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Multilayered ultrahigh molecular weight polyethylene/natural graphite/boron nitride composites with enhanced thermal conductivity and electrical insulation by hot compression
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-10-02 , DOI: 10.1002/app.49938 Xiao Wang 1 , Chang‐Ping Feng 1 , Min Wang 1 , Hui Lu 1 , Hai‐Ying Ni 1 , Jun Chen 1
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-10-02 , DOI: 10.1002/app.49938 Xiao Wang 1 , Chang‐Ping Feng 1 , Min Wang 1 , Hui Lu 1 , Hai‐Ying Ni 1 , Jun Chen 1
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A scalable strategy to fabricate thermally conductive but electrically insulating polymer composites was urgently required in various applications including heat exchangers and electronic packages. In this work, multilayered ultrahigh molecular weight polyethylene (UHMWPE)/natural graphite (NG)/boron nitride (BN) composites were prepared by hot compressing the UHMWPE/NG layers and UHMWPE/BN layers alternately. Taking advantage of the internal properties of NG and BN fillers, the UHMWPE/NG layers played a decisive role in enhancing thermal conductivity (TC), while the UHMWPE/BN layers effectively blocked the electrically conductive pathways without affecting the thermal conductive pathways. The in‐plane TC, electrical insulation, and heat spreading ability of multilayered UHMWPE/NG/BN composites increased with the increasing layer numbers. At the total fillers loading of 40 wt%, the in‐plane TC of multilayered UHMWPE/NG/BN composites with nine layers was markedly improved to 6.319 Wm−1 K−1, outperforming UHMWPE/BN (4.735 Wm−1 K−1) and pure UHMWPE (0.305 Wm−1 K−1) by 33.45% and 1971.80%, respectively. Meanwhile, the UHMWPE/NG/BN composites still maintained an excellent electrically insulating property (volume resistance~5.40×1014 Ω cm; breakdown voltage~1.52 kV/mm). Moreover, the multilayered UHMWPE/NG/BN composites also exhibited surpassing heat dissipation capability and mechanical properties. Our results provided an effective method to fabricate highly thermal conductive and electrical insulating composites.
中文翻译：
多层超高分子量聚乙烯/天然石墨/氮化硼复合材料，具有增强的导热性和通过热压缩实现电绝缘
在包括热交换器和电子封装在内的各种应用中，迫切需要一种可扩展的策略来制造导热但电绝缘的聚合物复合材料。在这项工作中，通过交替热压UHMWPE / NG层和UHMWPE / BN层，制备了多层超高分子量聚乙烯（UHMWPE）/天然石墨（NG）/氮化硼（BN）复合材料。利用NG和BN填料的内部特性，UHMWPE / NG层在增强热导率（TC）方面起着决定性的作用，而UHMWPE / BN层有效地阻止了导电路径，而不会影响导热路径。多层UHMWPE / NG / BN复合材料的面内TC，电绝缘和散热能力随层数的增加而增加。-1 K -1，分别比UHMWPE / BN（4.735 Wm -1 K -1）和纯UHMWPE（0.305 Wm -1 K -1）分别高33.45％和1971.80％。同时，UHMWPE / NG / BN复合材料仍保持优异的电绝缘性能（体积电阻率〜5.40 ×10 14 Ω厘米;击穿电压〜1.52千伏/毫米）。此外，多层的UHMWPE / NG / BN复合材料还表现出超越的散热能力和机械性能。我们的结果提供了一种制造高导热和电绝缘复合材料的有效方法。
更新日期：2020-11-25
中文翻译：
多层超高分子量聚乙烯/天然石墨/氮化硼复合材料，具有增强的导热性和通过热压缩实现电绝缘
在包括热交换器和电子封装在内的各种应用中，迫切需要一种可扩展的策略来制造导热但电绝缘的聚合物复合材料。在这项工作中，通过交替热压UHMWPE / NG层和UHMWPE / BN层，制备了多层超高分子量聚乙烯（UHMWPE）/天然石墨（NG）/氮化硼（BN）复合材料。利用NG和BN填料的内部特性，UHMWPE / NG层在增强热导率（TC）方面起着决定性的作用，而UHMWPE / BN层有效地阻止了导电路径，而不会影响导热路径。多层UHMWPE / NG / BN复合材料的面内TC，电绝缘和散热能力随层数的增加而增加。-1 K -1，分别比UHMWPE / BN（4.735 Wm -1 K -1）和纯UHMWPE（0.305 Wm -1 K -1）分别高33.45％和1971.80％。同时，UHMWPE / NG / BN复合材料仍保持优异的电绝缘性能（体积电阻率〜5.40 ×10 14 Ω厘米;击穿电压〜1.52千伏/毫米）。此外，多层的UHMWPE / NG / BN复合材料还表现出超越的散热能力和机械性能。我们的结果提供了一种制造高导热和电绝缘复合材料的有效方法。
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