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Reducing Interfacial Thermal Resistance Between Epoxy and Alumina via Interfacial Engineering
Physica Status Solidi (A) - Applications and Materials Science ( IF 2 ) Pub Date : 2023-03-30 , DOI: 10.1002/pssa.202200800
Wei Yang, Mengtao Zhang, Kun Wang, Jian Qiao, Yun Chen, Fangyuan Sun, Kun Zheng, Yushun Zhao, Daili Feng

Epoxy composites are increasingly employed in the information industry fields, where the interfacial thermal resistance of polymer/nanofiller is considered to be one of the most important factors affecting the thermal conductivity of polymer composites. Herein, the interfacial thermal resistance with different functionalized aluminas and epoxy is first investigated by molecular dynamics. The functional groups considered in aluminas are –OH, butyltrimethoxysilane terminating with –CH3, and aminopropyltriethoxysilane terminating with –NH2. The results indicate that aminopropyltriethoxysilane terminating with –NH2 has the best effect on reducing the interfacial thermal resistance up to 66.67%. The mechanism of interfacial thermal resistance reduction is analyzed through vibrational density of state and overlapping energy, and then the effect of functionalization on interfacial heat transfer is intuitively demonstrated through local thermal analysis. The most effective reduction of the thermal resistance is attributable to the functional groups containing the same group end group as epoxy and the moderate chain length, which can reduce the vibrational mismatch and form more effective heat conduction channels to enhance the thermal transport efficiency in the nanocomposite. This work can shed some light on designing and fabricating thermally conductive inorganic/polymer composite.

中文翻译:

通过界面工程降低环氧树脂和氧化铝之间的界面热阻

环氧复合材料越来越多地应用于信息产业领域,其中聚合物/纳米填料的界面热阻被认为是影响聚合物复合材料导热系数的最重要因素之一。在此,首先通过分子动力学研究了不同官能化氧化铝和环氧树脂的界面热阻。氧化铝中考虑的官能团是-OH、以-CH 3封端的丁基三甲氧基硅烷和以-NH 2封端的氨丙基三乙氧基硅烷。结果表明,氨基丙基三乙氧基硅烷以-NH 2封端降低界面热阻效果最好,可达66.67%。通过振动态密度和重叠能量分析界面热阻降低的机理,然后通过局部热分析直观地论证功能化对界面传热的影响。最有效的降低热阻归因于含有与环氧基相同的基团端基且链长适中的官能团,可以减少振动失配并形成更有效的导热通道,从而提高纳米复合材料的热传输效率。这项工作可以为导热无机/聚合物复合材料的设计和制造提供一些启示。
更新日期:2023-03-30
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