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首页> 外文期刊>Journal of Applied Polymer Science >Electrical, Mechanical, and Crystallization Properties of Ethylene-Tetrafluoroethylene Copolymer/Multiwalled Carbon Nanotube Composites
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Electrical, Mechanical, and Crystallization Properties of Ethylene-Tetrafluoroethylene Copolymer/Multiwalled Carbon Nanotube Composites

机译：乙烯-四氟乙烯共聚物/多壁碳纳米管复合材料的电，机械和结晶性能

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摘要

Multiwalled carbon nanotubes (MWCNTs) were melt-mixed in a conical twin-screw extruder with a random copolymer of ethylene and tetrafluoroethylene. Surprisingly, the electrical percolation threshold of the resultant composites was quite low; ~0.9 wt %. In fact, this value is as low or lower than the value for most MWCNT/semicrystalline polymer composites made with roughly equivalent aspect ratio tubes mixed in a similar manner, for example, melt mixing. This low percolation threshold, suggestive of good dispersion, occurred even though the polymer surface energy is quite low which should make tubes more difficult to disperse. Dynamic mechanical measurements confirmed the rather low percolation threshold. The effect of nanotubes on crystallization kinetics was quite small; suggesting perhaps that a lack of nucleation which in turn reduces/eliminates an insulating crystalline polymer layer around the nanotubes might explain the low percolation threshold. Finally, the modulus increased with the addition of nanotubes and the strain at break decreased.
机译：将多壁碳纳米管（MWCNT）在锥形双螺杆挤出机中与乙烯和四氟乙烯的无规共聚物熔融混合。出人意料的是，所得复合材料的电渗透阈值很低。约0.9重量％。实际上，该值与以相似的方式，例如熔融混合，以大致相等的长径比管制成的大多数MWCNT /半结晶聚合物复合物的值一样低或更低。即使聚合物表面能非常低，也会出现暗示良好分散的低渗透阈值，这会使管子更难分散。动态机械测量结果证实了较低的渗滤阈值。纳米管对结晶动力学的影响很小。这表明也许缺乏成核作用反过来会减少/消除纳米管周围的绝缘结晶聚合物层，这可能解释了低渗透阈值。最后，模量随着纳米管的添加而增加，并且断裂应变降低。

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