Carboxylated multi-walled carbon nanotubes (MWCNTs−COOH) were selected as the carrier and polypyrrole (PPy) as functional agent to synthesize PPy/MWCNTs dielectric nanofillers via FeCl₃ oxidative polymerization of pyrrole (Py) on the surface of MWCNTs−COOHs, and then poly(vinylidene fluoride) based dielectric nanocomposites (PPy/MWCNTs/PVDF) were fabricated by direct melting blending. The effects of the PPy/MWCNTs dielectric nanofillers on the changes of phase behaviors and the mechanical, thermal and dielectric properties of the PPy/MWCNTs/PVDF dielectric nanocomposites were investigated. The results indicated that PPy/MWCNTs/PVDF dielectric nanocomposites showed higher mechanical strength within a certain range of PPy/MWCNTs nanofillers content. When the PPy/MWCNTs content was 10 wt.%, the tensile strength and elastic modulus of the nanocomposites reached 60.2 MPa and 610 MPa respectively, which increased by 24 % and 75 %, in contrast to those of MWCNT−COOH/PVDF dielectric nanocomposites. Dielectric properties tests revealed that the introduction of PPy induced the formation conductive networks and β-type PVDF, and thus enhancing the dielectric constant. the resultant PPy/MWCNTs/PVDF dielectric nanocomposites reached the percolation threshold at the PPy/MWCNTs content of 12 wt.%. The corresponding dielectric constant reached 83, which was 10 times of pure PVDF. Meanwhile, the dielectric constant was also much higher than MWCNTs−COOH/PVDF. Differential scanning calorimeter (DSC) found that the melting and crystallization temperatures of the two nanocomposites were greatly improved compared with pure PVDF, indicating that the addition of dielectric nanofiller improved the thermal property of the nanocomposites.

选择羧化多壁碳纳米管（MWCNTs-COOH）为载体，聚吡咯（PPy）为功能剂，通过FeCl ₃合成PPy / MWCNTs介电纳米填料通过吡咯（Py）在MWCNTs-COOHs表面的氧化聚合，然后通过直接熔融共混制备聚偏二氟乙烯基介电纳米复合材料（PPy / MWCNTs / PVDF）。研究了PPy / MWCNTs介电纳米填料对相行为变化以及PPy / MWCNTs / PVDF介电纳米复合材料的机械，热和介电性能的影响。结果表明，在一定的PPy / MWCNTs纳米填料含量范围内，PPy / MWCNTs / PVDF介电纳米复合材料具有较高的机械强度。当PPy / MWCNTs含量为10 wt。％时，纳米复合材料的拉伸强度和弹性模量分别达到60.2 MPa和610 MPa，与MWCNT-COOH / PVDF介电纳米复合材料相比，分别增加了24％和75％。 。β型PVDF，从而提高介电常数。所得的PPy / MWCNTs / PVDF介电纳米复合材料在PPy / MWCNTs含量为12 wt。％时达到了渗滤阈值。相应的介电常数达到83，是纯PVDF的10倍。同时，介电常数也远高于MWCNTs-COOH / PVDF。差示扫描量热仪（DSC）发现，与纯PVDF相比，两种纳米复合材料的熔融和结晶温度得到了极大的改善，表明添加电介质纳米填料改善了纳米复合材料的热性能。