Improved dielectric, tensile and energy storage properties of surface rubberized BaTiO3/polypropylene nanocomposites
Improved dielectric, tensile and energy storage properties of surface rubberized BaTiO3/polypropylene nanocomposites
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DOI：
10.1016/j.nanoen.2018.03.049
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发表时间：
2018-06
期刊：
影响因子：
17.6
通讯作者：
M. Zheng;Yu-ting Zheng;J. Zha;Y. Yang;Peng Han;Y. Wen;Z. Dang
中科院分区：
文献类型：
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作者：
M. Zheng;Yu-ting Zheng;J. Zha;Y. Yang;Peng Han;Y. Wen;Z. Dang
聚丙烯（PP）薄膜的低介电常数已成为进一步发展高储能密度薄膜电容器的障碍。高介电常数填料/聚合物纳米复合材料的先进策略被证明是解决这一问题的一种有前途的方法。本工作中，我们成功地在BaTiO 3表面包覆了三元乙丙橡胶（EPDM）作为壳层，制备了核壳结构纳米粒子。在PP基体中加入表面橡胶化的BaTiO_3，使材料的介电常数提高到5.8左右，而介电损耗与PP基体相比变化不大。此外，断裂伸长率高达364%，是PP的4倍以上。研究了壳层厚度（3 nm、5 nm和7 nm）和热拉伸工艺对纳米复合材料性能的影响。最后，最佳击穿强度高达370 MV/m，导致最大能量密度为3.06 J/cm 3，这可以归因于高击穿强度和高介电常数的核壳结构BaTiO 3/PP纳米复合材料。
The low permittivity of the polypropylene (PP) film has become a barrier for the further development of film capacitors with high energy storage density. An advanced strategy of the high-permittivity filler/polymer nanocomposite turns out to be a promising way of solving this problem. In this work, we coated ethylene propylene diene monomer (EPDM) as the shell on the surfaces of BaTiO3successfully to fabricate core-shell structural nanoparticles. The addition of surface rubberized BaTiO3into PP matrix promotes the permittivity to about 5.8, while the dielectric loss is barely changed as compared with PP itself. In addition, the elongation at break is as high as 364%, which is over 4 times higher than that of PP. The influences of shell thickness (3 nm, 5 nm and 7 nm) for the nanoparticles and hot-stretching process for the nanocomposite films were also carefully investigated, both of which greatly affected the properties of nanocomposites. Finally, the optimum breakdown strength as high as 370 MV/m is obtained, leading to a maximum energy density of 3.06 J/cm3, which can be attributed to both high breakdown strength and high permittivity of the core-shell structural BaTiO3/PP nanocomposites.