聚酰亚胺
电介质
材料科学
冠醚
牙冠(牙科)
低频
复合材料
乙醚
热的
高分子化学
光电子学
有机化学
化学
热力学
离子
物理
图层(电子)
天文
作者
Heming Li,Xinming Wang,Ziyang Ding,Weiguo Gao,Yan Liu,Ke Ma,Zhizhi Hu,Yongqi Wang
出处
期刊:Polymers
[Multidisciplinary Digital Publishing Institute]
日期:2024-04-24
卷期号:16 (9): 1188-1188
被引量:3
标识
DOI:10.3390/polym16091188
摘要
Polymer materials with a low dielectric constant and low dielectric loss have the potential to be applied to high-frequency signal transmissions, such as mobile phone antennas and millimeter wave radars. Two types of diamines, 4,4′-diamino-p-tetraphenyl (DPT) and crown ether diamine (CED), were prepared for ternary copolymerization with BPDA in this study. Cross-links with molecular chains were formed, increasing molecular chain distance by utilizing rings of CED. The MPI films exhibit a good thermal performance with the increase in CED addition, with Tg > 380 °C and CTE from −4 × 10−6 K−1 to 5 × 10−6 K−1. The Young’s modulus can reach 8.6 GPa, and the tensile strength is above 200 MPa when 5% and 7% CED are introduced. These MPI films exhibit good mechanical performances. The dielectric constant of PI−10% film can go as low as 3.17. Meanwhile, the relationship between dielectric properties and molecular structure has been demonstrated by Molecular Simulation (MS). PI molecules are separated by low dielectric groups, resulting in a decrease in the dielectric constant.
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