Free-standing graphene films embedded in epoxy resin with enhanced thermal properties

Bustero, Izaskun; Gaztelumendi, I.; Obieta, Isabel; Mendizabal, María Asun; Zurutuza, Amaia; Ortega, Amaya; Alonso, Beatriz

doi:10.1007/s42114-020-00136-6

Cited by 79 publications

(42 citation statements)

References 25 publications

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“…The incorporation of graphene into polymers allows increasing the thermal stability of polymer composite [16]. Higher specific area and aspect ratio of carbon nanofillers induce higher stability [17].…”

Section: Properties Of Nanocomposite Polymer Coatingsmentioning

confidence: 99%

“…This enhancement is also accompanied with an important increase of the low thermal conductivity of polymers. Very high enhancements have been reported, from 0.2 W/mK for neat epoxy coating to 20 W/mK for composite with 30% graphene [16]. Graphene is more effective nanofiller than CNT in order to enhance the thermal conductivity of polymer composites.…”

Section: Properties Of Nanocomposite Polymer Coatingsmentioning

confidence: 99%

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Smart Coatings with Carbon Nanoparticles

Sánchez–Romate¹,

Jiménez‐Suárez²,

Prolongo³

2020

21st Century Surface Science - A Handbook

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Smart coatings based on polymer matrix doped with carbon nanoparticles, such as carbon nanotubes or graphene, are being widely studied. The addition of carbon nanofillers into organic coatings usually enhances their performance, increasing their barrier properties, corrosion resistance, hardness, and wear strength. Moreover, the developed composites provide a new generation of protective organic coatings, being able to intelligently respond to damage or external stimuli. Carbon nanoparticles induce new functionalities to polymer coatings, most of them related to the higher electrical conductivity of nanocomposite due to the formation of percolation network. These coatings can be used as strain sensors and gauges, based on the variation of their electrical resistance (structural health monitoring, SHM). In addition, they act as self-heaters by the application of electrical voltage associated to resistive heating by Joule effect. This opens new potential applications, particularly deicing and defogging coatings. Superhydrophobic and self-cleaning coatings are inspired from lotus effect, designing micro-and nanoscaled hierarchical surfaces. Coatings with self-healable polymer matrix are able to repair surface damages. Other relevant smart capabilities of these new coatings are flame retardant, lubricating, stimuli-chromism, and antibacterial activity, among others.

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Section: Properties Of Nanocomposite Polymer Coatingsmentioning

confidence: 99%

Section: Properties Of Nanocomposite Polymer Coatingsmentioning

confidence: 99%

Smart Coatings with Carbon Nanoparticles

Sánchez–Romate¹,

Jiménez‐Suárez²,

Prolongo³

2020

21st Century Surface Science - A Handbook

View full text Add to dashboard Cite

show abstract

“…Because heat flows from the heat source to the heat sink through thermally conductive (TC) materials, the higher thermal conductivity TC materials have, the more efficiently the heat is dissipated [ 2 ]. In particular, carbon-based materials [ 3 ], such as carbon nanotubes (CNTs), graphene [ 4 , 5 , 6 , 7 , 8 ], and graphite [ 1 , 4 , 9 ], have been studied for thermal management due to their excellent thermal conductivity. However, polymer/carbon filler composites show rather low thermal conductivity because of the thermal resistance at the polymer/filler interfaces.…”

Section: Introductionmentioning

confidence: 99%

“…However, polymer/carbon filler composites show rather low thermal conductivity because of the thermal resistance at the polymer/filler interfaces. To minimize phonon scattering at the interfaces, a free-standing graphene film [ 10 , 11 ] was fabricated and embedded in a polymer matrix [ 5 ]. The thermal conductivity of the composite was increased by two orders of magnitude compared to that of polymer because the 2D structure of graphene connected by sp 2 hybridized carbon is advantageous for phonon transfer.…”

Section: Introductionmentioning

confidence: 99%

Thermally Conductive Film Fabricated Using Perforated Graphite Sheet and UV-Curable Pressure-Sensitive Adhesive

et al. 2021

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Thermally conductive films play a crucial role in expanding the lifetime of electronics by dissipating concentrated heat to heatsinks. In this work, a thermally conductive film (g-TC film) was manufactured using a perforated graphite sheet (p-GS) and a UV-curable pressure-sensitive adhesive (PSA) by lamination. A novel UV-curable PSA was prepared by incorporating a UV-curable abietic acid ester into a PSA composition. The UV-curable PSA became a tack-free film upon UV irradiation; thus, a flexible g-TC film with a 52-μm thickness was obtained. The defects in the g-TC film caused by air bubbles were removed by treating the p-GS with oxygen plasma. As the UV-cured PSA made a joint through the holes in the p-GS, cleavage of the graphite was not observed after 10,000 U-folding test cycles with a folding radius of 1 mm. The calculated in-plane thermal conductivity of the fabricated g-TC film was 179 W∙m−1K−1, which was stable after the U-folding tests.

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“…[1][2][3] These properties depend on the type of epoxy resin, curing agent, and curing conditions, and can also be modified by using appropriate fillers. For instance, the thermal conductivity of the epoxy matrix material 4,5 or magnetorheological properties 6 may be enhanced, and surface properties, [7][8][9] self-healing efficiency 10 or mechanical properties of epoxy composites 11 can be improved.…”

Section: Introductionmentioning

confidence: 99%

Analysis of curing of diglycidyl ether of bisphenol A (BADGE n = 0) with 2‐adamantylethanamine

Fraga

Válcarcel

Soto

et al. 2020

Polymers for Advanced Techs

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The epoxy resin diglycidyl ether of Bisphenol A (BADGE n = 0) has been cured with a new synthesized hardener (2‐adamantylethanamine) and the crosslinking reaction was characterized by DSC. Values of 413.3 J/g and 95°C have been obtained for the enthalpy of the reaction and the glass transition temperature, respectively. The experimental results obey Kamal's model over all conversion range of temperatures (70°C‐100°C). The activation energies of the mechanisms involved in the curing reaction have been determined for both the autocatalytic and the n‐order mechanism, the values being 63.3 and 29.8 kJ/mol, respectively. The value for Tg is 23°C higher than the one for (BADGE n = 0)/amantadine, while the activation energy for the n‐order mechanism is around 13 kJ/mol lower. This is consistent with a higher steric effect of the adamantyl group in the second hardener since it will hinder the opening the oxirane ring by the nitrogen atom of the amino group. As the polymerization reaction progress, this effect will disappear as the distance adamantyl‐oxirane increase when new oxirane groups react with the hydroxyl groups (autocatalyzed reaction). Consequently, by selecting the appropriate cross‐linking agent, it is possible to simultaneously increase Tg while reducing theactivation energy, two effects which may be desirable for some industrial applications of the material.

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Free-standing graphene films embedded in epoxy resin with enhanced thermal properties

Cited by 79 publications

References 25 publications

Smart Coatings with Carbon Nanoparticles

Smart Coatings with Carbon Nanoparticles

Thermally Conductive Film Fabricated Using Perforated Graphite Sheet and UV-Curable Pressure-Sensitive Adhesive

Analysis of curing of diglycidyl ether of bisphenol A (BADGE n = 0) with 2‐adamantylethanamine

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