Multi-interface PA6/PS composites constructed of metal-carbon material for adjustable electromagnetic interference shielding

Wu, Bozhen; Zhu, Kaiqi; Yang, Yuhao; Wen, Xinghan; Liu, Renrong; Zhu, Honghao; Yang, Jintao

doi:10.1016/j.mtcomm.2022.104490

Cited by 4 publications

(3 citation statements)

References 51 publications

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“…The electroless nickel plating process was prepared according to the method in our previous work. 29 Detailed preparation procedures are provided in the Supporting Information.…”

Section: Methodsmentioning

confidence: 99%

Efficient Electromagnetic Interference Shielding of PPA6@NiM/PDMS Composites with Porous and Asymmetric Gradient Structures

Zhu

et al. 2023

ACS Appl. Polym. Mater.

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In this work, magnetic PA6 microspheres (PPA6@ NiM) with porous structures were prepared using the solvent coprecipitation method and electroless nickel plating technology, and the stacked magnetic microspheres were encapsulated with polydimethylsiloxane (PDMS) to obtain PPA6@NiM/PDMS composites. The existence of the porous structure increases the attenuation path of the electromagnetic wave, and the presence of the nickel layer improves the magnetic loss of the composite material to the electromagnetic wave and synergistically improves the absorption of the electromagnetic wave. Among them, the total shielding effectiveness (SET) of the PPA6@NiM4/PDMS composite is as high as 39.9 dB, and the reflection coefficient (R) is 0.83. To further increase the absorption effect of the composite material, an asymmetric gradient structure was constructed by utilizing the difference in electrical conductivity between the magnetic microspheres. The electromagnetic wave is incident from the surface with lower conductivity (impedance matching layer). It is reflected by the consistency with higher conductivity (strong reflective layer) than the bottom layer to increase the loss of electromagnetic waves inside the material. The composite SET constructed with M1 and M4 particles with the most significant difference in conductivity achieved 35.5 dB with an absorption coefficient (A) of 0.42. It shows that the porous combined asymmetric gradient structure we designed can effectively improve the shielding efficiency and absorption capacity of the composite material against electromagnetic microwaves and serve as a reference for creating high-absorbing and high-performance electromagnetic shielding materials.

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“…The electroless nickel plating process was prepared according to the method in our previous work. 29 Detailed preparation procedures are provided in the Supporting Information.…”

Section: Methodsmentioning

confidence: 99%

Efficient Electromagnetic Interference Shielding of PPA6@NiM/PDMS Composites with Porous and Asymmetric Gradient Structures

Zhu

et al. 2023

ACS Appl. Polym. Mater.

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“…As shown in Figure 12b, PA6 @NiM can optimize the conductive path of MWCNT and enhance the material conductivity, thus enhancing the EMI SE of the composite. When the contents of PA6 @NiM and MWCNT were 10 wt% and 7 wt%, respectively, the EMI SE of PA6 @NiM/MWCNT/PS reached 46.9 dB, which was 12.7 dB higher than that of pure PA6 @NiM2, as shown in Figure 12a, and was 16.64 dB higher than 7 wt% MWCNT/PS, as shown in Figure 12c [88]. The electromagnetic shielding properties of various CPC composites are listed in Table 3.…”

Section: Common Cpc Materialsmentioning

confidence: 98%

Research Progress on Intrinsically Conductive Polymers and Conductive Polymer-Based Composites for Electromagnetic Shielding

Zhao,

Li,

Lang

et al. 2023

Molecules

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Electromagnetic shielding materials are special materials that can effectively absorb and shield electromagnetic waves and protect electronic devices and electronic circuits from interference and damage by electromagnetic radiation. This paper presents the research progress of intrinsically conductive polymer materials and conductive polymer-based composites for electromagnetic shielding as well as an introduction to lightweight polymer composites with multicomponent systems. These materials have excellent electromagnetic interference shielding properties and have the advantages of electromagnetic wave absorption and higher electromagnetic shielding effectiveness compared with conventional electromagnetic shielding materials, but these materials still have their own shortcomings. Finally, the paper also discusses the future opportunities and challenges of intrinsically conductive polymers and composites containing a conductive polymer matrix for electromagnetic shielding applications.

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“…Ring-opening reactions of lactams are crucial in the preparation of polyamides and are widely used in organic synthesis (Scheme ). Nevertheless, the ring opening of stable lactams often necessitates harsh reaction conditions involving strong nucleophiles . Ring-opening reactions of lactams under Lewis acid conditions with amine nucleophiles have been reported, but they have limited applicability …”

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confidence: 99%

Ring Opening of N-Acyl Lactams Using Nickel-Catalyzed Transamidation

Rajamanickam,

Lee

2024

J. Org. Chem.

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We successfully developed a nickel-catalyzed transamidation method for the ring opening of N-acyl lactams. The method involves a reaction between N-benzoylpyrrolidin-2-one derivatives and aniline derivatives, with Ni(PPh 3 ) 2 Cl 2 serving as the catalyst, 2,2′-bipyridine as the ligand, and manganese as the reducing agent. This reaction led to the formation of ring-openingamidated products in good yields. Notably, the method exhibited excellent efficiency for producing the corresponding ring-opening transamidation products for various ring sizes, including four-, five-, six-, seven-, and eight-membered ring lactams.

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Multi-interface PA6/PS composites constructed of metal-carbon material for adjustable electromagnetic interference shielding

Cited by 4 publications

References 51 publications

Efficient Electromagnetic Interference Shielding of PPA6@NiM/PDMS Composites with Porous and Asymmetric Gradient Structures

Efficient Electromagnetic Interference Shielding of PPA6@NiM/PDMS Composites with Porous and Asymmetric Gradient Structures

Research Progress on Intrinsically Conductive Polymers and Conductive Polymer-Based Composites for Electromagnetic Shielding

Ring Opening of N-Acyl Lactams Using Nickel-Catalyzed Transamidation

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