Functionalization of Graphene Nanosheets-3D Printing Resins for Improvement of Mechanical Properties and Thermal Conductivity

IF 4.4 2区化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Polymer Materials Pub Date : 2024-09-12 DOI:10.1021/acsapm.4c02181

Kuan-Syun Wang, Yao-Sheng Zhang, Wei-Han Lo, Chin-Ching Lin, Cheng-Chen Chen, Jen-Hung Fang, Ting-Yu Liu

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Abstract

In this study, a photocurable 3D printer was utilized to fabricate soft thermal interface materials (TIMs) with enhanced thermal conductivity and mechanical properties. Graphene oxide (GO) nanosheets were oxidized from graphite and subsequently grafted with poly(ethylene glycol) methacrylate (PEGMA) at the edges, resulting in a material named GO-MA. GO-MA was blended with the 4-hydroxybutyl acrylate (4-HBA) monomer and polymerized using a photoinitiator, phenylbis(2,4,6-trimethylbenzoyl) phosphine oxide, to form nanocomposites. The van der Waals force interaction between GO sheets makes it easy for GO to aggregate. The modification of GO with PEGMA can effectively disperse GO in the monomer, preventing aggregation. The modified GO-MA forms a highly interconnected network within the polymer matrix, facilitating heat dissipation by providing multiple pathways for heat transfer. Thermal conductivity and mechanical properties of the nanocomposites were investigated. A 3D-printed nanocomposite containing 40 wt % GO-MA in 4-HBA exhibited a thermal conductivity that was 5.8 times higher than that of pristine 4-HBA, along with a 4.2-fold enhancement in mechanical properties. These results demonstrate that the proposed method is a promising approach for fabricating soft TIMs with enhanced thermal conductivity and mechanical properties. The increased thermal conductivity is attributed to the high thermal conductivity of GO and the highly interconnected network formed by GO-MA. The improved mechanical properties result from the strong interfacial bonding between GO-MA and the polymer matrix.

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功能化石墨烯纳米片-3D 印刷树脂以改善机械性能和导热性能

本研究利用光固化三维打印机制造了具有更强导热性和机械性能的软导热界面材料（TIM）。从石墨中氧化出氧化石墨烯（GO）纳米片，然后在边缘接枝聚（乙二醇）甲基丙烯酸酯（PEGMA），得到一种名为 GO-MA 的材料。GO-MA 与 4-羟基丁基丙烯酸酯（4-HBA）单体混合，并使用光引发剂苯基双（2,4,6-三甲基苯甲酰基）氧化膦进行聚合，形成纳米复合材料。GO 片之间的范德华力相互作用使 GO 易于聚集。用 PEGMA 修饰 GO 可以有效地将 GO 分散在单体中，防止聚集。改性后的 GO-MA 在聚合物基体中形成了一个高度相互连接的网络，通过提供多种热传导途径来促进散热。对纳米复合材料的导热性和机械性能进行了研究。在 4-HBA 中含有 40 wt % GO-MA 的三维打印纳米复合材料的热导率是原始 4-HBA 的 5.8 倍，机械性能也提高了 4.2 倍。这些结果表明，所提出的方法是制造具有更高热导率和机械性能的软 TIM 的可行方法。热导率的提高归功于 GO 的高热导率和 GO-MA 形成的高度互连网络。GO-MA与聚合物基体之间的强界面粘合力提高了机械性能。

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来源期刊

ACS Applied Polymer Materials Multiple-

CiteScore

7.20

自引率

6.00%

发文量

810

期刊介绍： ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.

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