3D Graphene – sponge skeleton reinforced polysulfide rubber nanocomposites with improved electrical and thermal conductivity

Tao, W. J.; Zeng, Shaohua; Xu, Ying; Nie, Wangyan; Zhou, Yifeng; Qin, Pengbo; Wu, Shaohang; Chen, Pengpeng

doi:10.1016/j.compositesa.2021.106293

Cited by 33 publications

(14 citation statements)

References 64 publications

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“…The impedance ( Z ) data of PMMA/Ni@GNP composites were tested on a broadband dielectric impedance spectrometer. As is known, impedance is composed of resistance, capacitance, and inductance of the sample, which is also the embodiment of the conductivity of a sample . As shown in Figure b, the impedance of neat PMMA (i.e., sample S0) was the largest under AC electric fields and those of the composites decreased with the increase in the filler content, which was consistent with the previous DC conductivity testing results.…”

Section: Resultssupporting

confidence: 88%

“…As shown in Figure b, the impedance of neat PMMA (i.e., sample S0) was the largest under AC electric fields and those of the composites decreased with the increase in the filler content, which was consistent with the previous DC conductivity testing results. In general, resistance contribution to impedance is the greatest at low frequencies, while inductance contribution to impedance increases as the frequency increases . The impedances of samples S0 and S1 displayed strong dependence on the frequency, and the impedance decreased with the increase in frequency.…”

Section: Resultsmentioning

confidence: 89%

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Enhanced Thermally Conductive and Microwave Absorbing Properties of Polymethyl Methacrylate/Ni@GNP Nanocomposites

Yang

Jia

et al. 2021

Ind. Eng. Chem. Res.

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In this work, Ni@GNP nanohybrids fabricated via an in situ reduction method were incorporated into polymethyl methacrylate (PMMA) to prepare PMMA/Ni@GNP nanocomposites via solution blending and hot-pressing. The Ni nanoparticles with an average diameter of 70–80 nm were observed to successfully grow on the GNP surface via SEM and TEM. Both thermally conductive and microwave absorbing properties of the prepared composites were intensively investigated. A reflection loss test experimentally suggested that the PMMA/Ni@GNP composites showed a good microwave absorbing property, among which the composite containing 30 wt % Ni@GNP displayed the best microwave absorption performance (with a value of −30 dB for RL min in the C band). The thermal conduction behavior of the composites was jointly studied by infrared thermal imaging (ITI) and enthalpy transformation method together with a four-parameter model. The average heating rate during an initial stage was obviously found to increase from 65.4 to 103.2 °C/min, indicating that a well-defined heat conduction network gradually formed in the composites, which exerted positive influence on heat conduction. The composites generally bore perfect thermal conductivities (e.g., with a maximum in-plane thermal conductivity of 9.02 W/m·K and a maximum out-of-plane value of 1.29 W/m·K), and the variations of thermal conductivity versus filler loading should be attributed to the construction of an anisotropically thermally conductive network in the composites. The PMMA/Ni@GNP composites with desirable microwave absorption and thermal conductivity would find potential applications in 5G communication devices.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 89%

Enhanced Thermally Conductive and Microwave Absorbing Properties of Polymethyl Methacrylate/Ni@GNP Nanocomposites

Yang

Jia

et al. 2021

Ind. Eng. Chem. Res.

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“…The dielectric performance of composites is closely related to interfacial polarization, dipolar polarization, and the minicapacitor principle. , The incorporation of Mt and MWCNTs with the relatively high dielectric performance can produce many minicapacitors within the epoxy matrix, which increase the D k values of epoxy composites. The aliphatic amines with the appropriate alkyl chain lengths and secondary amine numbers can improve the exfoliation state of Mt and the dispersion state of MWCNTs synchronously, finally increasing the formation probability of highly connected 3D MWCNT networks in composites.…”

Section: Resultsmentioning

confidence: 99%

Layered Montmorillonite/3D Carbon Nanotube Networks for Epoxy Composites with Enhanced Mechanical Strength and Thermal Properties

Tang

Zhang

Guo

et al. 2022

ACS Appl. Nano Mater.

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Because of their excellent thermal conductivities and high aspect ratios, carbon nanotubes (CNTs) exhibit great potential for use in microelectronic packaging. However, for their application in insulating materials, the high electroconductibility and poor radial conductivity of CNTs significantly limit their loading. In this work, a heterostructured “brushlike” hybrid was first prepared by anchoring aliphatic amine-functionalized multiwalled carbon nanotubes (MWCNTs) onto the insulating montmorillonite (Mt). The morphological characterizations of the heterostructured MWCNTs–Mt hybrids and epoxy composites were examined, revealing that a three-dimensional (3D) thermal conduction network within the matrix was constructed under the geometrical constraints of layered Mt. The synergistic effect of MWCNTs and Mt on the enhanced thermal conductivity and mechanical and thermal properties of the obtained composites was systematically established. The results showed that the thermal conductivity of MWCNTs–Mt/epoxy composites was significantly improved with the 0.5 wt % loading of hybrids, about 61% higher than that of pure epoxies; simultaneously, the dielectric loss of such composites was lower than that of pure epoxies at low frequencies, although the dielectric constant increased. Moreover, the mechanical properties and thermal stability of these composites were synchronously enhanced. This work provides a promising strategy for fabricating polymer composites with relatively high thermal conductivity, low dielectric loss, and excellent thermal stability and mechanical properties.

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“…In order to eliminate the influence of the graphene content on λ, the thermal conductivity enhancement equation was used to express the thermal conductivity efficiency (λ e ) when adding 1 vol % or 1 wt % of the thermally conductive filler, as follows where λ is the thermal conductivity of the composites, λ m is the thermal conductivity of the matrix, and w f represents the mass fraction of the filler . In this work, the λ e values of EP 2 /GA composites were compared with other graphene-based nanocomposites in the literatures, − as shown in Figure . EP 2 /GA composites in our work exhibited a higher λ e value (409%).…”

Section: Resultsmentioning

confidence: 99%

Design of Intrinsically Flame-Retardant Vanillin-Based Epoxy Resin for Thermal-Conductive Epoxy/Graphene Aerogel Composites

Yang

Ding

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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Vanillin, as a lignin-derived mono-aromatic compound, has attracted increasing attention due to its special role as an intermediate for the synthesis of different biobased polymers. Herein, intrinsically flame-retardant and thermalconductive vanillin-based epoxy/graphene aerogel (GA) composites were designed. First, a bifunctional phenol intermediate (DN-bp) was synthesized by coupling vanillin with 4, 4′-diaminodiphenylmethane and DOPO, and the epoxy monomer (MEP) was obtained by the epoxidation reaction with DN-bp and epichlorohydrin. Then, various amounts of MEP and diglycidyl ether of bisphenol A (DER) were mixed and cured. Interestingly, the flexural strength and modulus were greatly enhanced from 72.8 MPa and 1.3 GPa to 90.3 MPa and 2.8 GPa, respectively, at 30 wt % MEP, due to the rigidity of MEP and strong intermolecular N−H hydrogen bonding interactions. Meanwhile, the cured epoxy achieved a UL-94 V0 rating with a low P content of 1.06%. The flame-retardant vanillin-based epoxy was then impregnated into the thermal conductive 3D GA networks. The obtained epoxy/graphene composite showed excellent flame retardancy and thermal conductivity [λ = 0.592 W/(m•K)] with only 0.5 wt % graphene in the system. Based on these results, we believe that this work would represent a novel solution for the preparation of high-performance biobased flameretardant multipurpose epoxies.

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3D Graphene – sponge skeleton reinforced polysulfide rubber nanocomposites with improved electrical and thermal conductivity

Cited by 33 publications

References 64 publications

Enhanced Thermally Conductive and Microwave Absorbing Properties of Polymethyl Methacrylate/Ni@GNP Nanocomposites

Enhanced Thermally Conductive and Microwave Absorbing Properties of Polymethyl Methacrylate/Ni@GNP Nanocomposites

Layered Montmorillonite/3D Carbon Nanotube Networks for Epoxy Composites with Enhanced Mechanical Strength and Thermal Properties

Design of Intrinsically Flame-Retardant Vanillin-Based Epoxy Resin for Thermal-Conductive Epoxy/Graphene Aerogel Composites

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