Anisotropically Aligned Graphene Nanoplatelets in Polyurethane Films for Excellent In-plane Thermal Conductivity and Electromagnetic Interference Shielding
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Thermally conductive materials with excellent flexibility and electromagnetic interference (EMI) shielding have become the main subject of research in modern electronic industries. Here, we present the stretching-induced filler alignment method for aligning graphene nanoplatelets (GnP) in polyurethane (PU) films via uniaxial stretching of GnP/PU films to a specific degree. The resulting stretched GnP/PU films with only 10 wt% of GnP exhibit outstanding in-plane thermal conductivity (λ∥) and EMI shielding effectiveness (SE) values of 10.68 W/mK and 41 dB respectively. As a result of stretching, the interfacial thermal resistance is reduced, allowing for effective phonon and electron transmission, which enhances the λ∥ and EMI SE in the stretched film. This research was supported by a grant from the Academic Research Program of Korea National University of Transportation in 2023. Carbon 201 (2023) 568–576.