Synergistic effect of conductive carbon black and silica particles for improving the pyroresistive properties of high density polyethylene composites
Synergistic effect of conductive carbon black and silica particles for improving the pyroresistive properties of high density polyethylene composites
复制标题
导电炭黑和二氧化硅颗粒对提高高密度聚乙烯复合材料耐热性能的协同作用
DOI：
10.1016/j.compositesb.2019.107465
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发表时间：
2019-12-01
影响因子：
13.1
通讯作者：
Zhang, Jianming
中科院分区：
文献类型：
--
作者：
Chen, Long;Hou, Jiarui;Zhang, Jianming
正温度系数（PTC）导电高分子复合材料（CPC）组装而成的智能加热装置，因其优异的自调节性能，在汽车、航天器、智能建筑等领域得到了广泛的应用。不幸的是，CPC固有的缺点，如电阻不稳定和PTC再现性差，极大地限制了智能加热器的繁荣。本文提出了在导电炭黑（CB）/高密度聚乙烯（HDPE）复合材料中掺杂SiO2纳米粒子来提高复合材料PTC综合性能的一种简单有效的方法。导电炭黑和二氧化硅的协同效应，证明了通过同时增强的导电性，电阻稳定性和PTC重现性的二氧化硅/CB/HDPE复合材料，已被证明为二氧化硅的含量达到3.0体积%时，CB负载量刚刚超过其逾渗阈值。我们的形态学研究表明，这种效果是由于改善分散的CB与二氧化硅颗粒的插层。这为制备高性能的自调节发热材料提供了一种简便、低成本的方法。
Smart heating devices, assembled by the conductive polymer composites (CPCs) with positive temperature coefficient (PTC), have been wildly used in automobile, spacecraft, smart building, due to their outstanding self-regulating performances. Unfortunately, the intrinsic drawbacks of CPCs such as resistance instability and poor PTC reproducibility vastly restrict the prosperity of smart heaters. Herein, a facile and valid strategy based on doping silica nanoparticles in conductive carbon black (CB)/high density polyethylene (HDPE) composites is proposed to enhance the comprehensive PTC properties. The synergistic effect of conductive CB and silica, evidenced by the simultaneously enhancement of the conductivity, resistance stability and PTC reproducibility of Silica/CB/HDPE composites, has been demonstrated as the content of silica reaching 3.0 vol % when CB loading is just above its percolation threshold. Our morphology studies suggest that this effect is attributed to the improved dispersion of CB with the intercalation of silica particles. It is believed that this work offers a facile and low cost method for fabrication of high-performance self-regulated heating material.