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Surface modification and magnetic alignment of hexagonal boron nitride nanosheets for highly thermally conductive composites

机译：高热导电复合材料的六角形氮化物纳米片的表面改性和磁对准

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摘要

With the current development of microelectronic technology, thermally conductive and electrically insulating encapsulation materials are in urgent demand. Hexagonal boron nitride nanosheets (BNNSs) possess a highly anisotropic thermal property. Therefore, the thermal conductivity of the BNNSs-based composites can be dramatically increased through the orientation of fillers. However, it is still difficult to well align BNNSs at high loadings due to the intensive aggregation. Herein, highly ordered thermoplastic polyurethane elastomer (TPU)/BNNSs composites are successfully fabricated by the combination of filler modification and magnetic alignment. The effective covalent modification with 2,4-tolylene diisocyanate (TDI) greatly increases the dispersibility of fillers, thus making it easy to well orient BNNSs at high loadings. The highly aligned fillers result in much higher in-plane thermal conductivity than the composites filled with disordered or less-ordered unmodified BNNSs. The thermal conductivity is as high as 5.15 W m(-1) K-1 at 30 wt% loading. Moreover, the composite simultaneously exhibits low dielectric constant, low dielectric dissipation factor and excellent thermomechanical properties. These results reveal the promising application of such highly-ordered composites in advanced electronic packing.
机译：随着微电子技术的目前的发展，导热和电绝缘封装材料紧急需求。六边形氮化物纳米片（BNNS）具有高度各向异性的热性能。因此，通过填料的取向可以显着增加基于BNNS的复合材料的导热率。然而，由于强化聚集，仍然难以使BNNS在高负载下对齐。这里，通过填充改性和磁对准的组合成功地制造了高度有序的热塑性聚氨酯弹性体（TPU）/ BNNSS复合材料。用2,4-甲苯二异氰酸酯（TDI）的有效共价修饰大大增加了填料的分散性，从而使其在高负荷下易于定向BNNS。高度对准的填充剂比填充有无序或较少订购的未改性的BNNSS的复合材料导致更高的面内导热率。导热率高达5.15Wm（-1）k-1，在30wt％负载下。此外，复合材料同时表现出低介电常数，低介电耗散因子和优异的热机械性能。这些结果揭示了在先进的电子包装中使用这种高度有序复合材料的希望应用。

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  • 来源
    《RSC Advances》 |2017年第69期|共10页
  • 作者

    Yuan Feng; Jiao Weicheng; Yang Fan; Liu Wenbo; Xu Zhonghai; Wang Rongguo;

  • 作者单位

    Harbin Inst Technol Sci &

    Technol Adv Composites Special Environm Lab Harbin 150086 Heilongjiang Peoples R China;

    Harbin Inst Technol Sci &

    Technol Adv Composites Special Environm Lab Harbin 150086 Heilongjiang Peoples R China;

    Harbin Inst Technol Sci &

    Technol Adv Composites Special Environm Lab Harbin 150086 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Mat Sci &

    Engn Harbin 150001 Heilongjiang Peoples R China;

    Harbin Inst Technol Sci &

    Technol Adv Composites Special Environm Lab Harbin 150086 Heilongjiang Peoples R China;

    Harbin Inst Technol Sci &

    Technol Adv Composites Special Environm Lab Harbin 150086 Heilongjiang Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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