Roles of silica-coated layer on graphite for thermal conductivity, heat dissipation, thermal stability, and electrical resistivity of polymer composites

Kim, Yeongseon; Kim, Minjae; Seong, Honggyu; Jung, Ji Young; Baeck, Sung‐Hyeon; Shim, Sang Eun

doi:10.1016/j.polymer.2018.06.056

Cited by 35 publications

(27 citation statements)

References 30 publications

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“…Polymers are extensively used in various applications because of their wide range of properties. Filler materials, such as carbon black (CB), silica, and clay, are often added to polymers to produce composites with tailored physical and mechanical properties, such as strength, dimensional stability, surface hardness, thermal stability, and electrical conductivity, while reducing their cost. In order for the polymer composite to achieve the properties required for a particular application, the filler material must have the appropriate morphology, particle size distribution, surface characteristics, and dispersion capability in the polymer matrix .…”

Section: Introductionmentioning

confidence: 99%

Thermal and mechanical enhancement of styrene–butadiene rubber by filling with modified anthracite coal

Tan

Hong-zhi

Wei

et al. 2019

J of Applied Polymer Sci

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Anthracite is the highest rank of coal with a layered structure similar to that of graphite. Here, styrene-butadiene rubber/modified anthracite (MA) composites were prepared and analyzed. The microstructure and dispersion of the anthracite were improved by ball milling with the modifier bis-(γ-triethoxysilylpropyl)-tetrasulfide (KH-Si69). The particle size of the modified coal was decreased significantly tõ 3 μm, while surface interactions with the modifier yielded enhanced lamellar morphology and hydrophobic surfaces. The anthracite lamellae were well dispersed in the rubber matrix, providing good reinforcement; the tensile strength of the composite exceeded that of a composite with carbon black (CB) N660 filler (16.65 vs. 14.68 MPa). Moreover, low-level CB or silica compositing further promoted the dispersion of coal particles in the rubber, effectively enhancing the mechanical reinforcement behavior of the coal particles as well as the thermal stability of the rubber composite. Notably, it led to a 10.63% improvement in tensile strength and a 9.96 C increase in the 5% mass loss temperature compared to the composite with a single MA filler.

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Section: Introductionmentioning

confidence: 99%

Thermal and mechanical enhancement of styrene–butadiene rubber by filling with modified anthracite coal

Tan

Hong-zhi

Wei

et al. 2019

J of Applied Polymer Sci

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“…At 10 vol.% GNP loading, κ c was higher using high a , indicating reduction in the thermal contact resistance because of the large lateral dimension. Kim et al [ 117 ] studied the use of silica-coated graphite and silica-graphite hybrid fillers to improve κ c of HDPE composite. They proposed a scheme of phonon conduction paths and filler-filler interfacial resistance embedded in the polymer matrix, as shown in Figure 13 .…”

Section: Thermal Conductivity Of Polyolefin Compositesmentioning

confidence: 99%

“… Electron-blocking effect and interfacial thermal resistance (ITR) in the composites in terms of filler types: (a) raw, (b) hybrid, and coated fillers with size of (c) 12, (d) 23, (e) 100 µm. ‘Reprinted from Ref [ 117 ]. Copyright (2018), with permission from Elsevier’ …”

Section: Thermal Conductivity Of Polyolefin Compositesmentioning

confidence: 99%

Thermally enhanced polyolefin composites: fundamentals, progress, challenges, and prospects

Chaudhry

Mabrouk

Abdala

2020

Science and Technology of Advanced Materials

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The low thermal conductivity of polymers is a barrier to their use in applications requiring high thermal conductivity such as electronic packaging, heat exchangers, and thermal management devices. Polyolefins represent about 55 percent of global thermoplastic production, and therefore improving their thermal conductivity is essential for many applications. This review analyzes the advances in enhancing the thermal conductivity of polyolefin composites. First, the mechanisms of thermal transport in polyolefin composites and the key parameters that govern conductive heat transfer through the interface between the matrix and the filler are discussed. Then the advantage with different thermally conductive fillers are reviewed and analyzed. Finally, the key challenges and future directions for developing thermally enhanced polyolefin composites are outlined.

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“…The soft segments are polyethers with a rather low glass transition temperature, such as poly(tetramethylene glycol) (PTMG) [5], poly(tetramethylene oxide) (PTMO) [6] and poly(ethylene glycol) (PEG) [7], to ensure flexibility, ductility and elasticity. TPEE Polymers 2019, 11,1983 3 of 16 They found that in-situ fibrillated PTFE could increase the solubility of CO 2 in the blend and provide strain-induced hardening behavior in the foaming process, which can increase cell density and stabilize the existing cells. Huang et al found that fibrillated PTFE altered the viscoelastic properties and improved the foaming property of TPU/PTFE composites in foam injection-molding [29].…”

Section: Introductionmentioning

confidence: 99%

“…To overcome this shortcoming, many attempts have been made to further improve the mechanical properties or to lower the weight (i.e., material consumption). Blending the matrix with micro-sized particles is an efficient method to improve the thermal or mechanical properties of TPEE [9][10][11][12][13]. Paszkiewicz et al [12] added carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) to poly(trimethylene terephthalate) (PTT)-based TPEE to improve the electrical conductivity.…”

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confidence: 99%

Improving the Continuous Microcellular Extrusion Foaming Ability with Supercritical CO2 of Thermoplastic Polyether Ester Elastomer through In-Situ Fibrillation of Polytetrafluoroethylene

Jiang

Liu

et al. 2019

Polymers

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In-situ fibrillated polytetrafluoroethylene (PTFE) enhanced nanocomposites were successfully prepared by mixing thermoplastic polyether ester elastomer (TPEE) and PTFE using a twin-screw extruder. Well-dispersed, long aspect ratio PTFE nanofibrils with a diameter of less than 200 nm were generated and interwoven into networks. Differential scanning calorimetry and in-situ polarized optical microscopy showed that the PTFE nanofibrils can greatly accelerate and promote crystallization of the TPEE matrix and the crystallization temperature can be increased by 6 • C. Both shearing and elongational rheometry results confirmed that the introduction of PTFE nanofibrils can significantly improve the rheological properties. The remarkable changes in the strain-hardening effect and the melt viscoelastic response, as well as the promoted crystallization, led to substantially improved foaming behavior in the continuous extrusion process using supercritical CO 2 as the blowing agent. The existing PTFE nanofibrils dramatically decreased the cell diameter and increased cell density, together with a higher expansion ratio and more uniform cell structure. The sample with 5% PTFE fibrils showed the best foaming ability, with an average diameter of 10.4-14.7 µm, an expansion ratio of 9.5-12.3 and a cell density of 6.6 × 10 7 -8.6 × 10 7 cells/cm 3 .2 of 16 has many excellent properties including thermal stability, good elasticity, chemical and oil resistance and, especially, rebound resilience at low-temperatures [3,5]. Also, TPEE has higher tear and impact strengths over a broad range of service temperatures when compared with other traditional TPEs [8]. Because of the extraordinary performance of TPEE, it has attracted increasing interest from many fields such as the sports, automotive and military industries.Although TPEE is an attractive engineering material, its application has to overcome the exorbitant price. To overcome this shortcoming, many attempts have been made to further improve the mechanical properties or to lower the weight (i.e., material consumption). Blending the matrix with micro-sized particles is an efficient method to improve the thermal or mechanical properties of TPEE [9][10][11][12][13]. Paszkiewicz et al. [12] added carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) to poly(trimethylene terephthalate) (PTT)-based TPEE to improve the electrical conductivity. They found that CNTs had greater potential to improve electrical conductivity when compared to GNPs due to the higher purity and higher aspect ratio. Qiu et al. [13] controlled the structure of mixed filler particles in TPEE to enhance the mechanical properties. The results showed that a closely packed particle structure can significantly improve the yield strength by about 40% with a decrease of about 20% in the Young's modulus, which is preferred in TPEE used as an elastomer.Foaming is a very effective way to lower the weight and expand the application of polymers. In recent decades, foamed materials have exhibited a balance between price and...

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Roles of silica-coated layer on graphite for thermal conductivity, heat dissipation, thermal stability, and electrical resistivity of polymer composites

Cited by 35 publications

References 30 publications

Thermal and mechanical enhancement of styrene–butadiene rubber by filling with modified anthracite coal

Thermal and mechanical enhancement of styrene–butadiene rubber by filling with modified anthracite coal

Thermally enhanced polyolefin composites: fundamentals, progress, challenges, and prospects

Improving the Continuous Microcellular Extrusion Foaming Ability with Supercritical CO2 of Thermoplastic Polyether Ester Elastomer through In-Situ Fibrillation of Polytetrafluoroethylene

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