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Preparation of alumina-coated graphite for thermally conductive and electrically insulating epoxy composites

机译：用于导热和电绝缘环氧复合材料的氧化铝涂层石墨的制备

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摘要

Herein, highly thermally conductive and insulating epoxy composites were reported. Firstly uniform alumina-coated graphite flakes were successfully prepared by a two-step coating method of chemical precipitation with the aid of a sodium dodecyl sulfonate (SDS) surfactant using an inorganic precursor (aluminum nitrate) as the starting material. Then the alumina-coated graphite particles were incorporated into the epoxy resin. The thermal conductivity value of epoxy/alumina-coated graphite composite shows a significant increase from 0.22 W mK(-1) (neat epoxy) to 0.64 W mK(-1) by a factor of approximately 3 at the filler loading of 18.4%. Moreover, due to the presence of the alumina nanolayers coating on the graphite surface, epoxy/alumina-coated graphite composites could retain high electrical volume resistivity of >10(10) Omega cm up to high filler contents, which was much higher than that of epoxy/graphite composites (<10(5) Omega cm) at the same filler loadings. And they still could be regarded as insulators.
机译：在此，报道了高导热性和绝缘性的环氧复合材料。首先，以十二烷基磺酸钠（SDS）表面​​活性剂为辅助，以无机前驱物（硝酸铝）为起始原料，通过化学沉淀的两步涂覆方法成功地制备了均匀的氧化铝包覆的石墨薄片。然后将氧化铝涂覆的石墨颗粒掺入环氧树脂中。环氧/氧化铝涂层石墨复合材料的热导率值在填充量为18.4％时从0.22 W mK（-1）（纯环氧）显着增加到0.64 W mK（-1）约3倍。此外，由于在石墨表面上存在氧化铝纳米层涂层，环氧/氧化铝涂覆的石墨复合材料可以保持> 10（10）Omega cm的高体积电阻率，直至高填充物含量，远高于相同填料填充量的环氧/石墨复合材料（<10（5）Ω厘米）。而且它们仍然可以视为绝缘体。

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