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首页> 外文期刊>RSC Advances >Polymer-based composites with improved energy density and dielectric constants by monoaxial hot-stretching for organic film capacitor applications
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Polymer-based composites with improved energy density and dielectric constants by monoaxial hot-stretching for organic film capacitor applications

机译：通过单轴热拉伸提高有机材料电容器应用的能量密度和介电常数的聚合物基复合材料

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摘要

Randomly oriented multiwalled carbon nanotube (MWCNT)/polyarylene ether nitrile (PEN) composite films were prepared by a solution casting method. The as-prepared films then underwent monoaxial hot-stretching in an oven to enhance their orientations and crystallinities. Results showed that the hot-stretching process enhanced the mechanical and thermal properties significantly. The development of electrical conducting pathways during the monoaxial hot-stretching of MWCNT/PEN composite films was studied. Since the amount of MWCNT filler is close to the percolation threshold, ca. 6 wt%, the dielectric properties, electrical conductivity, breakdown strength and energy density were found to be very sensitive to the stretch ratio. The electrical conductivity of composites with a 50% stretch ratio increased from 5.2 x 10 (5) S cm (1) to 1.6 x 10 (4) S cm (1) (1 kHz). Besides, the dielectric constant of composites with a 50% stretch ratio increases significantly from 378.0 to 1298.1 (100 Hz). Most importantly, the composites with a 50% stretch ratio compensate some dielectric constant with breakdown strength, and finally, the energy density of the composites with a 50% stretch ratio increases by about 40%, from 2.51 to 3.50 J cm(-3), and has huge potential to be used as organic film capacitors.
机译：通过溶液流延法制备了无规取向的多壁碳纳米管（MWCNT）/聚亚芳基醚腈（PEN）复合膜。然后将所制备的膜在烘箱中进行单轴热拉伸，以增强其取向和结晶度。结果表明，热拉伸过程显着提高了机械性能和热性能。研究了MWCNT / PEN复合膜单轴热拉伸过程中导电路径的发展。由于MWCNT填料的数量接近渗滤阈值，因此大约为。发现6重量％的介电性能，电导率，击穿强度和能量密度对拉伸比非常敏感。拉伸比为50％的复合材料的电导率从5.2 x 10（5）S cm（1）增加到1.6 x 10（4）S cm（1）（1 kHz）。此外，拉伸比为50％的复合材料的介电常数从378.0显着提高到1298.1（100 Hz）。最重要的是，拉伸比为50％的复合材料可通过击穿强度补偿某些介电常数，最后，拉伸比为50％的复合材料的能量密度从2.51到3.50 J cm（-3）增加约40％。 ，并且具有用作有机薄膜电容器的巨大潜力。

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