Influence of the injection moulding conditions on the in‐line measured electrical conductivity of polymer–carbon nanotube composites
Influence of the injection moulding conditions on the in‐line measured electrical conductivity of polymer–carbon nanotube composites
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DOI：
10.1002/pssb.200879619
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发表时间：
2008-10
期刊：
影响因子：
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通讯作者：
D. Lellinger;Donghua Xu;A. Ohneiser;Tetyana Skipa;I. Alig
中科院分区：
文献类型：
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作者：
D. Lellinger;Donghua Xu;A. Ohneiser;Tetyana Skipa;I. Alig
在注射成型机中在线测量了聚碳酸酯-聚酰胺-多壁碳纳米管复合材料的时间分辨电导率。在注塑周期的最初几秒钟，电导率随着熔体温度和压力的变化而变化，但随后几秒钟几乎保持不变，直到部件玻璃化并断开电导率传感器。从恒定电导率的时间剖面中提取的电导率值显示了不同的注射成型条件：注射速度、熔体温度和模具温度的依赖性。结果表明，电导率仅因加工参数的微小变化而变化7个数量级。注射速度和熔体温度的影响最大，而模具温度的影响较小。将在线测量值与离线测量的电导率值进行了比较，发现了良好的相关性。观察到的电导率行为在导电碳纳米管网络的破坏/重建框架中得到解释，其中实际的破坏状态受到玻璃化和结晶的阻碍。（©2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim）
Time resolved electrical conductivities of polycarbonate‐ and polyamide‐multiwalled carbon nanotube composites were measured inline in an injection moulding machine. During the first few seconds of an injection moulding cycle, the electrical conductivity varies with melt temperature and pressure, but then stays nearly constant for some seconds, until the part vitrifies and breaks off of the conductivity sensor. The conductivity values extracted from the time section of constant conductivity are shown in dependence of different injection moulding conditions: injection velocity, melt temperature and mould temperature. It turns out that the conductivity varied by 7 orders of magnitude by only small variations of the processing parameters. Injection velocity and melt temperature showed the largest influence, whereas the mould temperature has only minor importance. The inline measured values were compared to offline measured conductivity values, and good correlation was found. The observed behaviour of the electrical conductivity is explained in the framework of destruction/rebuilding of a conductive carbon nanotube network, where the actual state of destruction is frustrated by vitrification and crystallization. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)