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首页> 外文期刊>Journal of Applied Polymer Science >Improved dielectric performance of polypropylene/ multiwalled carbon nanotube nanocomposites by solid-phase orientation
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Improved dielectric performance of polypropylene/ multiwalled carbon nanotube nanocomposites by solid-phase orientation

机译：通过固相取向改善聚丙烯/多壁碳纳米管纳米复合材料的介电性能

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摘要

By means of a die-drawing technique in the rubbery state, the effect of the orientation of the microstructure on the dielectric properties of polypropylene (PP)/multiwalled carbon nanotube (MWCNT) nanocomposites was examined in this study. The viscoelastic behavior of the PP/MWCNT nanocomposites with MWCNT weight loadings ranging from 0.25 to 5 wt % and the dielectric performance of the stretched PP/MWCNT nanocomposites at different drawing speeds and drawing ratios were studied to obtain insight into the influences of the dispersion and orientation state of the MWCNTs and matrix molecular chains. A viscosity decrease (ca. 30%) of the PP/MWCNT-0.25 wt % (weight loading) melt was obviously due to the free volume effect. Differential scanning calorimetry (DSC) and wide-angle X-ray diffraction were adopted to detect the orientation structure and the variation of crystal morphology of the PP/MWCNTs. Melting plateau regions, which indicated the mixed crystallization morphology for the stretched samples, were found in the DSC patterns instead of a single-peak for the unstretched samples. We found that the uniaxial stretching process broke the conductive MWCNT networks and consequently increased the orientation of MWCNTs and molecular chains along the tensile force direction; this led to an improvement in the dielectric performance. (C) 2015 Wiley Periodicals, Inc.
机译：通过在橡胶态的拉丝技术，研究了微观结构的取向对聚丙烯（PP）/多壁碳纳米管（MWCNT）纳米复合材料介电性能的影响。研究了MWCNT重量载荷为0.25至5 wt％的PP / MWCNT纳米复合材料的粘弹性行为以及拉伸后的PP / MWCNT纳米复合材料在不同拉伸速度和拉伸比下的介电性能，从而了解了分散度和MWCNT和基质分子链的取向状态。 PP / MWCNT-0.25 wt％（重量负载）熔体的粘度降低（约30％）显然是由于自由体积效应造成的。采用差示扫描量热法（DSC）和广角X射线衍射检测PP / MWCNTs的取向结构和晶体形态的变化。在DSC模式中发现了熔融高原区域，该区域表示拉伸样品的混合结晶形态，而不是未拉伸样品的单峰。我们发现单轴拉伸过程破坏了导电的MWCNT网络，并因此增加了MWCNTs和分子链沿拉力方向的取向。这导致介电性能的改善。 （C）2015年Wiley Periodicals，Inc.

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