown strength of nano calcium carbonate/polypropylene composites
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Structure and dielectric breakdown strength of nano calcium carbonate/polypropylene composites

机译：纳米碳酸钙/聚丙烯复合材料的结构和介电击穿强度

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摘要

Nanodielectrics, a 21st-century phenomena, is envisioned to be the answer for material challenges in progressive high-voltage technology. It is well known that the proper dispersion of nanoparticles plays a key role in improving the dielectric properties of a material, but to understand where changes in the properties of a material originate, it is also essential to reveal the multiscale structure of the material. In this study, the dielectric permittivity, breakdown strength, and structure of nano calcium carbonate (nano-CaCO_3)/polypropylene composites with 1.8-8.1 wt % doping were characterized systematically. The combined results from transmission electron microscopy, Raman microscopy, and optical microscopy show that the quality of nanodispersion was similar in all of the filler concentrations studied. However, all of the samples also contained smoothly distributed microparticles. The density of the microparticles increased exponentially when the concentration of nano-CaCO_3 was increased in the manufacturing process. The dielectric direct-current breakdown of the composites had a maximum at 1.8 wt % concentration and then decreased as the filler concentration was increased. The differences could be explained by the existence of large microparticles rather than the quality of the nanoparticle dispersion; this indicated the importance of multiscale characterization.
机译：纳米电介质是21世纪的一种现象，可以预见它可以解决先进的高压技术中的材料挑战。众所周知，纳米粒子的适当分散在改善材料的介电性能方面起着关键作用，但是要了解材料性能的变化源于何处，揭示材料的多尺度结构也是必不可少的。在这项研究中，系统地表征了掺杂1.8-8.1 wt％的纳米碳酸钙（nano-CaCO_3）/聚丙烯复合材料的介电常数，击穿强度和结构。透射电子显微镜，拉曼显微镜和光学显微镜的综合结果表明，在所有研究的填料浓度下，纳米分散体的质量均相似。但是，所有样品还包含光滑分布的微粒。当纳米CaCO_3的浓度在制造过程中增加时，微粒的密度呈指数增长。复合材料的介电直流击穿在浓度为1.8 wt％时达到最大值，然后随着填料浓度的增加而降低。差异可以通过存在大颗粒而​​不是纳米颗粒分散体的质量来解释。这表明了多尺度表征的重要性。

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