https://scholars.lib.ntu.edu.tw/handle/123456789/636508
標題: | Exploring the Cross-Linking Effect on Decreasing the Dielectric Constant and Dissipation Factor of Poly(ester imide)s at a High Frequency of 10-40 GHz | 作者: | Cheng, Ying Chi Chen, Yu Che Lin, Yan Cheng Kuo, Chi Ching WEN-CHANG CHEN |
關鍵字: | coefficient of thermal expansion (CTE) | cross-linking | dielectric constant | dissipation factor | polyimides | 公開日期: | 1-一月-2023 | 卷: | 5 | 期: | 10 | 來源出版物: | ACS Applied Polymer Materials | 摘要: | Polyimides possess excellent thermal-mechanical stability and solution processability and can be widely used in the electronic industry. In particular, they can achieve a decent insulating property at a high frequency spanning the range 10-40 GHz via chemical structural design, so it is important to investigate the structure-dielectric relationship of polyimides. However, it is challenging to reach a low dielectric constant (Dk) as well as a low dissipation factor (Df), simultaneously, owing to the trade-off between the free volume and rigidity of polyimides. Among them, poly(ester imide)s (PEIs) are well-known for their ultralow Df of 0.003 at 10 GHz; however, their high Dk of 3.2 confines the insulating capability of PEIs. To overcome this difficulty, a cross-linking strategy is applied to PEIs to decrease their Dk. In this research, the linear PEI is copolymerized with a series of aromatic cross-linkers comprising melamine, tris(4-aminophenyl)amine, 1,3,5-tris(4-aminophenyl)benzene, 1,3,5-tris(4-aminophenoxy)benzene, benzene-1,3,5-triyl tris(4-aminobenzoate), and tris(4-aminophenyl)benzene-1,3,5-tricarboxylate. The functional groups of aromatic triamine cross-linkers including ether and ester groups strike the best balance between the polymer’s free volume and rigidity. The experimental results revealed that they maintain decent thermal stability with a glass transition point over 350 °C and enhance mechanical durability with strength/elongation at a break of 164 MPa and 22%. Notably, the cross-linked PEIs can reduce the Dk to below 3.0 and maintain the Df at approximately 0.003 at a high frequency spanning the range of 10-40 GHz. This study provides an effective approach to control the dielectric properties of polyimides through manipulating the structure rigidity and free volume by using cross-linking. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/636508 | ISSN: | 2637-6105 | DOI: | 10.1021/acsapm.3c01144 |
顯示於: | 化學工程學系 |
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