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Designing multi-aromatic ring epoxy composites to integrate high insulation and high heat resistance performances by electron-induced effect

Multi-aromatic ring epoxy composites (MAREC) are prospective electronic packaging materials owing to their high heat resistance. However, the presence of numerous conjugated ? bonds lead to poor insulation performance of MAREC, limiting its further application. Here, we propose a unique strategy to design MAREC to integrate high insulation and high heat resistance performances by electron-induced effect. The results show that the substitution of H atoms of benzidine by F atoms and ?CF3 groups can lead to strong electron-induction effect. When all H atoms on the aromatic ring of benzidine are replaced by F atoms (8F), the electron-induced effect is the strongest (energy gap?=?5.56?eV). The highest occupied molecular orbital of fluorenyl biphenyl exists by head to head overlap (similar to a ? bond), which significantly weakens the free sharing ability of the electrons on the conjugate ? bonds of the aromatic ring. Although the reaction activity of ?NH2 groups of 8F is low, the strong electron-induction effect of 8F can be fully harnessed by combining CF (two ?CF3 groups replacing the H atoms of benzidine). The designed MAREC shows excellent insulation performance (AC breakdown strength?=?39.18?kV/mm) and heat resistance performance (Tg?=?234.5??C, Td?=?396.6??C). Furthermore, the dielectric constant and dielectric loss are low ([email protected] and [email protected], respectively). We successfully fabricated materials with enhanced insulation and heat resistance performances, which can be used as packaging materials for large-scale integrated circuits, new energy power equipment, and energy storage devices.

» Author: Song Zhang, Weijiang Chen, Yushun Zhao, Lijian Ding, Xiaofeng Pan, Bin Du, Hao Shen, Chao Gong, Wei Yang, Kerong Yang, Xin Chen

» Publication Date: 15/08/2022

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