Amine-Functionalized Reduced Graphene Oxide/Polyimide Nanocomposite as a Material with High Dielectric Constant and Thermal Resistance

Abstract

With the development of renewable energy resources, polymer-based dielectric materials, as key components in energy storage devices with optimized dielectric property, high-temperature stability, and good processibility, are highly demanded. In this study, p-phenylenediamine (PPD)-modified and l-ascorbic acid (LAA)-reduced graphene oxide (NH2-CRG) nanosheets with significant chemical functionalization and significantly improved dispersity were prepared. Also, polyimide was chosen to be the polymer matrix due to its high-temperature resistance, chemical inertness, and excellent mechanical property. By incorporating NH2-CRG into the PI polymer matrix via in situ polymerization, 0.8 wt % NH2-CRG/PI composite material with a dielectric constant as high as 839 and a breakdown strength of 80 kV·mm–1 was obtained. Meanwhile, the 5 wt % weight loss temperature of 0.8 wt % NH2-CRG/PI witnessed a 17.6 °C increase compared to pure PI. This work provided a promising strategy to prepare graphene-based materials for high-dielectric applications and a realizable process of fabricating polymer-based dielectric composite materials.

Renewable Lignin-Derived Graphene-like/PVDF Nanocomposites with High Dielectric Constant and Low Loss Tangent

“…Carbon content reflects graphene material quality and purity, and the C/O atomic ratios increase by approximately 600% from 0.95 to 5.74 for the AL precursor to LG filler. The carbon content of LG filler can be compared to that of conventional rGO 30,32,35,36 and higher than that of previously reported lignin-derived graphene. 27,29−31 The high-resolution C 1s spectra were deconvoluted into carbon−carbon (C�C and C−C) and carbon−oxygen (C�O and C−O) functional groups in Figure 2b,c.…”

“…Carbon content reflects graphene material quality and purity, and the C/O atomic ratios increase by approximately 600% from 0.95 to 5.74 for the AL precursor to LG filler. The carbon content of LG filler can be compared to that of conventional rGO ,,, and higher than that of previously reported lignin-derived graphene. ,− The high-resolution C 1s spectra were deconvoluted into carbon–carbon (CC and C–C) and carbon–oxygen (CO and C–O) functional groups in Figure b,c. It is obvious that, when compared to the AL precursor, the carbon–oxygen functional groups decrease dramatically while those of the carbon–carbon functional groups increase significantly for the LG filler.…”

Diethylenetriamine-functionalized reduced graphene oxide having more amino groups for methylene blue removal

“…The products or composites possessed excellent properties. These compounds might include 1-aminopropyl-3methylimidazolium chloride, 7 1,4-phenylenediamine or 2,3,5,6-tetramethyl-1,4-phenylenediamine, 8,9 amino-modied MXene (3-trimethoxysilylpropan-1-amine modied MXene), 10 ethylenediamine, [11][12][13] 4,4 ′ -diaminodiphenylmethane, 14 and amino acids (e.g., alanine, tyrosine, and cysteine). 15 The epoxide of GO can also react with an amino group that is also attached directly or indirectly to the graphene sheet.…”

Three‐phase interfacial design in BaTiO3/rGO/polyetherimide composite enabling enhanced dielectric, thermal and mechanical properties

“…5 However, there exist an obvious trade-off when using these conductive or insulative fillers. For example, by incorporating conductive fillers such as metal nanoparticles, 6,7 carbon nanotubes (CNTs), [8][9][10][11] or graphene nano-pellets (GNPs), [12][13][14][15] it is possible to achieve high dielectric constant in composite materials but frequently accompanying with obvious leakage current, therefore resulting in serious dielectric loss. In comparison, perovskite ceramics incorporated polymer 16,17 materials usually have smaller dielectric loss, but the deteriorated thermal and mechanical properties brought by relatively large loading fraction of ceramics are other serious issues to be carefully considered.…”