Abstract A common problem in thermal conductive materials is poor interface compatibility between fillers and the matrix, which has caused high interfacial thermal resistance and lower thermal conductivity than expected. In this work, highly reactive graphene oxide (GO) was introduced as a bridge to simplify the complex surface treatment between inactive boron nitride (BN) and inert polyolefin matrix. Through electrostatic self-assembly and rapid alkylation modification in aqueous solution, the BN coated by modified GO (BN@MGO) is acquired. After treatment, the surface concentration of C element has increased for an order of magnitude, which builds a strong interface interaction between fillers and polypropylene (PP). Later in-situ reduction improved phonon matching of hybrid fillers and furtherly reduced phonon interface scattering. The effects of structure and dispersion on performance were characterized. The thermal conductivity of PP/BN@RGO composites is 22.8 and 1.9 times higher than that of the raw PP and PP/BN, respectively. Modified Hashin-Shtrikman model demonstrates that PP/BN@RGO composites possess lower thermal resistance. Tortuous path effect and high thermal stability make the composites exhibit highly flame-retardant property. The thermal expansion coefficient of the material is also effectively reduced to 26.58 ppm/°C. The comprehensive features of PP/BN@RGO make it a promising material with broad potential in highly efficient heat dissipation electronic equipment, household appliances and thermal management field.

中文翻译：

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氮化硼自组装包覆结构促进聚合物复合材料的热性能和尺寸稳定性

摘要 导热材料的一个普遍问题是填料与基体的界面相容性差，导致界面热阻高，导热系数低于预期。在这项工作中，高反应性氧化石墨烯 (GO) 被引入作为桥梁，以简化惰性氮化硼 (BN) 和惰性聚烯烃基体之间的复杂表面处理。通过静电自组装和水溶液中的快速烷基化改性，得到了改性GO包覆的BN（BN@MGO）。处理后，C元素的表面浓度增加了一个数量级，从而在填料和聚丙烯（PP）之间建立了强烈的界面相互作用。后来的原位还原改善了混合填料的声子匹配，并进一步减少了声子界面散射。表征了结构和分散对性能的影响。PP/BN@RGO 复合材料的热导率分别是原始 PP 和 PP/BN 的 22.8 倍和 1.9 倍。改进的 Hashin-Shtrikman 模型表明 PP/BN@RGO 复合材料具有较低的热阻。曲折路径效应和高热稳定性使复合材料表现出高度的阻燃性能。材料的热膨胀系数也有效地降低到 26.58 ppm/°C。PP/BN@RGO的综合特性使其成为一种很有前途的材料，在高效散热电子设备、家用电器和热管理领域具有广阔的潜力。分别比原料 PP 和 PP/BN 高 9 倍。改进的 Hashin-Shtrikman 模型表明 PP/BN@RGO 复合材料具有较低的热阻。曲折路径效应和高热稳定性使复合材料表现出高度的阻燃性能。材料的热膨胀系数也有效地降低到 26.58 ppm/°C。PP/BN@RGO的综合特性使其成为一种很有前途的材料，在高效散热电子设备、家用电器和热管理领域具有广阔的潜力。分别比原料 PP 和 PP/BN 高 9 倍。改进的 Hashin-Shtrikman 模型表明 PP/BN@RGO 复合材料具有较低的热阻。曲折路径效应和高热稳定性使复合材料表现出高度的阻燃性能。材料的热膨胀系数也有效地降低到 26.58 ppm/°C。PP/BN@RGO的综合特性使其成为一种很有前途的材料，在高效散热电子设备、家用电器和热管理领域具有广阔的潜力。材料的热膨胀系数也有效地降低到 26.58 ppm/°C。PP/BN@RGO的综合特性使其成为一种很有前途的材料，在高效散热电子设备、家用电器和热管理领域具有广阔的潜力。材料的热膨胀系数也有效地降低到 26.58 ppm/°C。PP/BN@RGO的综合特性使其成为一种很有前途的材料，在高效散热电子设备、家用电器和热管理领域具有广阔的潜力。