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

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This study developed a durable carbon nanotube/cellulose/thermoplastic polyurethane composite paper for electromagnetic interference (EMI) shielding. The material offers excellent wear resistance and maintains high shielding effectiveness after various durability tests.

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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.