Shape Memory-Driven Intelligent Composite Film for Infrared Stealth and Adjustable EMI Shielding

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• The growing complexity of the electromagnetic environment necessitates advanced electromagnetic interference (EMI) shielding materials.
• Developing polymer-based EMI shielding with tunable performance and recyclability presents significant challenges in structural control and functionality.
• Intelligent electronic materials require integrated functionalities like EMI shielding, infrared stealth, and responsiveness.

Purpose of the Study:

• To develop a multifunctional shape memory polyurethane (SMPU)-based composite system.
• To integrate electromagnetic shielding and infrared stealth capabilities with intelligent responsiveness.
• To achieve precise structural control and tunable functionality in advanced polymer composites.

Main Methods:

• Synthesized SMPU using polytetramethylene ether glycol, 4,4'-dicarboxydiphenyl disulfide, isophorone diisocyanate, and tannic acid.
• Incorporated dynamic disulfide bonds and hydrogen bonding for self-healing and shape memory properties.
• Introduced silver nanowires (AgNWs) and layered MXene, forming a 1D/2D hybrid conductive pathway via Ag-S covalent bonding and interfacile interactions.

Main Results:

• Achieved tunable electromagnetic interference shielding effectiveness (EMI SE) from 60.0 to 11.0 dB under 0-30% tensile strain in the X-band (8-12 GHz).
• Demonstrated excellent infrared stealth performance with stable surface temperature (≈20 °C) during shape memory recovery at 50 °C.
• Enhanced electrical conductivity stability and interfacial stability through the formation of a stable hybrid conductive pathway.

Conclusions:

• The developed SMPU-based composite system offers a practical approach for creating intelligent electronic materials with tunable functionality.
• The integration of dynamic bonds and hybrid conductive fillers provides long-term stability and self-healing properties.
• This work advances the design of advanced materials for electromagnetic shielding and thermal management in complex environments.