Multifunctional Shape‐Stabilized Phase Change Materials with Enhanced Thermal Conductivity and Electromagnetic Interference Shielding Effectiveness for Electronic Devices

Abstract

AbstractA paraffin‐based shape‐stabilized composite phase change material (CPCM) is fabricated with dramatically enhanced thermal conductivity and excellent electromagnetic interference (EMI) shielding capacity. The as‐prepared CPCMs are supported by graphene‐based frameworks with many bubble‐like micropores that are prepared by the addition of polystyrene microspheres into graphene oxide hydrogel as hard templates. These bubble‐like micropores can encapsulate paraffin wax (PW) due to the strong capillary force between the graphene‐based framework and PW and leading to enhanced shape stability of the as‐prepared CPCMs. Moreover, the continuous thermally and electrically conductive network formed by graphene nanoplatelets endows the as‐prepared CPCMs with a high thermal conductivity and an excellent EMI shielding effectiveness. When the ratio of graphene‐based framework is 23.0 wt%, the thermal conductivity and latent heat of CPCM reaches 28.7 W m−1 k−1 and 175.8 J g−1, respectively, and the EMI shielding effectiveness is higher than 45 dB in the frequency of 8.2–12.4 GHz. Their outstanding thermal and EMI shielding performance makes the as‐prepared CPCMs promising candidates for use in thermal management and EMI shielding of electronic devices.