通过使用二甲基亚胺（DMF）而非丙酮作为溶剂，提高环氧/石墨烯纳米复合材料的热导率
Superior enhancement in thermal conductivity of epoxy/graphene nanocomposites through use of dimethylformamide (DMF) relative to acetone as solvent
AI总结：
研究比较了DMF和丙酮作为溶剂对环氧/石墨烯复合材料热导率的影响，发现DMF可使热导率提高44%，并提供更均匀的石墨烯分散。
摘要：
本文展示使用二甲基亚胺（DMF）作为溶剂可更有效地分散石墨烯纳米片到环氧基质中，从而提高环氧-石墨烯纳米复合材料的热导率。尽管之前已讨论过溶剂对机械性能的作用，但本研究首次探讨了溶剂对热导率增强的影响，并为高热导率聚合物复合材料提供了新途径。均匀分散石墨烯纳米颗粒可改善聚合物与石墨烯之间的热接触，从而提高界面热导率。有机溶剂通常用于高效分散石墨烯到环氧基质中。本研究比较了两种有机溶剂DMF和丙酮在分散石墨烯到环氧基质中的效率及其对复合材料热导率增强的影响。发现使用DMF制备的聚合物-石墨烯复合材料在7重量百分比填料含量下热导率比使用丙酮的高44%。激光扫描共聚焦显微镜（LSCM）成像显示，使用DMF制备的石墨烯-环氧复合材料表现出更均匀的石墨烯纳米片分散，而丙酮基样品的石墨烯聚集体大至211%。与有效介质理论的比较显示，DMF相对于丙酮制备的复合材料石墨烯与环氧之间的界面热阻低35%。这些结果为实现更高热导率的石墨烯-环氧复合材料提供了根本性的新途径，对广泛热管理技术具有重要价值。
英文摘要：
In this work, we demonstrate that use of dimethylformamide (DMF) as a solvent leads to better dispersion of graphene nanoplatelets in epoxy matrix compared to acetone solvent, in turn leading to higher thermal conductivity epoxy-graphene nanocomposites. While role of solvents in enabling superior mechanical properties has been addressed before, outlined study is the first to address the effect of solvents on thermal conductivity enhancement and provides novel pathways for achieving high thermal conductivity polymer composite materials. Uniform dispersion of graphene nanoparticles into epoxy can improve thermal contact with polymer leading to superior interface thermal conductance between polymer matrix and graphene. Organic solvents are typically employed to achieve efficient dispersion of graphene into the epoxy matrix. In this study, we compare the effect of two organic solvents, dimethylformamide (DMF) and acetone, in terms of their efficiency in dispersing graphene into the epoxy matrix and their effect on enhancing thermal conductivity of the composite. We find that polymer-graphene composites made with DMF solvent show 44% higher thermal conductivity compared to those made using acetone at 7 weight% filler composition. Laser scanning confocal microscopy (LSCM) imaging reveals that graphene-epoxy composites, prepared using DMF as solvent, exhibit more uniform dispersion of graphene-nanoplatelets compared to the case of acetone with acetone-based samples exhibiting up to 211% larger graphene agglomerations. Comparison with effective medium theory reveals an almost 35% lower interface thermal resistance between graphene and epoxy for DMF relative to acetone prepared composite. These results provide fundamentally new avenues to achieve higher thermal conductivity graphene-epoxy composites, of key importance for a wide range of thermal management technologies.
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