Comparison to mechanical properties of epoxy nanocomposites reinforced by functionalized carbon nanotubes and graphene nanoplatelets

Cha, Jihoon; Kim, Joon Hui; Ryu, Seongwoo; Hong, Soon Hyung

doi:10.1016/j.compositesb.2018.11.011

Cited by 202 publications

(75 citation statements)

References 33 publications

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“…There are two main groups of functionalization methods, namely, covalent and non-covalent functionalization. The first group of functionalization methods is characterized by the surface oxidation of carbon and the binding of organic/inorganic ions/atoms/molecules via covalent bonds, using atoms (fluorine or nitrogen), functional groups (hydroxyl, amino or carboxyl groups), biomolecules, or polymers, at end-caps and defect sites [32,51]. Consequently, the interfacial interactions of GR are highly enhanced.…”

Section: Functionalizationmentioning

confidence: 99%

Graphenic Materials for Biomedical Applications

2019

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Graphene-based nanomaterials have been intensively studied for their properties, modifications, and application potential. Biomedical applications are one of the main directions of research in this field. This review summarizes the research results which were obtained in the last two years (2017-2019), especially those related to drug/gene/protein delivery systems and materials with antimicrobial properties. Due to the large number of studies in the area of carbon nanomaterials, attention here is focused only on 2D structures, i.e. graphene, graphene oxide, and reduced graphene oxide.

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Section: Functionalizationmentioning

confidence: 99%

Graphenic Materials for Biomedical Applications

2019

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“…For the f‐GNPs, T 5% , T 10% , and T Max increased by approximately 130°C, and the maximum mass loss rate decreased to 8%/min. These features differed from the noncovalent functionalization between GNPs and MEL under ball‐milling conditions . In these previous reports, the noncovalent functionalization that formed after ball milling does not improve the T Max in their TG curves, and the noncovalent MEL disappeared upon washing with hot water .…”

Section: Resultsmentioning

confidence: 69%

“…As reported previously and shown in Figure 1A, by using 1,3,5‐triazine‐2,4,6‐triamine (MEL) and ball milling, noncovalently functionalized GNPs can be produced to improve the interfacial adhesion of the GNPs with an epoxy matrix. However, the π‐π interactions are noncovalent and do not change the GNP surface properties markedly.…”

Section: Introductionmentioning

confidence: 87%

Direct diazotization of graphite nanoplatelets with melamine and their favorable application in epoxy resins

Qin

Zhang

2020

Polymers for Advanced Techs

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The ease of undesirable agglomeration and a low efficiency are two problems that restrict the application of graphite nanoplatelets (GNPs) in epoxy resins (EP). Herein, a new strategy with melamine (MEL) as the precursor to functionalize GNPs chemically, which form a bonding layer that is compatible with epoxy matrix, is reported.The MEL fragments with secondary amine groups were grafted uniformly on the GNPs surface by covalent junctions to exploit the diazonium chemistry. This behavior led to a better dispersion and a stronger interaction with the epoxy matrix and resulted in an enhanced glass transition temperature and bending strength, compared with the pure EP. When only 1 wt% functionalized GNPs (f-GNPs) was used, the Tg of the modified EP raised of about 15 C compared with pure EP, and the bending strength increased by approximately 39%. The dielectric constant of the EP with f-GNPs was impacted slightly, and the dielectric loss decreased. At 10 5 Hz, the dielectric loss of the EP with 1 wt% f-GNPs decreased by approximately 11% compared with pure EP. Therefore, diazotization modification of the GNPs is a useful approach to improve the compatibility in nanoparticle networks. K E Y W O R D S compatibility, epoxy resins, graphite nanoplatelets

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“…Additionally, for the nanocomposites with plenty of CNTs, the pull-out of CNT and CNT bridging are the main enhancement mechanisms of mechanical properties. The reinforcing effect by nanoparticle bridging and the push-pull mechanism has been also observed within the CNT-epoxy nanocomposites [ 49 ], GNP based epoxy nanocomposites [ 49 , 50 ], and nanocomposites with hybrid nano-fillers [ 51 ]. Figure 18 b shows the SEM image (×5000) of the nanocomposite specimen with a MWCNT:GNP ratio of 9:1.…”

Section: Resultsmentioning

confidence: 99%

Synergistic Effect of Multi-Walled Carbon Nanotubes and Graphene Nanoplatelets on the Monotonic and Fatigue Properties of Uncracked and Cracked Epoxy Composites

2020

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The fatigue properties of the polymer nanocomposites reinforced with a hybrid nano-filler system have seldom studied before. Accordingly, epoxy nanocomposites with various multi-walled carbon nanotube (MWCNT)/graphene nanoplatelet (GNP) filler ratios were prepared to study comprehensively the synergistic effect of the hybrid nano-fillers on the monotonic and cyclic mechanical properties of the nanocomposites. The quasi-statically tensile properties and fatigue-life curves were experimentally determined using uncracked bulk specimens. Additionally, pre-cracked specimens were utilized to study the fracture toughness and fatigue crack growth rate of the nanocomposites. A synergistic index based on the properties of the nanocomposites with individual types of filler was proposed to evaluate the synergistic effect of two employed nano-fillers on the studied properties. The index was verified to be a highly discriminatory tool to evaluate the synergistic effect of hybrid nano-fillers on the studied mechanical properties. The experimental results show that the composites with a MWCNT:GNP ratio of 1:9 have the higher monotonic and fatigue properties than those with other filler ratios. Adding appropriate amount of CNTs can prevent the agglomeration of GNPs. The flexible CNTs bridge adjacent GNPs to constitute a favorable network for load transfer. Moreover, there is a linear relationship between the static and fatigue strengths of the studied nanocomposites. Integrated analysis of experimental data and a fracture surface study reveals that the dispersion of nano-fillers influences the mechanical properties significantly. The crack deflection effect due to the path bifurcation caused by encountering the filler cluster and the filler bridging effect are the main reinforcement mechanism of the studied properties.

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Comparison to mechanical properties of epoxy nanocomposites reinforced by functionalized carbon nanotubes and graphene nanoplatelets

Cited by 202 publications

References 33 publications

Graphenic Materials for Biomedical Applications

Graphenic Materials for Biomedical Applications

Direct diazotization of graphite nanoplatelets with melamine and their favorable application in epoxy resins

Synergistic Effect of Multi-Walled Carbon Nanotubes and Graphene Nanoplatelets on the Monotonic and Fatigue Properties of Uncracked and Cracked Epoxy Composites

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