High-Durability Cellulose-Based Composite Paper with Superior Electromagnetic Interference Shielding

Area of Science:

• Materials Science
• Nanotechnology
• Polymer Science

Background:

• Efficient electromagnetic interference (EMI) shielding is crucial for modern electronics, but mechanical durability remains a significant challenge for flexible and portable devices.
• Thermoplastic polyurethane (TPU) offers excellent wear resistance and flexibility, making it a promising base for durable shielding materials.

Purpose of the Study:

• To develop a mechanically robust and highly effective EMI shielding material using a composite of carbon nanotubes (CNTs), cellulose, and TPU.
• To investigate the structural integrity, conductivity, and shielding performance of the developed composite under various stress conditions.

Main Methods:

• A three-layer composite paper of carbon nanotube/cellulose/thermoplastic polyurethane (CNT/paper/TPU) was fabricated using a coating method.
• The integration of components was achieved through strong hydrogen bonding between CNTs, cellulose, and TPU.
• Material properties including thickness, conductivity, EMI shielding effectiveness, and durability (water, solvent, bending, friction) were evaluated.

Main Results:

• The CNT/paper/TPU composite exhibited a thickness of 0.54 mm and a conductivity of 1040 S/m.
• Exceptional EMI shielding effectiveness of 69.0 dB was achieved.
• The composite demonstrated excellent durability against water, solvents, bending, and friction, maintaining its shielding performance and mechanical integrity.

Conclusions:

• The developed CNT/paper/TPU composite offers a simple strategy for creating durable EMI shielding materials.
• Its robust mechanical properties, fatigue resistance, and sustained shielding performance enhance the lifespan and reliability of electronic equipment.
• This material presents a viable solution for EMI shielding in demanding applications like portable hardware and flexible electronics.