环氧树脂/聚多巴胺改性铝粉导热绝缘复合材料的制备与性能研究

采用化学包覆的方法在平均粒径分别为4.5 μm和20 μm的铝(Al)粉上包覆一层有机聚多巴胺(PDA)，以环氧树脂(EP)为基体，包覆改性后的铝粉（PDA@Al）为导热填料，采用浇铸法制备了高导热绝缘环氧基复合材料(EP/PDA@Al)。结果表明，PDA@Al的加入有利于提高EP的热稳定性以及热导率，且当PDA@(20 μm)Al的含量为20 %(质量分数，下同)时，复合材料的热导率为0.521 W/（m·K），相比纯EP的热导率提高了184 %；相对纯Al填充的EP复合材料，EP/PDA@Al复合材料的绝缘性能显著提高。

Preparation and Properties of Thermal Conductive Insulating Composites of Epoxy Resin/Polydopamine Modified Aluminum Powders

Aluminum powder was first coated with a layer of polydopamine (PDA) and then was introduced into an epoxy resin forming a high thermal conductive insulation composite (EP/PDA@Al).When the content of coated Al particles was 20 wt%, the thermal conductivity of the composite reached 0.521 W/(m·K), which was 184 % higher than that of neat EP.The coating of PDA made Al particles more effective in enhancing of thermal conductivity.