Enhancing Electrical Insulation and Thermal Conductivity in Polymer Through Constructing Energy‐Dissipation Organic Electron Acceptor/Inorganic Filler

To address the issue that both electrical insulation and thermal transport performance of materials are hard to enhance synchronously, a trap-barrier synergistic strategy is proposed and utilizes the organic electronic acceptor 1,4,5,8-naphthalenetetracarboxylic anhydride (NDA) to modify the inorganic filler Al₂O₃ (AO), resulting in the formation of AO@NDA, referred to as the "energy dissipator." It restricts carrier mobility and dissipates carrier energy through the synergistic effect of trap-barrier interactions, thereby enhancing the breakdown strength of the composites. In addition, it is further enhanced the long-term effectiveness of the energy dissipator by modifying its chemical activity, based on the molecular design of NDA. The results demonstrate that the introduction of the energy dissipator significantly improves the electrical insulation properties of the composites. For example, the breakdown strength of SG filled with 15 wt.% AO@NDA reaches to 18.7 kV mm^-1, which is added up to 11.7% compared to AO/SG at the same loading. Moreover, the high-temperature electrically insulating properties of SG composites are also outstanding due to their preeminent thermal stability and transport performance. This work will present a novel, effective, and scalable approach for the field of power equipment packaging materials.