Lightweight and Flexible Reduced Graphene Oxide/Water-Borne Polyurethane Composites with High Electrical Conductivity and Excellent Electromagnetic Interference Shielding Performance

Hsiao, Sheng-Tsung; Chen‐Chi, M.; Liao, Wei-Hao; Wang, Yusheng; Li, Shin-Ming; Huang, Yumeng; Yang, Ruey‐Bin; Liang, Wei

doi:10.1021/am502412q

Cited by 225 publications

(108 citation statements)

References 51 publications

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“…Herein, noncovalently functionalized MWCNT dispersion, and WPU emulsion, which have the advantages of nontoxicity, nonflammability, nonvolatility and available application of polyurethane with good flexibility in an aqueous medium, are mixed and poured into designed mould followed by freeze‐drying process to get the porous composites with various shapes or sizes ( Figure a). The freezing method resulted from large temperature gradient between the bottom and top of the MWCNT/WPU mixed solution is adopted and leads to the formation and unidirectional growth of ice crystals from the bottom to upper face (Figure S1c, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Lightweight and Anisotropic Porous MWCNT/WPU Composites for Ultrahigh Performance Electromagnetic Interference Shielding

Zeng

Jin

Chen

et al. 2015

Adv Funct Materials

752

432

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303wileyonlinelibrary.com EMI SE reveals the ability of materials to attenuate electromagnetic waves and is generally expressed in decibel (dB). [ 11,12 ] For the applications that need lightweight shielding materials, however, the specifi c SE (SSE), which is defi ned as SE divided by mass density, is also a crucial criterion. [ 8 ] In porous CPCs, the air bubbles arise in the material and thus the mass density is reduced. If conductive networks are formed therein by the electric fi llers with large aspect ratios, such as carbon fi bers (CFs), carbon nanotubes (CNTs), or graphene layers, it will lead to high electrical conductivity in addition to the low density, [ 9,13,14 ] which are benefi cial to higheffi ciency EMI shielding. [ 10,[15][16][17][18][19][20] In consideration of that, Yang et al. reported porous CPC-based EMI shielding material of 15 wt% carbon nanofi ber/ polystyrene (PS) composite foams with SE ≈19 dB in the frequency range of 8.2-12.4 GHz (X-band), [ 16 ] and 7 wt% CNT/PS porous composite fabricated with the aid of chemical blowing agents obtained SE ≈19 dB at a density of 0.56 g cm −3 .[ 17 ] Those porous CPCs indicate higher utilization of materials than typical metal-based shields, as SSE is 33.1 dB cm 3 g −1 for 7 wt% CNT/PS composite foams [ 17 ] and 16-25 dB cm 3 g −1 for 5 wt% porous graphene/polymethylmethacrylate (PMMA) composites, [ 18 ] higher than that of solid copper ≈10 dB cm 3 g −1.[ 21 ] To obtain higher SSE, various preparation methods of CPC-based foams are developed to further decrease the density or improve the SE at similar thickness. Zheng group [ 20 ] reported a facile phase separation method to fabricate lightweight microcellular graphene/polyetherimide (PEI) and graphene@Fe 3 O 4 /PEI composites with density near 0.3 g cm −3 and SSE ≈40 dB cm 3 g −1 at 2.3-2.5 mm thickness. Yan et al. fabricated porous graphene/ PS composites with density of 0.27 and 0.45 g cm −3 by a combination of high-pressure compression molding and salt-leaching method, and the SSE was as large as 64.4 dB cm 3 g −1 in the X-band at 2.5 mm thickness, due to successful preparation of low-density porous composites with the loading of graphene as high as 30 wt%. [ 10 ] However, SE of those porous composites are still not high enough when the densities are relatively low, and SSE of those CPC-based foams are limited at similar thickness.For a certain thickness, improving the conductivities of CPCs is an effective way to improve SE by increasing the loadings of electric fi llers with high conductivity. Nevertheless, the conductive network in the matrix will inevitably be impaired in the foaming process and results in a lower conductivity

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Section: Resultsmentioning

confidence: 99%

Lightweight and Anisotropic Porous MWCNT/WPU Composites for Ultrahigh Performance Electromagnetic Interference Shielding

Zeng

Jin

Chen

et al. 2015

Adv Funct Materials

752

432

View full text Add to dashboard Cite

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“…[21][22][23] Young's modulus and the ultimate strength of graphene was measured to be about 1.1 TPa and 130 GPa, respectively. 24 Graphene is less expensive and easier to manufacture compared to CNTs.…”

Section: Introductionmentioning

confidence: 99%

Improving the mechanical, electrical, and thermal properties of polyimide by incorporating functionalized graphene oxide

Wang

Lan

et al. 2016

High Performance Polymers

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In this study, we have developed a facile and effective method for fabricating polyimide (PI)-based nanocomposites incorporating octadecylamine (ODA)-functionalized graphene oxide (ODA-fGO) nanosheets. ODA-fGO sheets exhibit superior dispersibility and compatibility with the PI matrix and are successfully obtained through a chemical reaction between graphene oxide (GO) and ODA. The PI-based composites of various loading content of ODA-fGO sheets were prepared via in situ polymerization and thermal imidization process. The mechanical and electrical properties of the PI/ ODA-fGO composites were significantly improved relative to pure PI because of the excellent dispersion of ODA-fGO and the adequate compatibility between fillers and the PI matrix. A 40.7% increase in tensile strength and a 95.5% improvement of Young's modulus were observed for the 3 wt% ODA-fGO (PI/3 wt% ODA-fGO) loading content composite. The electrical and thermal conductivity of PI/3 wt% ODA-fGO was 3.8 Â 10 À2 S m À1 and 0.468 W m À1 K À1 , respectively, which is more than 10 11 times and almost 3 times higher than that of pure PI. The reported approach provides an effective strategy for developing high-performance and multifunctional polymer-based composite materials.

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“…For now, the two types of materials are used to fabricate the electromagnetic shielding materials, the metal/metal-based materials and polymer-based materials [3]. The metal materials exhibit the strong ability to reflect the electromagnetic wave owing to their low electrical resistivity, whereas the shortcoming of easy corrosion largely degrades the EMI SE [4]. The polymer-based materials are considered to be promising EMI materials due to the resistance to corrosion, low cost, light weight, easy processing etc.…”

Section: Introductionmentioning

confidence: 99%

Elevated conductivity and electromagnetic interference shielding effectiveness of PVDF/PETG/carbon fiber composites through incorporating carbon black

et al. 2015

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Along with the electronic products entering people's life, the electromagnetic radiation is becoming a serious problem threatening human health. Consequently, the aim of this paper is fabricating the electromagnetic shielding materials containing carbon fiber (CF), carbon black (CB), poly(vinylidene fluoride) (PVDF) and poly(ethylene terephthalateco-1,4-cylclohexylenedimethylene terephthalate) (PETG). By adjusting CB content, the composite with high electromagnetic interference shielding effectiveness (EMI SE) was achieved. Additionally, the effects of CB on the rheological, dynamic mechanical properties, and electrical resistivity of PVDF/PETG/CF composites were investigated in detail. That CB formed the conductive networks in the PVDF/PETG/CF/CB composite at 5 % of CB and above led to the reduction in electrical resistivity and the augment of the modulus as well as the glass transition temperature of PETG. From the electrical resistivity and storage modulus points of view, the short CF exhibited the better synergistic effect with CB than the long CF did. But the lowest electrical resistivity (0.39 Ω.cm) occurred in the long CF based composites containing 15 % of CB, and its EMI SE is determined to above 30 dB over a frequency of 0.1 to 1500 MHz.

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Lightweight and Flexible Reduced Graphene Oxide/Water-Borne Polyurethane Composites with High Electrical Conductivity and Excellent Electromagnetic Interference Shielding Performance

Cited by 225 publications

References 51 publications

Lightweight and Anisotropic Porous MWCNT/WPU Composites for Ultrahigh Performance Electromagnetic Interference Shielding

Lightweight and Anisotropic Porous MWCNT/WPU Composites for Ultrahigh Performance Electromagnetic Interference Shielding

Improving the mechanical, electrical, and thermal properties of polyimide by incorporating functionalized graphene oxide

Elevated conductivity and electromagnetic interference shielding effectiveness of PVDF/PETG/carbon fiber composites through incorporating carbon black

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