材料科学
母粒
集聚经济
碳纳米管
色散(光学)
聚碳酸酯
纳米管
复合材料
渗流阈值
紧迫的
混合(物理)
分散剂
渗透(认知心理学)
纳米复合材料
电阻率和电导率
化学工程
神经科学
量子力学
工程类
物理
光学
电气工程
生物
作者
Sven Pegel,Petra Pötschke,Gudrun Petzold,Ingo Alig,Sergej M. Dudkin,Dirk Lellinger
出处
期刊:Polymer
[Elsevier]
日期:2008-02-01
卷期号:49 (4): 974-984
被引量:348
标识
DOI:10.1016/j.polymer.2007.12.024
摘要
Three different industrially available multiwalled carbon nanotube (MWNT) materials were directly incorporated into polycarbonate by melt mixing using a small-scale compounder. Despite of similar aspect ratios the electrical percolation behaviour was different. TEM investigations reveal significant differences in the nanotube dispersion which can be attributed to different dispersability of the raw MWNT materials. It is shown that the investigation of the sedimentation behaviour of aqueous MWNT dispersions is a simple method to estimate the nanotube dispersability. The relationships between melt processing conditions and MWNT dispersion and distribution were studied on polycarbonate samples containing 0.875 wt% MWNT prepared by masterbatch dilution. During melt mixing only high shear forces can provide suitable MWNT dispersion because firstly the MWNT disentanglement is facilitated and secondly secondary agglomeration is prevented. At low shear agglomeration of formerly well dispersed MWNT could be observed. During hot pressing the network or MWNT arrangement and the resulting electrical conductivity can be manipulated by the processing conditions like melt temperature and pressing speed. A certain nanotube agglomeration can enhance the development of an electrical percolated network as shown by dielectric spectroscopy.
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