Fe3O4@C磁场诱导自组装制备导热柔性液态硅橡胶复合材料,Journal of Applied Polymer Science

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Fe3O4@C磁场诱导自组装制备导热柔性液态硅橡胶复合材料
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-06-11 , DOI: 10.1002/app.52746
Chaoyu Wang ₁ , Zhi Hao ₁ , Zhu Luo ₁ , Le Yang ₂ , Qin Zhou ₁ , Jiaxing Guo ₁

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高效散热对于现代电子设备的性能、使用寿命和可靠性至关重要。通过创新的材料结构设计来提高散热效率非常具有挑战性。因此，在工作中，多巴胺（PDA）以其优异的表面包覆改性能力被用于包覆石墨（C）的表面，使C表面具有含氧基团改变其电负性，而Fe ²⁺和Fe溶液中的³⁺被吸引到C表面，然后在C表面发生原位氧化还原反应生成磁性石墨（Fe ₃ O ₄ @C）。铁₃ O ₄@C通过溶液共混均匀分散到液态硅橡胶（LSR）中，Fe ₃ O ₄ @C在磁场（B = 140 mT）的作用下在LSR中进行整体定向填充，从而制备Fe ₃ O ₄ @ C/LSR 复合材料。通过磁场取向，Fe ₃ O _{4 @C/LSR复合材料在Fe}₃ O ₄ @C含量为100 phr时的热导率达到1.25 W/m·K，比纯LSR高410%（ 0.2447 W/m·K)。红外热成像测试表明，Fe ₃ O ₄ @C/LSR复合材料具有良好的散热性能，Fe ₃O ₄ @C/LSR 复合材料在柔韧性和高导热性方面显示出巨大的潜力。

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Preparation of thermally conductive flexible liquid silicone rubber composites by magnetic field-induced self-assembly of Fe3O4@C

Efficient heat dissipation is very crucial for the performance, service life, and reliability of modern electronic devices. It is very challenging to improve heat dissipation efficiency through innovative material structure design. Therefore, in the work, dopamine (PDA) is used to coat the surface of graphite (C) with its excellent surface coating modification ability, so that the C surface has oxygen-containing groups to change its electronegativity, and Fe²⁺ and Fe³⁺ in the solution are attracted to the surface of C, and then in situ redox reaction occurs on the surface of C to generate magnetic graphite (Fe₃O₄@C). Fe₃O₄@C is uniformly dispersed into liquid silicone rubber (LSR) by solution blending, and Fe₃O₄@C performs integral directional filling in the LSR under the action of magnetic field (B = 140 mT), thus preparing Fe₃O₄@C/LSR composites. Through magnetic field orientation, the thermal conductivity of Fe₃O₄@C/LSR composites reach 1.25 W/m·K when the content of Fe₃O₄@C is 100 phr, which is 410% higher than that of pure LSR (0.2447 W/m·K). Infrared thermal imaging test shows that Fe₃O₄@C/LSR composites has good heat dissipation performance, Fe₃O₄@C/LSR composites have shown great potential in terms of flexibility and high thermal conductivity.

更新日期：2022-06-11

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