Thermally Reduced Graphite Oxide and Mechanochemically Functionalized Graphene as Functional Fillers for Epoxy Nanocomposites

Tschoppe, Katrin; Beckert, Fabian; Beckert, M.; Mülhaupt, Rolf

doi:10.1002/mame.201400245

Cited by 40 publications

(29 citation statements)

References 46 publications

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“…an increase of 13.4 %). Tschoppe et al (2015) report an increase in the modulus of 8.5 % for an epoxy composite filled with 1.5 wt% of thermally reduced GO and 11.4 % for that filled with 2 wt% of nitrogen-doped thermally reduced GO, whereas Zaman et al (2011) observed a modest 7 % increase in modulus on adding 2 wt% of 4,4 0 -methylene diphenyl diisocyanate (MDI)-functionalized GNP to epoxy. The increase in modulus observed in the present work may be ascribed to the relatively high modulus of the rGO filler and to the good interfacial adhesion between the rGO and the epoxy matrix.…”

Section: Thermo-mechanical Propertiesmentioning

confidence: 99%

In situ thermally reduced graphene oxide/epoxy composites: thermal and mechanical properties

et al. 2016

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Graphene has excellent mechanical, thermal, optical and electrical properties and this has made it a prime target for use as a filler material in the development of multifunctional polymeric composites. However, several challenges need to be overcome to take full advantage of the aforementioned properties of graphene. These include achieving good dispersion and interfacial properties between the graphene filler and the polymeric matrix. In the present work, we report the thermal and mechanical properties of reduced graphene oxide/epoxy composites prepared via a facile, scalable and commercially viable method. Electron micrographs of the composites demonstrate that the reduced graphene oxide (rGO) is well dispersed throughout the composite. Although no improvements in glass transition temperature, tensile strength and thermal stability in air of the composites were observed, good improvements in thermal conductivity (about 36 %), tensile and storage moduli (more than 13 %) were recorded with the addition of 2 wt% of rGO.

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Section: Thermo-mechanical Propertiesmentioning

confidence: 99%

In situ thermally reduced graphene oxide/epoxy composites: thermal and mechanical properties

et al. 2016

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“…A detailed report about the synthesis procedure is presented by Tschoppe, et al [23]. Shortly, TRGO (thermally reduced graphite oxide) was synthesized by oxidation of graphite oxide and subsequent thermal reduction.…”

Section: Methodsmentioning

confidence: 99%

Modified Nitrogen-Doped Graphene Electrocatalyst for Oxygen Reduction Reaction in Alkaline Fuel Cells

Qazzazie¹,

Beckert²,

Mülhaupt³

et al. 2015

JEPE

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Abstract:We report modified nitrogen-doped graphene (CN) as electrocatalyst for ORR (oxygen reduction reaction) in alkaline medium. CN was synthesized by a novel procedure based on graphite oxide thermally treated with cyanamide suitable for facile N-doping and large-scale production, whereas cyanamide was used as N-precursor. The structure of the material was characterized by TEM (transmission electron microscopy), SEM (scanning electron microscopy), Raman spectroscopy and XPS (X-ray photoelectron spectroscopy). Structural and electrochemical properties of CN were compared with those of non-modified graphene (TRGO (thermally reduced graphite oxide)). The electrochemical characterization of TRGO and CN in alkaline solution demonstrates enhanced electrocatalytic ORR activity and improved long-term stability for N-doped CN. Voltammetric studies confirmed that, oxygen reduction on CN rather follows four-electron pathway. Compared with commercial 20% PtC catalyst, CN is characterized by exceptional methanol crossover resistance and superb long-term operation stability. Owing to these factors, nitrogen-doped graphene has a great potential to be used as metal-free electrocatalyst in cathodes of alkaline fuel cells.

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“…Carbon‐based nanomaterials, including carbon nanotubes (CNTs), carbon nanohorns, and carbon nanocones/disks; and graphene and its derivations, such as graphene nanoplatelets (GNPs), porous graphene (NPG's), and graphene oxide (GO), are highly consumed as a means to modify the mechanical properties and toughness of epoxy‐based nanocomposites . Among nanocarbon materials, graphene, an atomic‐scale material with two‐dimensional (2D) honeycomb lattice and high‐specific surface area, has gained greater heed due to its magnificent properties.…”

Section: Introductionmentioning

confidence: 99%

“…Among nanocarbon materials, graphene, an atomic‐scale material with two‐dimensional (2D) honeycomb lattice and high‐specific surface area, has gained greater heed due to its magnificent properties. Furthermore, it is worth mentioning that graphene is capable of fostering thermal and electrical properties of epoxy resin nanocomposites without hampering its stiffness (limiting its mechanical properties) . In our previous study, a synthetized porous graphene was added to epoxy matrices cured with four various hardeners in varying contents from 0 to 1 wt %.…”

Section: Introductionmentioning

confidence: 99%

Reinforcing effect of amine‐functionalized and carboxylated porous graphene on toughness, thermal stability, and electrical conductivity of epoxy‐based nanocomposites

Naderi

Ebrahimi

Najafi

et al. 2019

J of Applied Polymer Sci

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Epoxy‐based nanocomposites reinforced with nonfunctionalized porous graphene (NPG), carboxylated porous graphene (CNPG), and amine‐functionalized porous graphene (ANPG) were investigated with regard to mechanical properties, thermal stability, and electrical conductivity. Nanomaterials were added to the epoxy matrix in varying contents of 0.5, 1, and 2 wt %. Generally, mechanical properties were improved as a result of introducing nanomaterials into the epoxy resin. However, the amelioration of toughness was only observed in functionalized NPGs/epoxy nanocomposites. Field emission scanning electron microscopy images showed that functionalized nanomaterials induced a rougher fracture surface compared to the neat epoxy. Dynamic mechanical analysis along with differential scanning calorimetry confirmed an increment in the glass‐transition temperature (Tg) of the reinforced nanocomposites. Also, they proved that functionalization made the epoxy network tougher and more flexible. The electrical conductivity and thermal stability of the epoxy resin were also improved when loaded with nanomaterials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47475.

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Thermally Reduced Graphite Oxide and Mechanochemically Functionalized Graphene as Functional Fillers for Epoxy Nanocomposites

Cited by 40 publications

References 46 publications

In situ thermally reduced graphene oxide/epoxy composites: thermal and mechanical properties

In situ thermally reduced graphene oxide/epoxy composites: thermal and mechanical properties

Modified Nitrogen-Doped Graphene Electrocatalyst for Oxygen Reduction Reaction in Alkaline Fuel Cells

Reinforcing effect of amine‐functionalized and carboxylated porous graphene on toughness, thermal stability, and electrical conductivity of epoxy‐based nanocomposites

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