Flexible and densified graphene/waterborne polyurethane composite film with thermal conducting property for high performance electromagnetic interference shielding

Yang, Wang; Bai, Hengxuan; Jiang, Bo; Wang, Chaonan; Ye, Weimin; Li, Zhengxuan; Xu, Chong; Wang, Xiaobai; Li, Yongfeng

doi:10.1007/s12274-022-4414-3

Cited by 41 publications

(16 citation statements)

References 50 publications

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“…Moreover, 20%BC had a stable normalized electrical resistance ( R / R 0 ) after repeated 180° folding for 5000 times due to the excellent flexibility, which resulted in an essentially identical EMI SE T (Figure e), demonstrating the long endurance of EMI shielding capability. It was clear from Figure f and Table S3 that 20%BC exhibited a high specific SE value (SSE/t, defined as EMI SE/density/thickness) of 8860 ± 400 dB·cm 2 /g with a thickness of only 38 ± 1 μm, which was superior to most recently reported EMI shielding materials. ,,,,,− …”

Section: Resultsmentioning

confidence: 81%

Bacterial-Cellulose-Reinforced Graphite Nanoplate Films for Electromagnetic Interference Shielding, Heat Conduction, and Joule Heating

Fan

Song

et al. 2023

ACS Appl. Nano Mater.

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With the flourishing development of wireless communication, there is an urgent need for flexible and robust materials with excellent thermal conductivity (TC) and electromagnetic interference (EMI) shielding performance through simple and green preparation. In this work, we efficiently prepared bacterial-cellulose-reinforced graphite nanoplate (BC-GNP) composite films by the vacuum filtration of BC/GNP mixture dispersions. Compared with the pure GNP film with a loose and disordered structure, the BC-GNP composite showed a highly aligned and compact “brick-and-mortar” structure. Benefiting from the unique structure, the resultant BC-GNP with 20 wt % BC (20%BC) exhibited a high tensile strength of 47.3 ± 1.8 MPa and an electrical conductivity of 76.9 ± 3.3 S/cm. As expected, the 20%BC showed excellent EMI shielding effectiveness (EMI SE) of 36.4 dB and a specific EMI SE (SSE/t) value of 8860 ± 400 dB·cm2/g with a thickness of 38 ± 1 μm. The in-plane TC and anisotropy index could reach up to 80.2 ± 6.4 W/mK and 73 ± 3, respectively. The 20%BC also exhibited a satisfactory Joule heating performance of 139 °C at a voltage of 6 V. More importantly, the 20%BC possessed a biodegradable property, which would completely degrade after 5 days. Thus, this work provides a strategy to facilely prepare biodegradable, high-performance, and multifunctional materials for wearable devices.

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Section: Resultsmentioning

confidence: 81%

Bacterial-Cellulose-Reinforced Graphite Nanoplate Films for Electromagnetic Interference Shielding, Heat Conduction, and Joule Heating

Fan

Song

et al. 2023

ACS Appl. Nano Mater.

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“…The RGO/leather with high content of RGO is characterized by high electrical conductivity and a hierarchical conductive network, leading to the increase of multiple internal reflections and absorption of incident EM waves, which increases the EMI SE T values. 36 Then, the EMI shielding efficiency of RGO/leather is also calculated and shown in Fig. 4b.…”

Section: Resultsmentioning

confidence: 99%

Multi-functional graphene/leather for versatile wearable electronics

Guo

Chen

et al. 2023

J. Mater. Chem. A

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“…In the case of WPU currently being researched, not only petroleum-based diols, diisocyanates, and chain extenders, but also catalysts and viscosity modifiers harmful to the human body have been used as raw materials in the synthesis process, which are not environmentally friendly. In addition, the properties such as low mechanical strength and toughness of WPU are being discussed as main obstructions [ 12 , 13 ], and recently, research on the incorporation of fillers including graphite, carbon nanotubes (CNTs), and inorganic particles to improve them has been conducted [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

In Situ Synthesis of Environmentally Friendly Waterborne Polyurethane Extended with Regenerated Cellulose Nanoparticles for Enhanced Mechanical Performances

Choi

Lee

et al. 2023

Polymers

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The development of waterborne polyurethane (WPU) has been stimulated as an alternative to solvent-based polyurethanes due to low-VOC alternatives and reduced exposure to solvents. However, their relatively low mechanical performance and degradation have presented challenges in their wide application. Here, we developed environmentally-friendly bio polyol-based WPU nanocomposite dispersions and films, and presented the optimal process conditions for their manufacture. Additionally, the condition was established without using harmful catalysts or ethyl methyl ketone (MEK) during the polymerization. Moreover, regenerated cellulose nanoparticles (RCNs) were employed as natural chain-extenders in order to improve the biodegradability and mechanical performances of the nanocomposite films. The RCNs have a lower crystallinity compared to cellulose nanocrystals (CNCs), allowing them to possess high toughness without interfering with the elastomeric properties of polyurethane. The prepared CWPU/RCNs nanocomposite films exhibited high toughness of 58.8 ± 3 kgf∙mm and elongation at break of 240 ± 20%. In addition, depending on the molar ratio of NCO/OH, the polyurethane particle size is variously controlled from 70 to 230 nm, enabling to fabricate their dispersions with various transmittances. We believe that our findings not only open a meaningful path toward green elastomers with biodegradability but provides the design concept for bio-elastomers in order to develop industrial elastomers with mechanical and thermal properties.

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Flexible and densified graphene/waterborne polyurethane composite film with thermal conducting property for high performance electromagnetic interference shielding

Cited by 41 publications

References 50 publications

Bacterial-Cellulose-Reinforced Graphite Nanoplate Films for Electromagnetic Interference Shielding, Heat Conduction, and Joule Heating

Bacterial-Cellulose-Reinforced Graphite Nanoplate Films for Electromagnetic Interference Shielding, Heat Conduction, and Joule Heating

Multi-functional graphene/leather for versatile wearable electronics

In Situ Synthesis of Environmentally Friendly Waterborne Polyurethane Extended with Regenerated Cellulose Nanoparticles for Enhanced Mechanical Performances

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