Electrical conductivity and<scp>EMI</scp>shielding effectiveness of polyurethane foam–conductive filler composites

Kim, Ji Mun; Lee, Yeongbeom; Jang, Myung Geun; Han, Chonghun; Kim, Woo Nyon

doi:10.1002/app.44373

Cited by 45 publications

(32 citation statements)

References 45 publications

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“…Different types of fillers and nanofillers, such as cellulose and lignocellulosic fibers [ 138 , 139 ], glass wool, glass microspheres or glass fibers [ 180 , 181 , 182 ], egg shell wastes [ 140 ], date palm particles [ 141 ], walnut and hazelnut shells [ 142 ], and esparto wool [ 143 ], just to mention a few, can be used to improve the structural and mechanical properties of PUFs. Despite having a significant effect on the thermal and electrical properties, materials such as carbon nanotubes (CNTs) [ 183 , 184 , 185 , 186 ], graphene [ 187 , 188 , 189 , 190 ], EG [ 35 ], carbon nanofibers (CNFs) [ 191 ], or inorganic fillers, such as Fe 3 O 4 [ 192 ], TiO 2 [ 193 ], and iron oxide [ 194 ] are also commonly used to improve the structural and mechanical properties of the foams.…”

Section: Polyurethane Foams Applications and Enhancement Of Propermentioning

confidence: 99%

“…In that sense, carbon-based nanoparticles such as EG, CNTs, graphene, and carbon black have attracted increasing interest due to their inherently high mechanical and physical properties [ 179 ]. The incorporation of these particles in PUFs has been known to enhance their mechanical performance [ 35 , 127 , 187 , 202 ]. Nowadays, due to their lower price, CNTs or graphene have been used in many applications.…”

Section: Polyurethane Foams Applications and Enhancement Of Propermentioning

confidence: 99%

“…To enhance these properties, different fillers can be used. Ji Mun Kim et al [ 187 ] studied the electrical conductivity and EMI-shielding effectiveness of rigid PUFs filled with nickel-coated carbon fiber (3.0 php), and reported that the composite showed higher electrical conductivity and electromagnetic interference-shielding effectiveness. CNTs have excellent mechanical, physical, thermal, and electrical properties, so they are excellent candidates for improving the electrical properties of PUFs.…”

Section: Polyurethane Foams Applications and Enhancement Of Propermentioning

confidence: 99%

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Polyurethane Foams: Past, Present, and Future

2018

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Polymeric foams can be found virtually everywhere due to their advantageous properties compared with counterparts materials. Possibly the most important class of polymeric foams are polyurethane foams (PUFs), as their low density and thermal conductivity combined with their interesting mechanical properties make them excellent thermal and sound insulators, as well as structural and comfort materials. Despite the broad range of applications, the production of PUFs is still highly petroleum-dependent, so this industry must adapt to ever more strict regulations and rigorous consumers. In that sense, the well-established raw materials and process technologies can face a turning point in the near future, due to the need of using renewable raw materials and new process technologies, such as three-dimensional (3D) printing. In this work, the fundamental aspects of the production of PUFs are reviewed, the new challenges that the PUFs industry are expected to confront regarding process methodologies in the near future are outlined, and some alternatives are also presented. Then, the strategies for the improvement of PUFs sustainability, including recycling, and the enhancement of their properties are discussed.

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Section: Polyurethane Foams Applications and Enhancement Of Propermentioning

confidence: 99%

Section: Polyurethane Foams Applications and Enhancement Of Propermentioning

confidence: 99%

Section: Polyurethane Foams Applications and Enhancement Of Propermentioning

confidence: 99%

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Polyurethane Foams: Past, Present, and Future

2018

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“…Effects of liquid‐type additives such as PFA, HMDS, or MWCNT/PFA hybrid additives for the improvement of the sound absorption properties of flexible PUF have not yet been reported. Recent studies of PUF with MWCNT composites suggested that a small amount of MWCNTs in the polyurethane matrix may yield copious bubble nucleation by reducing the critical activation energy for nucleation. As a result, the MWCNT particles effectively reduced the cell size of the PUF, decreasing the thermal conductivity of the PUF.…”

Section: Introductionmentioning

confidence: 99%

Effects of multiwall carbon nanotube and perfluoroalkane additives on the sound absorption properties of flexible polyurethane foams

Ryu

Kim

et al. 2017

Polymer Composites

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The sound absorption properties and airflow resistivity of polyurethane foams (PUFs) with multiwall carbon nanotube (MWCNT), perfluoroalkane (PFA), dimethylsiloxane (HMDS), and MWCNT/PFA hybrid additives were investigated with varying additive content. The results show the close relationship of the sound absorption coefficient and airflow resistivity, and increasing flow resistivity was found to improve the sound absorption coefficient of the PUF. For the PUF with MWCNT (at 0.50 phr)/PFA (at 1.25 phr) hybrid additives, the sound absorption coefficient and airflow resistivity were 0.80 (in the frequency range of 1,600–2,500 Hz) and 439,900 Ns/m4, respectively, which were the highest values among the investigated additive species and additive content. The sound absorption coefficient of the PUF with MWCNT (at 0.50 phr)/PFA (at 1.25 phr) was increased by 82.0% compared to that of the PUF without additives, probably because the PUF has the smallest cell size among the additive species and compositions investigated in this study. The results of the sound absorption coefficient, airflow resistivity, and cell size of the PUF suggest that to decrease the cell size and to increase the tortuous paths of the foams, MWCNT/PFA hybrid additives appeared to be the most effective additives and showed synergistic effects in the formation of PUF, and its small cell size increased the sound absorption properties of PUF. POLYM. COMPOS., 39:E1087–E1098, 2018. © 2017 Society of Plastics Engineers

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“…In recent years, conductive polyurethane composite foams have attracted more and more interest due to their low density and thermal insulation properties. Moreover, these materials are particularly interesting for their effectiveness in shielding electromagnetic interference, which allows their use in electronic devices where electromagnetic emissions can interfere with the operation of neighboring electronic equipment …”

Section: Introductionmentioning

confidence: 99%

Blast furnace slag or fly ash filled rigid polyurethane composite foams: A comprehensive investigation

Akkoyun

2019

J of Applied Polymer Sci

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Ground granulated blast furnace slag (BFS) and fly ash (FA) are iron-making industry and power plant byproducts, respectively. Although their use in concrete is quite common, investigation of the effects of these inorganic compounds on polymer properties is quite new, and their use as fillers in polymer foam composites has not yet been really explored. Their properties, such as high electrical resistivity, make them a good asset for use in rigid polyurethane foams that are widely used for insulation. In this study, a comprehensive investigation of the effect of BFS and FA on morphology, electrical and thermal conductivity, and rheological and mechanical properties of water-blown rigid polyurethane foams was performed. The relationship between these properties was examined. A relative enhancement of the properties is observed for filled foams, especially up to the percolation threshold. The results highlight a noticeable effect of the electrical percolation threshold on the different properties of foams.

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Electrical conductivity andEMIshielding effectiveness of polyurethane foam–conductive filler composites

Cited by 45 publications

References 45 publications

Polyurethane Foams: Past, Present, and Future

Polyurethane Foams: Past, Present, and Future

Effects of multiwall carbon nanotube and perfluoroalkane additives on the sound absorption properties of flexible polyurethane foams

Blast furnace slag or fly ash filled rigid polyurethane composite foams: A comprehensive investigation

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