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首页> 外文期刊>Physica status solidi, B. Basic research >Spatial decorrelation of the conductive nanotube network in a polymer melt
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Spatial decorrelation of the conductive nanotube network in a polymer melt

机译：聚合物熔体中导电纳米管网络的空间去相关

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摘要

Time resolved electrical conductivities of a polycarbonate (PC) composite melt filled with multiwalled carbon nanotubes (MWNTs) were measured in a rheometer equipped with ring electrodes. Strain was applied to the melt in trapezoidal shape, i.e., as a first positive shear pulse, followed by a pause of varying duration, and finally a negative shear pulse was applied. It is well known that applying shear to a conductive melt containing nanotubes causes a conductivity decrease due to the destruction of the nanotube network during shear. This effect should be independent on the direction of shear. However, if there was only a short pause between positive and negative shear pulses, one observes an increase of conductivity during the negative shear pulse. For longer pauses, this effect diminishes, and finally, the expected conductivity decrease can be seen. The effect will be explained by the spatial de-correlation of the nanotubes related to their agglomeration in the melt during the pause. Normalized conductivity of polycarbonate melt with MWNT during the negative shear pulse for varying duration of the pause between positive and negative shear.
机译：在配备有环形电极的流变仪中测量填充有多壁碳纳米管（MWNT）的聚碳酸酯（PC）复合熔体的时间分辨电导率。将应变以梯形形状施加到熔体上，即作为第一正剪切脉冲，随后是变化持续时间的停顿，最后施加负剪切脉冲。众所周知，由于在剪切过程中纳米管网络的破坏，对包含纳米管的导电熔体施加剪切力会导致电导率下降。该效果应与剪切方向无关。但是，如果在正和负剪切脉冲之间只有短暂的停顿，则可以观察到在负剪切脉冲期间电导率增加。对于更长的停顿，此效果会减弱，最后可以看到预期的电导率下降。将通过在暂停过程中纳米管与其在熔体中的团聚有关的空间去相关性来解释这种影响。在负剪切脉冲期间，随着正剪切和负剪切之间的暂停时间变化，聚碳酸酯熔体与MWNT的标准化电导率。

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