Thermally conductive and electrically insulating epoxy nanocomposites with silica-coated graphene

Xue, Pu; Zhang, Haobin; Li, Xiaofeng; Gui, Chen-Xi; Yu, Zhong‐Zhen

doi:10.1039/c4ra00518j

Cited by 92 publications

(58 citation statements)

References 32 publications

(33 reference statements)

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“…Other important reasons for the difference between thermal and electrical conductivities were the contact resistance for the heat flow between neighboring fillers and the interfacial thermal resistance between fillers and the matrix. The modulus mismatch or the weak interfacial interaction due to poor compatibility at fillerematrix interface caused strong interfacial phonon scattering, which reduced the thermal conductivity of the composite [13,14]. In addition, the thermal conductivity of graphene dropped sharply by a small amount of epoxy or hydroxyl groups on surface [29,30], which may also be a cause of limited thermal conductivity enhancement by TRG0.…”

Section: Characteristics Of Graphene/alumina Sphere/tpu Compositementioning

confidence: 94%

Graphene coated with alumina and its utilization as a thermal conductivity enhancer for alumina sphere/thermoplastic polyurethane composite

Kim

Dao

Jeong

et al. 2015

Materials Chemistry and Physics

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Section: Characteristics Of Graphene/alumina Sphere/tpu Compositementioning

confidence: 94%

Graphene coated with alumina and its utilization as a thermal conductivity enhancer for alumina sphere/thermoplastic polyurethane composite

Kim

Dao

Jeong

et al. 2015

Materials Chemistry and Physics

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“…1,2 Due to their outstanding interface adhesion, 3 sealing, 4 corrosion resistance, 5 electrical insulating, 6 and mechanical performances, 7 various epoxy resin products have been widely applied in many industries, such as adhesives, 8 coatings, 9 sealants, 10 and composite structural components, 11 etc. In recent decades, with the rapid development and extensive application of polymer materials, their potential re risk has aroused more and more attention.…”

Section: Introductionmentioning

confidence: 99%

Flame-retardant effect of a novel phosphaphenanthrene/triazine-trione bi-group compound on an epoxy thermoset and its pyrolysis behaviour

Qiu

Qian

2016

RSC Adv.

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A novel phosphaphenanthrene/triazine-trione bi-group flame retardant TOD containing two different chemical bridge bonds between phosphaphenanthrene and triazine-trione groups was synthesized through the addition reaction of 1,3,5-triglycidyl isocyanurate (TGIC), 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and 10-(2,5-dihydroxyphenyl)-10-H-9-oxa-10-phosphaphenanthrene-10-oxide (ODOPB) three raw materials in turn. TOD was then applied to prepare the flame-retardant epoxy thermoset in the diglycidyl ether of bisphenol-A cured with 4,4 0 -diamino-diphenyl methane (EP). By a limited oxygen index (LOI) measurement, UL94 vertical burning test and cone calorimeter test, TOD was observed to efficiently endow the EP thermoset with a higher LOI value, higher UL94 rating, and reduced total heat release in combustion. The introduction of 4 wt% TOD endowed the EP thermoset with a LOI value of 35.9%, UL94 V-0 rating, 42.4% decreased peak of heat release rate, 46.5% decreased total heat release, and slightly elevated char yields. The analyses of the thermal and combustion behaviors of the epoxy thermoset as well as the pyrolysis behavior of TOD together revealed that the free radical quenching effect, inert volatile diluting effect, charring effect, and char layer barrier jointly caused the high-efficiency flame retardant mechanism of TOD in the epoxy thermoset. This suggests a possibility to further improve the flame retardant efficiency of bi-or multi-group compounds by selecting proper bridge-linking between functional groups.

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“…However, a hybrid of GO with Ag NPs can give large background signals from the D and G bands of GO, which can limit their applications [49,50]. Therefore, GO was coated with a silica layer by the hydrolysis of tetraethylorthosilicate (TEOS) or (3-aminopropyl)-trimethoxysilane and applied as a thermally conducting material [51,52,53,54,55]; however, thin-silica-coated GO has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Silver Nanoparticle-Embedded Thin Silica-Coated Graphene Oxide as an SERS Substrate

et al. 2016

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A hybrid of Ag nanoparticle (NP)-embedded thin silica-coated graphene oxide (GO@SiO2@Ag NPs) was prepared as a surface-enhanced Raman scattering (SERS) substrate. A 6 nm layer of silica was successfully coated on the surface of GO by the physical adsorption of sodium silicate, followed by the hydrolysis of 3-mercaptopropyl trimethoxysilane. Ag NPs were introduced onto the thin silica-coated graphene oxide by the reduction of Ag+ to prepare GO@SiO2@Ag NPs. The GO@SiO2@Ag NPs exhibited a 1.8-fold enhanced Raman signal compared to GO without a silica coating. The GO@SiO2@Ag NPs showed a detection limit of 4-mercaptobenzoic acid (4-MBA) at 0.74 μM.

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Thermally conductive and electrically insulating epoxy nanocomposites with silica-coated graphene

Abstract: Graphene was coated with SiO2 nanoparticles by a sol–gel approach and the coated graphene sheets are efficient in improving the thermal conductivity of epoxy while retaining its electrical insulation.

Cited by 92 publications

References 32 publications

Graphene coated with alumina and its utilization as a thermal conductivity enhancer for alumina sphere/thermoplastic polyurethane composite

Graphene coated with alumina and its utilization as a thermal conductivity enhancer for alumina sphere/thermoplastic polyurethane composite

Flame-retardant effect of a novel phosphaphenanthrene/triazine-trione bi-group compound on an epoxy thermoset and its pyrolysis behaviour

Silver Nanoparticle-Embedded Thin Silica-Coated Graphene Oxide as an SERS Substrate

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