Enhanced Dielectric Permittivity of Optimized Surface Modified of Barium Titanate Nanocomposites
Enhanced Dielectric Permittivity of Optimized Surface Modified of Barium Titanate Nanocomposites
复制标题
DOI：
10.3390/polym12040827
复制
发表时间：
2020-04-01
期刊：
影响因子：
5
通讯作者：
Cook-Chennault, Kimberly
中科院分区：
文献类型：
--
作者：
Sundar, Udhay;Lao, Zichen;Cook-Chennault, Kimberly
高介电常数聚合物-陶瓷纳米复合介电薄膜利用了聚合物加工的灵活性和电活性陶瓷填充物的功能性。因此，这样的薄膜可以应用于印刷电路电路板的嵌入式储能设备。然而，亲水性陶瓷填料和疏水性环氧树脂的不相容限制了填料的浓度，从而限制了这些材料的介电常数。传统上，表面活性剂和陶瓷填料的核壳处理被用来实现静电和空间稳定，以获得足够的陶瓷颗粒分布，但关于这些过程的问题仍然存在。本工作的目的是了解表面活性剂浓度对陶瓷颗粒表面形貌的影响，以及复合介质的介电常数和电导率。对钛酸钡基环氧纳米复合材料进行了全面的研究。乙醇和3-缩水甘油基丙基三甲氧基硅烷的表面处理对颗粒团聚的抑制效果最好，介电常数最大，损耗最小。结果表明，对偶联剂进行优化处理后，复合材料的介电常数和损耗比未优化处理和传统表面活性剂处理的复合材料的介电常数和损耗降低了2~3倍。
High permittivity polymer-ceramic nanocomposite dielectric films take advantage of the ease of flexibility in processing of polymers and the functionality of electroactive ceramic fillers. Hence, films like these may be applied to embedded energy storage devices for printed circuit electrical boards. However, the incompatibility of the hydrophilic ceramic filler and hydrophobic epoxy limit the filler concentration and therefore, dielectric permittivity of these materials. Traditionally, surfactants and core-shell processing of ceramic fillers are used to achieve electrostatic and steric stabilization for adequate ceramic particle distribution but, questions regarding these processes still remain. The purpose of this work is to understand the role of surfactant concentration ceramic particle surface morphology, and composite dielectric permittivity and conductivity. A comprehensive study of barium titanate-based epoxy nanocomposites was performed. Ethanol and 3-glycidyloxypropyltrimethoxysilan surface treatments were performed, where the best reduction in particle agglomeration, highest value of permittivity and the lowest value of loss were observed. The results demonstrate that optimization of coupling agent may lead to superior permittivity values and diminished losses that are similar to 2-3 times that of composites with non-optimized and traditional surfactant treatments.