�Donor-acceptor�, �interpenetrating polymer network� and �electrostatic self-assembly� work in tandem to achieve extraordinary specific shielding effectiveness

Malakar, A and Mandal, S and Sen Gupta, R and Kashyap, V and Raj, R and Manna, K and Bose, S (2024) �Donor-acceptor�, �interpenetrating polymer network� and �electrostatic self-assembly� work in tandem to achieve extraordinary specific shielding effectiveness. In: Nanoscale, 16 (32). pp. 15343-15357.

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Abstract

The exploration of �electrostatic self-assembly� on solid surfaces has garnered significant interest across various fields. With the sophistication of gadgets, managing electromagnetic interference (EMI) from stray signals, especially in stealth applications, necessitates materials that can absorb microwaves. A promising approach involves integrating lightweight self-healing polymeric materials. This study employs electrostatic self-assembly to design a carbon nanotube structure on an interpenetrating polymer network (IPN) made of PVDF and bismaleimide (BMI)-grafted dopamine hydrochloride, enhancing mechanical integrity through well-formed IPNs. Graphene oxide (GO) is introduced before IPN formation to facilitate an �acceptor-donor� interaction via the Diels-Alder adduct between BMI and GO, which binds with multi-walled carbon nanotubes (MWCNTs). MWCNTs, modified with PQ7 or PDDA for a positive charge, self-assemble onto the IPN-GO construct, creating a lightweight and chemically stable structure capable of absorbing electromagnetic radiation. The 21 μm thick construct exhibits enhanced microwave absorption within the X-band (8.2-12.4 GHz), with a specific shielding effectiveness of 8637 dB cm2 g�1 and a green index (gs � 1.41). The construct is coated with self-healable polyetherimide (PEI) containing exchangeable disulfide bonds to address maintenance challenges, providing heat-triggered self-healing properties. These innovative structures offer solutions for 5G and IoT applications where lightweight, durable, and multifunctional properties are essential for effectively shielding electronic devices from stray signals. © 2024 The Royal Society of Chemistry.

Item Type:	Journal Article
Publication:	Nanoscale
Publisher:	Royal Society of Chemistry
Additional Information:	The copyright for this article belongs to Publishers.
Keywords:	5G mobile communication systems; Amines; Covalent bonds; Electromagnetic pulse; Electromagnetic shielding; Graphene; Hydrogen bonds; Self assembly; Self-healing materials; Sulfur compounds, A-carbon; Assembly works; Bismaleimides; Donor/acceptor; Electrostatic self-assembly; Graphene oxides; Multi-walled-carbon-nanotubes; Self-healing; Shielding effectiveness; Solid surface, Multiwalled carbon nanotubes (MWCN)
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	03 Sep 2024 05:57
Last Modified:	03 Sep 2024 05:57
URI:	http://eprints.iisc.ac.in/id/eprint/86024

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