π-π stacking interface design for improving the strength and electromagnetic interference shielding of ultrathin and flexible water-borne polymer/sulfonated graphene composites

Wei, Linfeng; Zhang, Wenbo; Ma, Jianzhong; Bai, Shu‐Lin; Ren, Yanjuan; Liu, Chao; Simion, Demetra; Qin, Jianbin

doi:10.1016/j.carbon.2019.04.058

Cited by 99 publications

(51 citation statements)

References 66 publications

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“…The simulation results shown that nanocomposites have the higher mechanical properties in comparison with those in pure PET system, ascribing a stronger interaction between the modified silica and polymer chains. We have successfully employed MD simulation to check on the presence of p-p stacking interaction between poly (styrene-butyl acrylate) latex (P(St-BA)) and sulfonated graphene nanosheet (S-GNS) [40].…”

Section: Introductionmentioning

confidence: 99%

Surface Modification Design for Improving the Strength and Water Vapor Permeability of Waterborne Polymer/SiO2 Composites: Molecular Simulation and Experimental Analyses

Liu³

et al. 2020

Polymers

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Polymer-based nanocomposites properties are greatly affected by interfacial interaction. Polyacrylate nanocomposites have been widely studied, but few studies have been conducted on their interface mechanism. Therefore, there was an urgent demand for providing a thorough understanding of the polymethyl acrylate/SiO2 (PMA/SiO2) nanocomposites to obtain the desired macro-performance. In this paper, a methodology, which combined molecular dynamics simulation with experimental researches, was established to expound the effect of the surface structure of SiO2 particles which were treated with KH550, KH560 or KH570 (KH550-SiO2, KH560-SiO2 and KH570-SiO2) on the mechanical characteristic and water vapor permeability of polymethyl acrylate/SiO2 nanocomposites. The polymethyl acrylate/SiO2 nanocomposites were analyzed in binding energy and mean square displacement. The results indicate that PMA/KH570-SiO2 had the highest tensile strength, while PMA/KH550-SiO2 had the highest elongation at break at the same filler content; KH550-SiO2 spheres can significantly improve water vapor permeability of polyacrylate film.

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Section: Introductionmentioning

confidence: 99%

Surface Modification Design for Improving the Strength and Water Vapor Permeability of Waterborne Polymer/SiO2 Composites: Molecular Simulation and Experimental Analyses

Liu³

et al. 2020

Polymers

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“…These normalized results are comparable with state-ofthe-art attenuation levels (in the order of ≈1 dB µm −1 ) of other carbon-based nanocomposites. [68,[72][73][74][75]…”

Section: Emi Shielding Of the Deformable Conductorsmentioning

confidence: 99%

Graphene–Polyurethane Coatings for Deformable Conductors and Electromagnetic Interference Shielding

Cataldi

Papageorgiou

Pinter

et al. 2020

Adv Elect Materials

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Electrically conductive, polymeric materials that maintain their conductivity even when under significant mechanical deformation are needed for actuator electrodes, conformable electromagnetic shielding, stretchable tactile sensors, and flexible energy storage. The challenge for these materials is that the percolated, electrically conductive networks tend to separate even at low strains, leading to significant piezoresistance. Herein, deformable conductors are fabricated by spray‐coating a nitrile substrate with a graphene–elastomer solution. The electrical resistance of the coatings shows a decrease after thousands of bending cycles and a slight increase after repeated folding‐unfolding events. The deformable conductors double their electrical resistance at 12% strain and are washable without changing their electrical properties. The conductivity–strain behavior is modeled by considering the nanofiller separation upon deformation. To boost the conductivity at higher strains, the production process is adapted by stretching the nitrile substrate before spraying, after which it is released. This adaption meant that the electrical resistance doubles at 25% strain. The electrical resistance is found sufficiently low to give a 1.9 dB µm−1 shielding in the 8–12 GHz electromagnetic band. The physical and electrical properties, including the electro magnetic screening, of the flexible conductors, are found to deteriorate upon cycling but can be recovered through reheating the coating.

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“…The proposed shielding mechanism between electromagnetic waves and dense thin film shield (such as PAN film) and the Cu x S/PAN nanofiber mats is displayed in Figure . For membrane shielding materials, the shielding mechanism is entirely attributable to the reflection of electromagnetic waves on the surface of the material and the absorption inside the membrane, especially the latter. Figure a shows that electromagnetic waves pass directly through the interior of the thin film due to the dense structure, which is a disadvantage as an electromagnetic shielding material.…”

Section: Resultsmentioning

confidence: 99%

Cu_xS/PAN 3D Nanofiber Mats as Ultra‐Lightweight and Flexible Electromagnetic Interference Shielding Materials

Jensen

Wang

et al. 2019

Macro Materials & Eng

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Shielding materials are becoming increasingly important, but present materials suffer from either insufficient mechanical stability or limited shielding properties. In this study, 3D flexible copper sulfide (CuxS)/polyacrylonitrile (PAN) nanofiber mats are developed via air spinning followed by chemical reaction with copper salt. The CuxS/PAN nanofiber mats exhibit an ultra‐lightweight density of 0.044 g cm−3 and a thickness of 0.423 mm. Stable electromagnetic interference (EMI) shielding effectiveness (SE) (29–31 dB) of the CuxS/PAN composite is achieved in the frequency range of 500–3000 MHz. EMI SE per unit surface density of 16 655.92 dB cm2 g−1 is several orders of magnitude higher than most copper sulfide containing EMI shielding materials reported in literature. In addition, the introduction of the CuxS improves the thermal stability and launderability of the PAN mats giving the mats thermal, mechanical, and aqueous stability. Finally, the shielding mechanism of the CuxS/PAN nanofiber mats for electromagnetic waves is proposed

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π-π stacking interface design for improving the strength and electromagnetic interference shielding of ultrathin and flexible water-borne polymer/sulfonated graphene composites

Cited by 99 publications

References 66 publications

Surface Modification Design for Improving the Strength and Water Vapor Permeability of Waterborne Polymer/SiO2 Composites: Molecular Simulation and Experimental Analyses

Surface Modification Design for Improving the Strength and Water Vapor Permeability of Waterborne Polymer/SiO2 Composites: Molecular Simulation and Experimental Analyses

Graphene–Polyurethane Coatings for Deformable Conductors and Electromagnetic Interference Shielding

Cu_xS/PAN 3D Nanofiber Mats as Ultra‐Lightweight and Flexible Electromagnetic Interference Shielding Materials

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π-π stacking interface design for improving the strength and electromagnetic interference shielding of ultrathin and flexible water-borne polymer/sulfonated graphene composites

Cited by 99 publications

References 66 publications

Surface Modification Design for Improving the Strength and Water Vapor Permeability of Waterborne Polymer/SiO2 Composites: Molecular Simulation and Experimental Analyses

Surface Modification Design for Improving the Strength and Water Vapor Permeability of Waterborne Polymer/SiO2 Composites: Molecular Simulation and Experimental Analyses

Graphene–Polyurethane Coatings for Deformable Conductors and Electromagnetic Interference Shielding

CuxS/PAN 3D Nanofiber Mats as Ultra‐Lightweight and Flexible Electromagnetic Interference Shielding Materials

Contact Info

Product

Resources

About

Cu_xS/PAN 3D Nanofiber Mats as Ultra‐Lightweight and Flexible Electromagnetic Interference Shielding Materials