Improving the processability of graphene nanoplatelets in polyamide 6 during melt compounding extrusion

Blanco-Villalba, José Francisco; Recio, Imanol; Gómez-Cordón, Julio; Hübner, Christof

doi:10.1063/1.5084888

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…GRMs with high SBET values produced by thermochemical reduction exhibit low densities, even lower than 4 g l −1 [311]. For some applications a compaction of the RGO for further processing is needed [321].…”

Section: Ii32 Reduction Of Gomentioning

confidence: 99%

Production and processing of graphene and related materials

et al. 2020

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We present an overview of the main techniques for production and processing of graphene and related materials (GRMs), as well as the key characterization procedures. We adopt a ‘hands-on’ approach, providing practical details and procedures as derived from literature as well as from the authors’ experience, in order to enable the reader to reproduce the results. Section is devoted to ‘bottom up’ approaches, whereby individual constituents are pieced together into more complex structures. We consider graphene nanoribbons (GNRs) produced either by solution processing or by on-surface synthesis in ultra high vacuum (UHV), as well carbon nanomembranes (CNM). Production of a variety of GNRs with tailored band gaps and edge shapes is now possible. CNMs can be tuned in terms of porosity, crystallinity and electronic behaviour. Section covers ‘top down’ techniques. These rely on breaking down of a layered precursor, in the graphene case usually natural crystals like graphite or artificially synthesized materials, such as highly oriented pyrolythic graphite, monolayers or few layers (FL) flakes. The main focus of this section is on various exfoliation techniques in a liquid media, either intercalation or liquid phase exfoliation (LPE). The choice of precursor, exfoliation method, medium as well as the control of parameters such as time or temperature are crucial. A definite choice of parameters and conditions yields a particular material with specific properties that makes it more suitable for a targeted application. We cover protocols for the graphitic precursors to graphene oxide (GO). This is an important material for a range of applications in biomedicine, energy storage, nanocomposites, etc. Hummers’ and modified Hummers’ methods are used to make GO that subsequently can be reduced to obtain reduced graphene oxide (RGO) with a variety of strategies. GO flakes are also employed to prepare three-dimensional (3d) low density structures, such as sponges, foams, hydro- or aerogels. The assembly of flakes into 3d structures can provide improved mechanical properties. Aerogels with a highly open structure, with interconnected hierarchical pores, can enhance the accessibility to the whole surface area, as relevant for a number of applications, such as energy storage. The main recipes to yield graphite intercalation compounds (GICs) are also discussed. GICs are suitable precursors for covalent functionalization of graphene, but can also be used for the synthesis of uncharged graphene in solution. Degradation of the molecules intercalated in GICs can be triggered by high temperature treatment or microwave irradiation, creating a gas pressure surge in graphite and exfoliation. Electrochemical exfoliation by applying a voltage in an electrolyte to a graphite electrode can be tuned by varying precursors, electrolytes and potential. Graphite electrodes can be either negatively or positively intercalated to obtain GICs that are subsequently exfoliated. We also discuss the materials that can be amenable to exfoliation, by ...

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Section: Ii32 Reduction Of Gomentioning

confidence: 99%

Production and processing of graphene and related materials

et al. 2020

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“…Blanco-Villalba at al. 83 produced PA6/GNP nanocomposites by melt compounding via the twin-screw extruder. The compaction process allowed loading up to 20 wt% of GNPs in PA6 and showed that the compaction process did not hinder dispersion of GNPs or their thermal properties.…”

Section: Melt Blendingmentioning

confidence: 99%

“…Blanco-Villalba at al. 83 prepared GNP/PA6 nanocomposites by melt compounding using a twinscrew extruder. The Polder-van Santen-Bo ¨ttcher model was used to define the thermal properties of the composite materials (equation ( 1)).…”

Section: Thermal Propertiesmentioning

confidence: 99%

Graphene/graphene nanoplatelets reinforced polyamide nanocomposites: A review

Madhad

Mishra

Patel

et al. 2021

High Performance Polymers

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Graphene and its derivatives have received considerable attention in industrial and academic research due to their unique, useful properties and applications. The use of graphene is still difficult due to its high cost of production. Hence, graphene nanoplatelets (GNPs) have been identified as a substitute for graphene, which are produced in large scale at a very low cost. Moreover, GNPs have played a significant role in various engineering thermoplastic materials [i.e., polyamides (PAs)] to enhance their properties and applications. The GNPs help in the production of low-cost multifunctional nanocomposites with notable useful properties such as high electrical conductivity, mechanical strength, and high aspect ratio. The GNPs based nanocomposites have a broad spectrum of application areas including 3D-printing, automotive materials, electrical appliances, low-cost composites films, and many more. This review summarizes different preparation techniques, properties, and applications of GNPs based PAs nanocomposites as reported in current literature.

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Improving the processability of graphene nanoplatelets in polyamide 6 during melt compounding extrusion

Cited by 2 publications

References 3 publications

Production and processing of graphene and related materials

Production and processing of graphene and related materials

Graphene/graphene nanoplatelets reinforced polyamide nanocomposites: A review

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