Preparation of Self-Healing Thermoplastic Polyurethane/Carbon Nanotube Nanocomposites for Electromagnetic Shielding

초록

Electromagnetic interference (EMI)-shielding nanocomposites are prone to damage during long-term use, compromising device performance. Consequently, extensive attention has been paid to materials that combine reliable EMI shielding with self-healing capabilities. In this study, a flexible conductive thermoplastic polyurethane (TPU) nanocomposite integrating EMI shielding and self-healing functionalities was facilely developed through a solution blending process followed by simple casting. In the X-band frequency range, the nanocomposite containing 15.0 wt% Fe3O4@multiwalled carbon nanotubes (Fe@CNT) exhibits an outstanding EMI shielding effectiveness of 37.6 dB. After three cut-repair cycles, the EMI shielding effectiveness recovers to 34.6 dB, retaining 92.3% of its initial performance. The TPU-Fe@CNT (TPUF) nanocomposite exhibits reproducible tensile properties, demonstrating excellent healing repeatability (healing efficiency: 96%) in elongation at break. Thus, this work presents a self-healable EMI shielding nanocomposite, showcasing its potential for applications in wearable electronics where durability and long-term reliability are paramount.

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