电介质
材料科学
偶极子
介电损耗
聚合物
侧链
损耗系数
刚度(电磁)
芳香性
化学工程
高分子化学
有机化学
分子
光电子学
复合材料
化学
工程类
作者
Jiwon Lee,Sungmi Yoo,Dongkyu Kim,Yun Ho Kim,Sung Min Park,No Kyun Park,Yujin So,Jin-Soo Kim,Jong-Min Park,Min Jae Ko,Jong Chan Won
标识
DOI:10.1016/j.mtcomm.2022.104479
摘要
Low-dielectric polymer materials are becoming essential for 5 G mobile communication to achieve mass transport information without signal loss. Herein, we present an aliphatic–aromatic copolyimide using Priamine 1075 (aliphatic) and m-tolidine (aromatic) as diamines. The branched bulky aliphatic units enlarge the free volume, effectively reducing the dipole moment density, while the aromatic diamine was introduced to prevent polymer chain relaxation under the operating conditions. We observed that there is an optimal composition that regulates the chain movement and density of dipole moments through the control of the polymer chain rigidity and nanostructure. Thus, by tuning the composition, we succeeded in achieving a low-dielectric copolyimide with a dielectric constant (Dk) of 2.63 and dielectric loss (Df) of 0.0017 at 28 GHz. Combining molecular design and composition control, this study suggests a design factor for advanced copolymers for telecommunication applications with fast signal transport speed and minimum signal loss.
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