Unraveling molecular loss processes for dielectric polymers in the Terahertz frequency range: Impact of polarity and chain rigidity

Dielectric polymers serve as integral materials in both 5G (up to GHz, 109 Hz) and 6G (up to THz, 1012 Hz) technologies. Despite their significance, the mechanisms governing the loss properties and dielectric responses at high frequencies are not fully understood, posing challenges in the rational d...

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Veröffentlicht in:Polymer (Guilford) 2024-03, Vol.297, p.126855, Article 126855
Hauptverfasser: Xiao, Haokun, Huang, Jianjian, Wang, Mengmeng, Huang, Weixi, Li, Maoyuan, Jin, Gang
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Sprache:eng
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Zusammenfassung:Dielectric polymers serve as integral materials in both 5G (up to GHz, 109 Hz) and 6G (up to THz, 1012 Hz) technologies. Despite their significance, the mechanisms governing the loss properties and dielectric responses at high frequencies are not fully understood, posing challenges in the rational design of polymers with targeted loss properties. The loss properties and dielectric responses are influenced by the multilevel structure of polymers, including functional groups and chain rigidity, while the dominant factor in determining the loss properties is still unclear. The loss processes for dielectric polymers in THz frequency range have been investigated using THz-time domain spectroscopy and quantum chemistry/molecular dynamic simulations. High-frequency polymer loss properties may be attributed to the relaxation of internal dipoles, influenced collectively by both polarity and molecular rigidity, with polarity exerting a more pronounced effect. Additionally, the effect of molecule polarity and rigidity on loss properties was investigated. These insights permit deeper understanding of loss in the THz frequency range. [Display omitted] •The loss processes of dielectric polymers in THz frequency range were investigated.•Molecular polarity plays a more dominant role in loss properties than chain rigidity.•Low polarity and strong rigidity are key factors for low loss properties in THz band.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2024.126855