Abstract Alumina-coated graphite (Al2O3@graphite) core-shell particles were firstly synthesized by a liquid-phase chemical precipitation with the aid of sodium dodecyl sulfonate (SDS) surfactant using an inorganic precursor, then to fabricate thermally conductive and electrically insulating phthalonitrile composites by a hot-compression method. The obtained composite with 40 wt% Al2O3@graphite exhibited a thermal conductivity of 1.409 W/mK, 6.6 times that of pristine phthalonitrile matrix (0.214 W/mK). And the composites still retained electrical insulation below 20 wt% Al2O3@graphite content. Moreover, excellent thermal stabilities had been observed, compared with the glass transition temperature of pristine phthalonitriles (460 °C), the glass transition temperature of the composites decreased slightly but still high. Additionally, at 20 wt% content, the weight loss temperature (T5 and T10) and the char yield at 1000°C (Yc1000) were 525 °C, 589 °C and 74.9% which was 8 °C, 14 °C and 3.1% higher than that of pristine phthalonitriles, respectively, which holds potential for use in the high temperature thermal management.

中文翻译：

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具有热稳定性的导热和电绝缘氧化铝涂层石墨/邻苯二甲腈复合材料

摘要 采用无机前驱体，借助十二烷基磺酸钠 (SDS) 表面活性剂，通过液相化学沉淀法合成氧化铝包覆石墨 (Al2O3@graphite) 核壳颗粒，然后制备导热、电绝缘的邻苯二甲腈复合材料。通过热压方法。所获得的含有 40 wt% Al2O3@graphite 的复合材料的热导率为 1.409 W/mK，是原始邻苯二甲腈基质 (0.214 W/mK) 的 6.6 倍。并且复合材料仍保持低于 20 wt% Al2O3@graphite 含量的电绝缘性。此外，还观察到优异的热稳定性，与原始邻苯二甲腈的玻璃化转变温度 (460 °C) 相比，复合材料的玻璃化转变温度略有下降，但仍然很高。此外，