Vitrimer chemistry enables epoxy nanocomposites with mechanical robustness and integrated conductive segregated structure for high performance electromagnetic interference shielding

Fang, Huagao; Ye, Wujin; Yang, Kangjie; Song, Kai; Wei, Haibing; Ding, Yunsheng

doi:10.1016/j.compositesb.2021.108782

Cited by 60 publications

(49 citation statements)

References 53 publications

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“…The s-EV/h-BN samples show reduced T g values as compared with pristine EV, and their value decreases as the h-BN content increases (Figure ). This phenomenon is consistent with our previous results obtained from segregated MWCNTs in the EV matrix . More EG molecules can be trapped when more h-BN nanosheets are located among EV particles during compression molding and participate in alcoholysis reaction to reduce the crosslinking density of the vitrimer matrix.…”

Section: Resultssupporting

confidence: 93%

“…The preparation process of well-structured EV/MWCNTs/h-BN composites is schematically illustrated in Figure . The EV matrix was prepared following the same recipe and method reported in our previous work, in which the reaction of epoxy groups on DGEBA with the carboxylic acid on the multifunctional polymerized fatty acid derivatives occurs with the aid of sufficient content of the catalyst. With the incorporation of 1 wt % of MWCNTs, the composite of uni-EV/MWCNTs was obtained and then pulverized into small particles.…”

Section: Resultsmentioning

confidence: 99%

“…The construction of a segregated filler network in the polymer matrix is difficult, which requires exquisite preparing strategy and well-controlled processing parameters. Our previous work on epoxy vitrimer provided an alternative to prepare a segregated filler network under facile and loose thermal molding conditions . Vitrimer is a novel covalently crosslinked polymer that alters and rearranges the topology networks through rapid exchange reactions at high temperature.…”

Section: Introductionmentioning

confidence: 99%

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Endowing Thermally Conductive and Electrically Insulating Epoxy Composites with a Well-Structured Nanofiller Network via Dynamic Transesterification-Participated Interfacial Welding

Zhang

Zhou

et al. 2022

Ind. Eng. Chem. Res.

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It is urgently required to achieve good thermal conductivity and electrical insulation performance in polymerbased composites with the minimum incorporation of functional fillers. In this work, the selective distribution of multiwalled carbon nanotubes (MWCNTs) in the segregated network of hexagonal boron nitride (h-BN) in the epoxy vitrimer matrix was achieved by compression molding, in which interfacial welding was enabled by small-molecule-participated dynamic transesterification at elevated temperatures. Due to the synergistic contribution of the wellstructured nanofiller network, the epoxy vitrimer composites demonstrate enhanced thermal conductivity and electrical insulation at low filler content. The composite containing 1 wt % of MWCNTs and 8 wt % of h-BN shows thermal conductivity and electrical resistivity of 0.83 W/(m•K) and 1.92 × 10 11 Ω•cm, respectively. The electrical resistivity can be further improved by increasing the segregated h-BN content. This method provides a novel way to prepare cost-effective polymer composites with excellent thermal conductivity and electrical insulation.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Endowing Thermally Conductive and Electrically Insulating Epoxy Composites with a Well-Structured Nanofiller Network via Dynamic Transesterification-Participated Interfacial Welding

Zhang

Zhou

et al. 2022

Ind. Eng. Chem. Res.

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“…Generally, the high electrical conductivity of the EMI shielding material means excellent EMI shielding performance. ,− , Figure b shows the EMI SE of CNTs/Al 2 O 3 composites with 2.0 mm thickness in the X-band. As expected, Al 2 O 3 shows extremely low EMI SE, and the increase in the CNT content is accompanied by a rapid increase in the EMI SE, which shows the same trend as its conductivity.…”

Section: Resultsmentioning

confidence: 99%

“…To uniformly disperse the fillers, constructing a segregated structure is an efficient method to further reduce the percolation threshold of the conductive network in EMI shielding composites. , The EMI shielding material with a segregated structure is prepared by wrapping conductive fillers on the surface of matrix particles and hot-pressing at appropriate temperatures. − During the hot-pressing process, the conductive fillers are squeezed at the interface of matrix particles and selectively distributed between the microdomain interfaces to form a segregated structure. , The probability of overlap between conductive fillers is significantly increased, which is beneficial to realize the formation of a more complete conductive network with lower content of conductive fillers. , There are a number of studies on polymer-based EMI shielding materials with segregated structures. Fang et al built a segregated structure in CPCs to effectively reduce the penetration threshold. A satisfactory conductivity of 6.8 S/m and EMI SE of 31.5 dB are achieved with only 4 wt % MWCNT.…”

Section: Introductionmentioning

confidence: 99%

Ni@CNTs/Al₂O₃ Ceramic Composites with Interfacial Solder Strengthen the Segregated Network for High Toughness and Excellent Electromagnetic Interference Shielding

Sang

Wang

Zhao

et al. 2022

ACS Appl. Mater. Interfaces

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Ingenious microstructure design and appropriate multicomponent strategies are still challenging for advanced electromagnetic interference (EMI) shielding materials with excellent shielding effectiveness (SE) and reliable mechanical properties in harsh environments and low filling levels. In this study, nickel@multiwalled carbon nanotubes/alumina (Ni@ CNTs/Al 2 O 3 ) ceramic composites with segregated structures and electric/magnetic-coupling networks anchored by CNTs and magnetic Ni nanofillers were prepared by hot-press sintering. CNTs/Al 2 O 3 ceramic composites exhibit a percolation threshold of only about 0.32013 vol %, which is lower than those of other reported CNTs/Al 2 O 3 composites with segregated or uniformly dispersed structures. The electrical conductivity and EMI SE of 9CNTs/Al 2 O 3 ceramic composites with 9 vol % (4.76 wt %) CNT content were 103.1 S/m and 33.6 dB, respectively. In addition, EMI SE and toughness were both enhanced by the synergistic effect of Ni nanoparticles and CNTs. In the unit of a segregated structure, a three-dimensional (3D) electric/magnetic-coupling network effectively captures and attenuates electromagnetic wave energy by electrical conduction, dielectric loss, and magnetic loss. On the other hand, the pull-out of CNTs and deflection of cracks distributed along the segregated structures synergistically enhance the fracture toughness of Ni@CNTs/Al 2 O 3 ceramic composites. High-performance 3Ni@5CNTs/Al 2 O 3 ceramic composites with 5 vol % (2.64 wt %) and 3 vol % (0.76 wt %) CNT contents have been achieved, whose EMI SE is 41.8 dB, density is 90.99%, flexural strength is 197.83 ± 18.62 MPa, and fracture toughness is 6.03 ± 0.23 MPa•m 1/2 . This efficient method provides a promising way to fabricate EMI shielding ceramic composites with high mechanical properties.

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Flexible Polyurethane@Ti₃C₂T_x/Silver Nanowires Composite Films with Cocontinuous Segregated Structures for Superior Electromagnetic Interference Shielding and Joule Heating

Jing

Jiang

et al. 2023

Adv Eng Mater

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With the booming development of communication technology and electronic equipment, the leakage of electromagnetic waves causes serious damages to the sensitive electronic equipment and electronic components, resulting in the instability or loss of control of electronic devices in aerospace, weapon equipment, and wearable devices. [1][2][3][4] Moreover, it brings great harm to human blood, immune system, reproductive system, and embryo development. [5][6][7] To ensure the normal operation of electronic equipment and protect human health, it is necessary to use electromagnetic interference (EMI) shielding materials to block electromagnetic waves. To date, metals are the most widely used modern industrial EMI shielding materials because of their high electrical conductivity and outstanding EMI shielding effectiveness (SE). [8,9] However, owing to their high mass density, poor flexibility, inferior corrosion resistance, and difficult processibility, the metal materials cannot meet the miniaturization, lightweight, and integration requirements for electronic and communication equipment. Moreover, the reflected electromagnetic waves on the surface of metals due to poor impedance mismatching cause the secondary pollution problems. [10,11] Recently, the conductive polymer composites (CPCs) with one single or hybrid conductive fillers dispersed in the single-phase or multiphase polymer matrix have taken great attention. [12][13][14] Compared with the traditional metal materials, CPCs show a wide application prospect due to their advantages of low density, [15] excellent corrosion resistance, [16] good chemical stability, [17] easy processing, [18] and low cost. [19] Nevertheless, to obtain the desirable EMI shielding performances, high filling amounts of conductive fillers are usually needed, which is disadvantageous to the mechanical properties and processibility of CPCs due to the agglomeration of conductive fillers. [20,21] Constructing conductive segregated structures is an effective strategy to decrease the conductive percolation threshold and enhances the EMI SE of CPCs. In comparison with the homogeneous structures, the unique segregated structures with conductive fillers selectively distributed at the interfaces between adjacent polymer microregions show high-efficiency continuous 3D conductive networks. This leads to the decreased percolation threshold, significantly improved electrical conductivities and EMI shielding performances. [22][23][24] Yan et al. [25] assembled the reduced graphene oxide (rGO) on polystyrene (PS) particles, and prepared the segregated PS@rGO composites via

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Vitrimer chemistry enables epoxy nanocomposites with mechanical robustness and integrated conductive segregated structure for high performance electromagnetic interference shielding

Cited by 60 publications

References 53 publications

Endowing Thermally Conductive and Electrically Insulating Epoxy Composites with a Well-Structured Nanofiller Network via Dynamic Transesterification-Participated Interfacial Welding

Endowing Thermally Conductive and Electrically Insulating Epoxy Composites with a Well-Structured Nanofiller Network via Dynamic Transesterification-Participated Interfacial Welding

Ni@CNTs/Al₂O₃ Ceramic Composites with Interfacial Solder Strengthen the Segregated Network for High Toughness and Excellent Electromagnetic Interference Shielding

Flexible Polyurethane@Ti₃C₂T_x/Silver Nanowires Composite Films with Cocontinuous Segregated Structures for Superior Electromagnetic Interference Shielding and Joule Heating

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Vitrimer chemistry enables epoxy nanocomposites with mechanical robustness and integrated conductive segregated structure for high performance electromagnetic interference shielding

Cited by 60 publications

References 53 publications

Endowing Thermally Conductive and Electrically Insulating Epoxy Composites with a Well-Structured Nanofiller Network via Dynamic Transesterification-Participated Interfacial Welding

Endowing Thermally Conductive and Electrically Insulating Epoxy Composites with a Well-Structured Nanofiller Network via Dynamic Transesterification-Participated Interfacial Welding

Ni@CNTs/Al2O3 Ceramic Composites with Interfacial Solder Strengthen the Segregated Network for High Toughness and Excellent Electromagnetic Interference Shielding

Flexible Polyurethane@Ti3C2Tx/Silver Nanowires Composite Films with Cocontinuous Segregated Structures for Superior Electromagnetic Interference Shielding and Joule Heating

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Product

Resources

About

Ni@CNTs/Al₂O₃ Ceramic Composites with Interfacial Solder Strengthen the Segregated Network for High Toughness and Excellent Electromagnetic Interference Shielding

Flexible Polyurethane@Ti₃C₂T_x/Silver Nanowires Composite Films with Cocontinuous Segregated Structures for Superior Electromagnetic Interference Shielding and Joule Heating