Effect of surface treatment of graphene nanoplatelets for improvement of thermal and electrical properties of epoxy composites

Kim, Minjae; Kim, Yeongseon; Baeck, Sung Hyeon; Shim, Sang Eun

doi:10.5714/cl.2015.16.1.034

Cited by 18 publications

(6 citation statements)

References 26 publications

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“…Kim et al . 23 found that surface-treated GNP reduce interfacial resistance between nanoparticles and the polymer matrix, improving thermal conductivity. Another option is to align nanofillers by an electric field.…”

Section: Introductionmentioning

confidence: 98%

Thermal Diffusivity Mapping of Graphene Based Polymer Nanocomposites

Grésil

Wang

Poutrel

et al. 2017

Sci Rep

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Nanoparticle dispersion is widely recognised as a challenge in polymer nanocomposites fabrication. The dispersion quality can affect the physical and thermomechanical properties of the material system. Qualitative transmission electronic microscopy, often cumbersome, remains as the ‘gold standard’ for dispersion characterisation. However, quantifying dispersion at macroscopic level remains a difficult task. This paper presents a quantitative dispersion characterisation method using non-contact infrared thermography mapping that measures the thermal diffusivity (α) of the graphene nanocomposite and relates α to a dispersion index. The main advantage of the proposed method is its ability to evaluate dispersion over a large area at reduced effort and cost, in addition to measuring the thermal properties of the system. The actual resolution of this thermal mapping reaches 200 µm per pixel giving an accurate picture of graphene nanoplatelets (GNP) dispersion. The post-dispersion treatment shows an improvement in directional thermal conductivity of the composite of up to 400% increase at 5 wt% of GNP. The Maxwell-Garnet effective medium approximation is proposed to estimate thermal conductivity that compare favourably to measured data. The development of a broadly applicable dispersion quantification method will provide a better understanding of reinforcement mechanisms and effect on performance of large scale composite structures.

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Section: Introductionmentioning

confidence: 98%

Thermal Diffusivity Mapping of Graphene Based Polymer Nanocomposites

Grésil

Wang

Poutrel

et al. 2017

Sci Rep

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“…On the other hand, Figure 6b AGO-100, Figure 6c GGO-100 and Figure 6d AGO-150 and Figure 6e GGO-150 samples exhibit rough surface with wrinkle morphology and the inserted magnified image on all the four samples shows several thin sheets with puffy structures [22], which signify the present of silane moieties that act as a spacer between the GO sheets and hence preventing restacking [24,25]. The distinction in morphology observed between GO and the functionalized-GO results from covalent bonding and condensation reactions between silanes molecules and GO sheets which subsequently hinders agglomeration [26].…”

Section: Resultsmentioning

confidence: 99%

Gamma-Irradiation Induced Functionalization of Graphene Oxide with Organosilanes

Aujara

Chieng

Ibrahim

et al. 2019

IJMS

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Gamma-ray radiation was used as a clean and easy method for turning the physicochemical properties of graphene oxide (GO) in this study. Silane functionalized-GO were synthesized by chemically grafting 3-aminopropyltriethoxysilane (APTES) and 3-glycidyloxypropyltrimethoxysilane (GPTES) onto GO surface using gamma-ray irradiation. This established non-contact process is used to create a reductive medium which is deemed simpler, purer and less harmful compared conventional chemical reduction. The resulting functionalized-GO were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), thermogravimetric analysis (TGA), and Raman spectroscopy. The chemical interaction of silane with the GO surface was confirmed by FT-IR. X-ray diffraction reveals the change in the crystalline phases was due to surface functionalization. Surface defects of the GO due to the introduction of silane mioties was revealed by Raman spectroscopy. Thermogravimetric analysis of the functionalized-GO exhibits a multiple peaks in the temperature range of 200–650 °C which corresponds to the degradation of chemically grafted silane on the GO surface.

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“…By utilizing layered reinforcements with a large aspect ratio, such as graphite flake, which can be exfoliated and dispersed in a polymer matrix as nanoplatelets, polymer nanocomposites have exhibited improved mechanical, thermal and barrier properties, depending upon the type of nanoplatelets [73][74][75].…”

Section: Improvement In Adhesion Of Carbon Fiber/ Bmi Composites Usinmentioning

confidence: 99%

Phenylethynyl-terminated polyimide, exfoliated graphite nanoplatelets, and the composites: an overview

Cho

Drzal²

2016

Carbon letters

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In efforts to characterize and understand the properties and processing of phenylethynylterminated imide (LaRC PETI-5, simply referred to as PETI-5) oligomers and polymers as a high-temperature sizing material for carbon fiber-reinforced polymer matrix composites, PETI-5 imidization and thermal curing behaviors have been extensively investigated based on the phenylethynyl end-group reaction. These studies are reviewed here. In addition, the use of PETI-5 to enhance interfacial adhesion between carbon fibers and a bismaleimide (BMI) matrix, as well as the dynamic mechanical properties of carbon/BMI composites, are discussed. Reports on the thermal expansion behavior of intercalated graphite flake, and the effects of exfoliated graphite nanoplatelets (xGnP) on the properties of PETI-5 matrix composites are also reviewed. The dynamic mechanical and thermal properties and the electrical resistivity of xGnP/PETI-5 composites are characterized. The effect of liquid rubber amine-terminated poly(butadiene-co-acrylonitrile) (ATBN)-coated xGnP particles incorporated into epoxy resin on the toughness of xGnP/epoxy composites is examined in terms of its impact on Izod strength. This paper provides an extensive overview from fundamental studies on PETI-5 and xGnP, as well as applied studies on relevant composite materials.Key words: polyimide, exfoliated graphite nanoplatelets, carbon fiber, composite, properties Phenylethynyl-Terminated Imide PolymerPolyimides have been extensively used in the electronics industry [1] as coatings, films, or adhesives and also in composite applications [2] as a primary or secondary structural material. When incorporated with organic or inorganic fibers, including carbon fibers and glass fibers, they can potentially be applied as a sizing material for high-temperature uses. In advanced applications, one of the most desirable advantages of polyimides, especially the aromatic polyimides, is their excellent high-temperature performance. Their thermal characteristics, including high temperature stability and cure behavior, are critical to successful processing and to the final properties of the resulting polyimide. For aerospace and aircraft applications, advanced polymer materials must successfully maintain their properties at high service temperatures over a long exposure time [3][4][5].The important parameters influencing the heat resistance of a polymeric material are its glass transition temperature (T g ), melting point (T m ), thermal stability, and etc., which may depend on its thermal history. Accordingly, polymers that are used to fulfill such high temperature performance should exhibit a high T g or T m and have excellent thermal stability. Even though some polyimides meet the high temperature requirement, their uses have been limited due to processing difficulties, such as poor solubility in common solvents, the release of volatiles, brittleness, and high processing temperature [6,7].Aromatic polyimides, especially acetylene or ethynyl-terminated polyimides, have been extensiv...

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Effect of surface treatment of graphene nanoplatelets for improvement of thermal and electrical properties of epoxy composites

Cited by 18 publications

References 26 publications

Thermal Diffusivity Mapping of Graphene Based Polymer Nanocomposites

Thermal Diffusivity Mapping of Graphene Based Polymer Nanocomposites

Gamma-Irradiation Induced Functionalization of Graphene Oxide with Organosilanes

Phenylethynyl-terminated polyimide, exfoliated graphite nanoplatelets, and the composites: an overview

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