石墨烯纳米片(GNP)对聚苯乙烯(PS)/聚偏二氟乙烯(PVDF)共混物介电性能和热性能的影响

N. Kumar, V. Ravibabu, A. Ashokbabu, P. Thomas
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引用次数: 1

摘要

聚合物薄膜具有击穿强度高、稳定性好、经济可行等特点,在电容器技术的发展中具有重要意义。聚合物介电常数低的缺点可以通过掺入各种填料来克服。在本研究中,制备了含有50体积百分比(vol%)聚偏二氟乙烯(PVDF)的聚苯乙烯(PS)共混物,并在共混物中加入不同重量百分比(0 ~ 15 wt%)的石墨烯纳米片(GNP),制备了PS/PVDF/GNP纳米复合材料。采用熔融混合-热压法制备共混物及其纳米复合材料。热重分析和差示扫描量热分析表明,纳米复合材料的热稳定性优于共混物。利用介电阻抗分析仪在10 Hz ~ 1 MHz的室温频率范围内测量了纳米复合材料的介电性能。PS/PVDF共混物的介电常数随GNP负荷的增加而增加。当PS/PVDF-50 vol%, GNP为15 wt%时,在100 Hz时介电常数高达71,介电损耗为0.28。通过将GNP加入到PS/PVDF共混物中,可以提高介电常数,这些纳米复合材料可以成为电介质或电容器应用的潜在候选材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Graphene Nanoplatelets (GNP) on the Dielectric and Thermal Properties of Polystyrene (PS)/Polyvinylidenedifluoride (PVDF) Blends
Polymer films are of much importance in the development of capacitor technology because of their unique properties such as high breakdown strength, good stability and economic viability. The disadvantage of low dielectric constant for polymers can be overcome by incorporating various fillers into them. In this study, polystyrene (PS) blend with 50 volume percentage (vol%) polyvinylidenedifluoride (PVDF) is prepared and graphene nanoplatelets (GNP) in different weight percentages (0 to 15 wt%) are added to this blend to prepare PS/PVDF/GNP nanocomposites. The preparation of blend and its nanocomposites is carried out using melt mixing technique followed by hot pressing. Thermo gravimetric analysis and differential scanning calorimetry studies indicated that the nanocomposites exhibited better thermal stability than the blend. Dielectric properties of nanocomposites are measured at room temperature in the frequency range of 10 Hz to 1 MHz using a dielectric impedance analyzer. Dielectric constant of PS/PVDF blend is found to increase with increasing GNP loading. For PS/PVDF-50 vol% blend with 15 wt% GNP, dielectric constant as high as 71 and dielectric loss of 0.28 are obtained at 100 Hz. By incorporating GNP in PS/PVDF blend, the dielectric constant is enhanced and these nanocomposites can be a potential candidate material for dielectric or capacitor applications.
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