Molecular Chain Flexibility and Dielectric Loss at High-Frequency: Impact of Ester Bond Arrangement in Poly(ester imide)s

Ya-Dong Li; Hong Li; Lu-Kun Feng; Feng Bao; Ming-Liang Wang; Cai-Zhen Zhu; Zhao-Hui Zheng; Xiao-Bin Ding; Jian Xu

doi:10.1007/s10118-024-3140-6

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Molecular Chain Flexibility and Dielectric Loss at High-Frequency: Impact of Ester Bond Arrangement in Poly(ester imide)s

RESEARCH ARTICLE | Updated：2024-08-06

- Molecular Chain Flexibility and Dielectric Loss at High-Frequency: Impact of Ester Bond Arrangement in Poly(ester imide)s
- Chinese Journal of Polymer Science Vol. 42, Issue 8, Pages: 1122-1133(2024)
- Affiliations：
  
  a.Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
  b.University of Chinese Academy of Sciences, Beijing 100081, China
  c.Institute of Low-Dimensional Materials Genome Initiative, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
- Author bio：
  
  bfisvip@163.com (F.B.)
  xbding@cioc.ac.cn (X.B.D.)
- Funds：
- DOI：10.1007/s10118-024-3140-6
  CLC：
- Published：01 August 2024，
  
  Published Online：05 June 2024，
  
  Received：28 February 2024，
  
  Revised：20 March 2024，
  
  Accepted：13 April 2024
- Accepted：
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Li, Y. D.; Li, H.; Feng, L. K.; Bao F.; Wang, M. L.; Zhu, C. Z.; Zheng, Z. H.; Ding, X. B.; Xu, J. Molecular chain flexibility and dielectric loss at high-frequency: impact of ester bond arrangement in poly(ester imide)s. Chinese J. Polym. Sci. 2024, 42, 1122–1133

Ya-Dong Li, Hong Li, Lu-Kun Feng, et al. Molecular Chain Flexibility and Dielectric Loss at High-Frequency: Impact of Ester Bond Arrangement in Poly(ester imide)s. [J]. Chinese Journal of Polymer Science 42(8):1122-1133(2024)
Li, Y. D.; Li, H.; Feng, L. K.; Bao F.; Wang, M. L.; Zhu, C. Z.; Zheng, Z. H.; Ding, X. B.; Xu, J. Molecular chain flexibility and dielectric loss at high-frequency: impact of ester bond arrangement in poly(ester imide)s. Chinese J. Polym. Sci. 2024, 42, 1122–1133 DOI： 10.1007/s10118-024-3140-6.

Ya-Dong Li, Hong Li, Lu-Kun Feng, et al. Molecular Chain Flexibility and Dielectric Loss at High-Frequency: Impact of Ester Bond Arrangement in Poly(ester imide)s. [J]. Chinese Journal of Polymer Science 42(8):1122-1133(2024) DOI： 10.1007/s10118-024-3140-6.

摘要

Six poly(ester imide)s with varying molecular chain rigidity were synthesized by altering the arrangement of the ester bond on the aromatic ring while maintaining similar polarizations

with a focus on the correlation between chain morphology and dielectric properties.

Abstract

The evolution of high-frequency communication has accentuated the significance of controlling dielectric properties in polymer media. Traditionally

it has been theorized that rigid molecular chains lead to lower dielectric loss. However

the validity of this proposition at high frequencies remains uncertain. To scrutinize the correlation between chain flexibility and dielectric properties

we synthesized six poly(ester imide)s (PEIs) with systematically varied molecular chain flexibilities by modifying the ester's substitution on the aromatic ring. The introduction of ester bonds bestowed all PEI films with a low dielectric dissipation factor (

)

ranging from 0.0021 to 0.0038 at 10 GHz in dry conditions. The dry

displayed a pattern consistent with volume polarizability (

). Unexpectedly

PI-mmm-T

featuring the most flexible molecular chain

exhibited the lowest dielectric loss under both dry (0.0021 @ 10 GHz) and hygroscopic (0.0029 @ 10 GHz) conditions. Furthermore

the observed increase in

after humidity absorption suggests that the high dielectric loss of PEI in applications may be attributed to its hygroscopic nature. Molecular simulations and characterization of the aggregation structure revealed that the smaller cavities within flexible molecular chains

after close stacking

impede the entry of water molecules. Despite sacrificing high-temperature resistance

the precursor exhibited enhanced solubility properties and could be processed into high-quality films. Our research unveils new insights into the relationship between flexibility and high-frequency dielectric loss

offering innovative perspectives on synthesizing aromatic polymers with exceptional dielectric properties.

关键词

Keywords

5G communicationsPoly(ester imide)sMolecular chain flexibilityDielectric propertiesHumidity absorption

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