Reduced interfacial thermal resistance in acidic alumina-filled adhesives for heat dissipative applications

IF 2.8 4区工程技术 Q2 POLYMER SCIENCE

Macromolecular Research Pub Date : 2024-06-04 DOI:10.1007/s13233-024-00276-4

Dong-In Shin, Jisung Lee, Chanseul Kim, Sung Woo Lee, So-Yeon Yoon, Ye-Jin Shin, Sooyeol Jeong, Gi-Ra Yi, Seung-Young Park, Gaehang Lee

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Abstract

Interfacial thermal resistance is crucial for determining the thermal conductivity of composites. Existing studies have explored hybrid filler systems and surface modification of alumina (Al₂O₃) particles for enhancing the thermal conductivities of polymer composites. In this study, highly acidic Al₂O₃ fillers were fabricated by modifying the raw Al₂O₃ surface using citric acid and glucose; the modified Al₂O₃ infiltrated an uncured epoxy adhesive at a concentration of 80 wt.%. The measured thermal conductivities of composites were up to 19.4% and 35.9% higher in glucose-filled and citric acid-filled Al₂O₃, respectively, compared with the raw Al₂O₃ at 25 °C. The experimental analysis and theoretical calculations revealed that the polar functionality on the surface facilitated hydrogen bonding between the filler and epoxy resin, which reduced the interfacial thermal resistance in the composite; this effect was the highest for the carboxyl group. To demonstrate the practical application of the modification technique, the exothermic performance test was conducted and indicated that a light-emitting diode lamp incorporating the citric acid filler-based composite exhibited excellent heat management performance compared to the raw Al₂O₃-applied composite.

Graphical abstract

Acidic Al₂O₃ fillers were prepared to reduce interfacial thermal resistance through hydrogen bonding, resulting in a modified particle-filled epoxy composite with enhanced thermal conductivity. The light-emitting diode (LED) lamp, utilizing epoxy adhesive with these modified Al₂O₃ fillers, demonstrated excellent heat dissipation capabilities

Abstract Image

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降低用于散热应用的酸性氧化铝填充粘合剂的界面热阻

界面热阻对于确定复合材料的导热性至关重要。现有研究探索了混合填料系统和氧化铝（Al2O3）颗粒表面改性，以提高聚合物复合材料的导热性。在本研究中，通过使用柠檬酸和葡萄糖对原始 Al2O3 表面进行改性，制造出了高酸性 Al2O3 填料；改性后的 Al2O3 以 80 wt.% 的浓度渗入未固化的环氧胶粘剂中。与未加工的 Al2O3 相比，在 25 °C 时，葡萄糖填充和柠檬酸填充的 Al2O3 所测得的复合材料热导率分别高出 19.4% 和 35.9%。实验分析和理论计算表明，表面的极性官能团促进了填料与环氧树脂之间的氢键结合，从而降低了复合材料的界面热阻；羧基的这种效应最大。为了证明该改性技术的实际应用，我们进行了放热性能测试，结果表明，与未涂覆 Al2O3 的复合材料相比，涂覆了柠檬酸填料的复合材料的发光二极管灯具有优异的热管理性能。图文摘要

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Macromolecular Research 工程技术-高分子科学

CiteScore

4.70

自引率

8.30%

发文量

100

审稿时长

1.3 months

期刊介绍： Original research on all aspects of polymer science, engineering and technology, including nanotechnology Presents original research articles on all aspects of polymer science, engineering and technology Coverage extends to such topics as nanotechnology, biotechnology and information technology The English-language journal of the Polymer Society of Korea Macromolecular Research is a scientific journal published monthly by the Polymer Society of Korea. Macromolecular Research publishes original researches on all aspects of polymer science, engineering, and technology as well as new emerging technologies using polymeric materials including nanotechnology, biotechnology, and information technology in forms of Articles, Communications, Notes, Reviews, and Feature articles.