Wu Lirong, Yang Dandan
School of Environmental and Materials Engineering, Shanghai Polytechnic University, Pudong, Shanghai 201209, P. R. China.
J Nanosci Nanotechnol. 2019 Jun 1;19(6):3591-3596. doi: 10.1166/jnn.2019.16137.
The nickel (Ni) particles and graphite nanosheet (GNS) filled poly(vinylidene fluoride) (PVDF) composites were prepared by solution blending and hot-press processing in the magnetic field. The influence of Ni particles and GNS fillers for the structure, morphology, AC conductivity, dielectric properties and thermal conductivity of composites was investigated. The results showed that the -phase crystals of PVDF matrix was increased obviously. The AC conductivity, dielectric constant and dielectric loss of PVDF/Ni/GNS composite reached to 10 s/cm, 62 and 0.39 when the filler loading was 11 wt.% at 102 Hz, respectively. At the ratio of 15 wt.% filler, the AC conductivity of PVDF/Ni/GNS composite was vastly improved to 10 s/cm, however, the dielectric constant increased to ~80 and dielectric loss was over 600 at 10² Hz. By comparing the dielectric performance of PVDF/Ni/GNS, PVDF/Ni and PVDF/GNS composites, it is found that the parallel arrangement of the filler conduces to improve the dielectric properties of the composites. Furthermore, the thermal conductivity of PVDF/Ni/GNS composites increased with the increase of Ni and GNS contents and the value raised to over 0.5 W/mK when filler loading was 15 wt.%.
通过溶液共混和在磁场中热压处理制备了镍（Ni）颗粒和石墨纳米片（GNS）填充的聚偏氟乙烯（PVDF）复合材料。研究了Ni颗粒和GNS填料对复合材料的结构、形态、交流电导率、介电性能和热导率的影响。结果表明，PVDF基体的β相晶体明显增加。当填料含量为11 wt.% 时，PVDF/Ni/GNS复合材料在102 Hz下的交流电导率、介电常数和介电损耗分别达到10 s/cm、62和0.39。在填料比例为15 wt.% 时，PVDF/Ni/GNS复合材料的交流电导率大幅提高到10 s/cm，然而，在10² Hz下介电常数增加到~80，介电损耗超过600。通过比较PVDF/Ni/GNS、PVDF/Ni和PVDF/GNS复合材料的介电性能，发现填料的平行排列有助于提高复合材料的介电性能。此外，PVDF/Ni/GNS复合材料的热导率随着Ni和GNS含量的增加而增加，当填料含量为15 wt.% 时，该值提高到超过0.5 W/mK。
