材料科学
环氧树脂
联苯胺
电介质
复合材料
抗辐射性
戒指(化学)
化学
有机化学
光电子学
辐射
量子力学
物理
作者
Song Zhang,Weijiang Chen,Yushun Zhao,Lijian Ding,Xiaofeng Pan,Bin Du,Hao Shen,Chao Gong,Wei Yang,Kerong Yang,Xin Chen
标识
DOI:10.1016/j.compositesb.2022.110107
摘要
Multi-aromatic ring epoxy composites (MAREC) are prospective electronic packaging materials owing to their high heat resistance. However, the presence of numerous conjugated π 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 σ bond), which significantly weakens the free sharing ability of the electrons on the conjugate π 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.
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