Abstract

In regards to the advances in hybrid polymer nanocomposite (HPNC) materials for high-frequency nanodielectric applications, herein we report the broadband radio frequency range (1 MHz to 1 GHz) dielectric permittivity and electrical conductivity of composites of poly(ethylene oxide) (PEO)/poly(methyl methacrylate) (PMMA) blend matrices and oxide nanofillers (tin oxide (SnO₂) and silica (SiO₂)), in the form of PEO/PMMA/SnO₂ and PEO/PMMA/SiO₂ films at ambient temperature. The results confirmed that these HPNCs have low dielectric permittivity values which decrease slightly, from 3.4 to 2.8, with increasing nanofillers concentrations and the applied electric field frequency. The dependency of the dielectric permittivity on the different oxide nanoparticles sizes and their dielectric constant was explored. The dielectric loss tangent spectra of these hybrid materials indicated that they were reasonably low loss nanodielectrics having a dipolar orientation relaxation in the higher frequency region. The radiofrequency electrical conductivity of the HPNCs was found to increase linearly from ∼10⁻⁸ to 10⁻⁴ S/cm with the increase of frequency, and it was less dependent on the fillers concentrations. Considering the dielectric and electrical properties, it is proposed that these PEO/PMMA/SnO₂ and PEO/PMMA/SiO₂ composites could be highly useful materials for dielectric substrates and insulators in the development of radiofrequency operative flexible-type electrical and electronic components and devices.

摘要

关于用于高频纳米电介质应用的杂化聚合物纳米复合材料 (HPNC) 材料的进展，本文报告了聚环氧乙烷 (PEO) 复合材料的宽带射频范围 (1 MHz 至 1 GHz) 介电常数和电导率)/聚（甲基丙烯酸甲酯）（PMMA）共混基质和氧化物纳米填料（氧化锡（SnO ₂）和二氧化硅（SiO ₂）），以PEO/PMMA/SnO ₂和PEO/PMMA/SiO _2的形式薄膜在环境温度下。结果证实，这些 HPNC 具有低介电常数值，随着纳米填料浓度和施加的电场频率的增加，介电常数值略有下降，从 3.4 降至 2.8。探讨了介电常数对不同氧化物纳米粒子尺寸及其介电常数的依赖性。这些混合材料的介电损耗正切光谱表明它们是相当低的损耗纳米电介质，在高频区域具有偶极取向弛豫。发现 HPNC 的射频电导率从～10 ^-8线性增加到 10 ^-4S/cm随频率的增加而增加，对填料浓度的依赖性较小。考虑到介电和电学性能，建议这些 PEO/PMMA/SnO ₂和 PEO/PMMA/SiO ₂复合材料在开发射频操作柔性型电气和电子元件和设备。