Investigation of the rheological and conductive properties of multi-walled carbon nanotube/polycarbonate composites by positron annihilation techniques
Investigation of the rheological and conductive properties of multi-walled carbon nanotube/polycarbonate composites by positron annihilation techniques
复制标题
正电子湮没技术研究多壁碳纳米管/聚碳酸酯复合材料的流变和导电性能
DOI：
10.1016/j.carbon.2012.02.059
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发表时间：
2012-07
期刊：
影响因子：
10.9
通讯作者：
王波
中科院分区：
文献类型：
--
作者：
王波
采用正电子湮没寿命谱、正电子湮没符合多普勒展宽（CDB）、振荡流变仪和电阻率等方法研究了不同多壁碳纳米管（MWCNT）含量的MWCNT/聚碳酸酯（PC）复合材料的微观结构、流变和导电性能。一个10个数量级的电导率增加，实现了非常少量的多壁碳纳米管。CDB被用来确定渗流阈值，这是在良好的协议与电导率和流变测量。结果表明，随着MWCNT含量的增加，复合材料在室温下发生了由绝缘到导电的相变，这归因于MWCNT网络的形成。通过正电子湮没寿命测量研究了MMCNTs对MWCNT/PC复合材料微观结构的影响。结果表明，MWCNTs的加入和导电网络的形成使自由体积分数减小。讨论了MWCNT填料对MWCNT/PC复合材料原子尺度自由体积和力学性能的影响。
The microstructure, rheological and conductive properties of multi-walled carbon nanotube (MWCNT)/polycarbonate (PC) composites were investigated by positron annihilation lifetime spectroscopy, positron annihilation coincidence Doppler broadening (CDB), oscillatory rheometry and electrical resistivity for different MWCNT contents. A 10 orders of magnitude increase in electrical conductivity was achieved with very small quantities of MWCNTs. CDB was used to determine a percolation threshold value, which was in good agreement with the electrical conductivity and rheological measurements. The results showed that with increasing MWCNT content, the composites underwent a phase transition from insulating to conducting at room temperature, which was attributed to the formation of a MWCNT network. The effect of MMCNTs on the microstructure of MWCNT/PC composites has been studied by positron annihilation lifetime measurements. The results showed that the fractional free volume decreased because of the MWCNTs and the formation of conductive network. The effects of MWCNT filler on the atomic scale free volume and mechanical property of MWCNT/PC composites were also discussed.
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影响因子：
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