Effect of the coverage level of carboxylic acids as a modifier for barium titanate nanoparticles on the performance of poly(vinylidene fluoride)-based nanocomposites for energy storage applications
Effect of the coverage level of carboxylic acids as a modifier for barium titanate nanoparticles on the performance of poly(vinylidene fluoride)-based nanocomposites for energy storage applications
复制标题
羧酸作为钛酸钡纳米颗粒改性剂的覆盖水平对储能应用聚偏氟乙烯纳米复合材料性能的影响
DOI：
10.1039/c7cp08312b
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发表时间：
2018-03-07
影响因子：
3.3
通讯作者：
Wang, Hong
中科院分区：
文献类型：
--
作者：
Niu, Yujuan;Xiang, Feng;Wang, Hong
用有机基团对纳米填料进行表面改性是提高陶瓷/聚合物纳米复合材料性能的重要途径。由于羧酸在纳米颗粒表面上的覆盖水平很小，关于使用羧酸作为陶瓷纳米颗粒的表面改性剂的研究很少报道。然而，没有研究证明在纳米颗粒表面上的少量改性剂不能充分改善纳米颗粒的分散以及与基体的相容性。本文采用三种羧酸对纳米钛酸钡（BT）进行表面改性，并通过不同的方法调节改性剂在BT纳米粒子表面的覆盖度。通过介电谱、击穿强度、漏电流和D-E环测量分析了由分散在聚偏氟乙烯（PVDF）聚合物基体中的改性BT纳米颗粒合成的纳米复合膜。结果表明，随着改性剂表面覆盖度的增加，改性剂分子的偶极矩和极化率对复合材料的介电常数有很大的影响。由于多种因素的影响，随着改性剂含量的增加，三种改性剂的纳米复合材料的击穿强度的变化表现出差异。对于应用于储能的纳米复合材料，需要结合纳米复合材料的各种性能来确定纳米颗粒表面改性剂的最佳含量。
Surface modification on nanoparticle fillers with organic groups is important to improve the performance of ceramic/ polymer nanocomposites. Due to the small coverage level of carboxylic acids on the nanoparticle surface, studies on the use of carboxylic acids as a surface modifier for ceramic nanoparticles have been rarely reported. However, there is no study that proves that a small amount of modifier on the surface of nanoparticles cannot adequately improve the dispersion as well as the compatibility of nanoparticles with the matrix. Herein, we used three carboxylic acids to treat the surface of BaTiO3 (BT) nanoparticles and adjusted the coverage level of the modifiers on the surface of BT nanoparticles through different ways. The nanocomposite films synthesized from the modified BT nanoparticles dispersed in the poly(vinylidene fluoride) (PVDF) polymer matrix were analyzed by dielectric spectroscopy, breakdown strength, leakage currents, and D-E loop measurements. The results show that the molecule dipole moment and polarizability of the modifier greatly influence the permittivity of the nanocomposites as the surface coverage level of the modifiers increases. Due to many influential factors, changes in the breakdown strength of the nanocomposites show diversity for three modifiers as the modifier content increases. For the nanocomposites applied in energy storage, the optimal content of the modifier on the surface of the nanoparticles needs to be determined by combining various properties of the nanocomposites.