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A Facile Strategy to Enhance the Dielectric and Mechanical Properties of MWCNTs/PVDF Composites with the Aid of MMA-co-GMA Copolymer

机译:借助MMA-co-GMA共聚物增强MWCNTs / PVDF复合材料介电和机械性能的简便策略

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摘要

A facile strategy is adopted to prepare carboxylic functionalized multiwalled carbon nanotube (c-MWCNT) modified high dielectric constant (high-k) poly(vinylidene fluoride) (PVDF) composites with the aid of methyl methacrylate-co-glycidyl methacrylate copolymer (MG). The MG is miscible with PVDF and the epoxy groups of the copolymer can react with the carboxylic groups of c-MWCNT, which induce the uniform dispersion of c-MWCNT and a form insulator layer on the surface of c-MWCNT. The c-MWCNTs/MG/PVDF composites with 8 vol % c-MWCNT present excellent dielectric properties with high dielectric constant (~448) and low dielectric loss (~2.36) at the frequency of 1 KHz, the dielectric loss is much lower than the c-MWCNT/PVDF composites without MG. The obvious improvement in dielectric properties ascribes to the existence of MG, which impede the direct contact of c-MWCNTs and PVDF and avoid the formation of conductive network. Therefore, we propose a practical and simple strategy for preparing composites with excellent dielectric properties, which are promising for applications in electronics devices.
机译:采用一种简便的策略,借助甲基丙烯酸甲酯-甲基丙烯酸缩水甘油酯共聚物(MG)来制备羧基官能化的多壁碳纳米管(c-MWCNT)改性的高介电常数(high-k)聚偏二氟乙烯(PVDF)复合材料。 MG可与PVDF混溶,共聚物的环氧基可与c-MWCNT的羧基反应,从而导致c-MWCNT均匀分散,并在c-MWCNT表面形成绝缘层。 c-MWCNTs为8%(体积)的c-MWCNTs / MG / PVDF复合材料在1 KHz频率下具有优异的介电性能,具有高介电常数(〜448)和低介电损耗(〜2.36),介电损耗远低于没有MG的c-MWCNT / PVDF复合材料。介电性能的明显改善归因于MG的存在,它阻碍了c-MWCNTs与PVDF的直接接触,并避免了导电网络的形成。因此,我们提出了一种实用且简单的制备具有优异介电性能的复合材料的策略,这有望用于电子设备。

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