Preparation of highly thermally conductive but electrically insulating composites by constructing a segregated double network in polymer composites
Preparation of highly thermally conductive but electrically insulating composites by constructing a segregated double network in polymer composites
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在聚合物复合材料中构建隔离双网络制备高导热电绝缘复合材料
DOI：
10.1016/j.compscitech.2019.03.017
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发表时间：
2019-05
影响因子：
9.1
通讯作者：
Fu Qiang
中科院分区：
文献类型：
--
作者：
Zhang Xiang;Wu Kai;Liu Yuhang;Yu Bowen;Zhang Qin;Chen Feng;Fu Qiang
导热但电绝缘的聚合物复合材料在热管理、电子封装等各种应用中引起了广泛关注。本文报道了一种制备兼具优异导热性和电绝缘性的聚合物复合材料的简便方法。为此，首先通过熔融共混制备尼龙6（PA6）/石墨烯纳米片（GNPs）复合材料，然后粉碎成微米颗粒并通过VAE树脂涂覆六方氮化硼（h-BN）粉末，最后热压成型形成复合材料。因此，根据PA6颗粒内部GNP的含量和颗粒上包覆的hBN的含量，可以很好地控制复合材料的导热性和导电性。例如，当填料总含量为18.82 vol%，PA颗粒内部含有1.97 vol% GNPs，表面涂覆16.85 vol% h-BN时，导热系数提高了近十倍（从0.29 W m(-1)k(-1)到2.69 W m(-1)k(-1)），同时仍保持优异的电绝缘性（低至4.13 x 10(-9)S/m)。据认为，这种双偏析填料网络可以协同增强导热性，而 GNP 引起的电导率可以在很大程度上被 h-BN 填料网络切断。更重要的是，即使在样品厚度减小为薄膜后，这种独特的结构也能得到很好的保留，从而导致流动方向的导热系数进一步增加（高达8.96 W·m(-1)k(-1)）。由于可以选择各种热塑性聚合物作为基体，并且可以采用不同的填料组合来构建导热协同和电绝缘，我们相信这项工作提供了一种制备具有低电导率的高导热复合材料的表面方法。
Thermally conductive but electrically insulating polymer composites have drawn much attention in various applications including thermal management, electronic packing, etc. Herein, a facile method of preparing polymer composites with both excellent thermal conductivity and electrical insulation is reported. To do this, nylon 6 (PA6)/Graphene nanoplatelets (GNPs) composites were firstly prepared via melt blending, then smashed into micron particles and coated with hexagonal boron nitride (h-BN) powder via VAE resin, finally hot compress molding to form composites. Thus depending on the content of GNPs inside PA6 particles and the content of hBN coated on the particles, the thermal and electrical conductivity of the composites could be well controlled. For instance, at the total content of fillers is 18.82 vol%, with 1.97 vol% GNPs insides PA particles and 16.85 vol % h-BN coated on the surface, almost ten times improvement of thermal conductivity (from 0.29 to 2.69 W m(-1)k(-1)) has been achieved, while still maintain an excellent electrical insulating (as low as 4.13 x 10(-9)S/m). It is proposed that this double segregated filler network could provide synergistic enhancement for the thermal conductivity, while the electrical conductivity caused by GNPs could be largely cut off by h-BN filler network. More importantly, this unique structure could be well preserved even after the sample thickness was decreased into a thin film, resulting in a further increase of thermal conductivity (up to 8.96 W m(-1)k(-1)) in the flow direction. Since various thermoplastic polymers can be chosen as matrix, and different filler combination can be adopted to construct thermal conductive synergistic and electrical insulating, we believe that this work provides a facial method to fabricate highly thermally conductive composites with a low electrical conductivity.
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影响因子：
--
作者：
Jie Yang;Guo-Qiang Qi;Li-Sheng Tang;Rui‐Ying Bao;L. Bai;Zhengying Liu;Wei Yang;Bang-hu Xie
通讯作者：
Jie Yang;Guo-Qiang Qi;Li-Sheng Tang;Rui‐Ying Bao;L. Bai;Zhengying Liu;Wei Yang;Bang-hu Xie
DOI：
10.1016/j.compositesa.2017.03.033
发表时间：
2017-08
影响因子：
8.7
作者：
Zheng Su;Hua Wang;X. Ye;Konghu Tian;Weiqi Huang;Chao Xiao;Xingyou Tian
通讯作者：
Zheng Su;Hua Wang;X. Ye;Konghu Tian;Weiqi Huang;Chao Xiao;Xingyou Tian
影响因子：
9.1
作者：
Feng, Chang-Ping;Wan, Shen-Shen;Yang, Wei
通讯作者：
Yang, Wei
影响因子：
3.9
作者：
Ohashi, M;Kawakami, S;Lai, GC
通讯作者：
Lai, GC
影响因子：
9.5
作者：
Jiang, Hongbo;Wang, Zifeng;Zhi, Chunyi
通讯作者：
Zhi, Chunyi