Asymmetric Quinoxaline-induced Main-chain Twisting for High-frequency Low-loss Poly(aryl ether)s

Zhi-chao Yang; Li-shuai Zong; Jin-yan Wang; Xi-gao Jian

doi:10.11777/j.issn1000-3304.2026.26099

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Asymmetric Quinoxaline-induced Main-chain Twisting for High-frequency Low-loss Poly(aryl ether)s

更新时间：2026-07-10

- Asymmetric Quinoxaline-induced Main-chain Twisting for High-frequency Low-loss Poly(aryl ether)s
- Acta Polymerica Sinica Pages: 1-9(2026)
- 作者机构：
  
  1.大连理工大学，化工学院智能材料前沿科学中心精细化工国家重点实验室
  2.大连理工大学，大连理工大学高分子科学与材料系，大连 116024
  3.大连理工大学，辽宁省高性能树脂材料技术创新中心，大连 116012
- 作者简介：
  
  Li-shuai Zong, E-mail: zongls@dlut.edu.cn
  Jin-yan Wang, E-mail: wangjinyan@dlut.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2026.26099
  CLC：
- CSTR：32057.14.GFZXB.2026.7622
- Received：23 April 2026，
  
  Accepted：06 June 2026，
  
  Online First：10 July 2026，
- 稿件说明：
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杨志超, 宗立率, 王锦艳, 蹇锡高. 非对称喹噁啉诱导主链扭曲制备高频低损耗聚芳醚. 高分子学报, doi: 10.11777/j.issn1000-3304.2026.26099.

Yang, Z. C.; Zong, L. S.; Wang, J. Y.; Jian, X. G. Asymmetric quinoxaline-induced main-chain twisting for high-frequency low-loss poly(aryl ether)s. Acta Polymerica Sinica (in Chinese), doi: 10.11777/j.issn1000-3304.2026.26099.
杨志超, 宗立率, 王锦艳, 蹇锡高. 非对称喹噁啉诱导主链扭曲制备高频低损耗聚芳醚. 高分子学报, doi: 10.11777/j.issn1000-3304.2026.26099. DOI： CSTR： 32057.14.GFZXB.2026.7622.

Yang, Z. C.; Zong, L. S.; Wang, J. Y.; Jian, X. G. Asymmetric quinoxaline-induced main-chain twisting for high-frequency low-loss poly(aryl ether)s. Acta Polymerica Sinica (in Chinese), doi: 10.11777/j.issn1000-3304.2026.26099. DOI： CSTR： 32057.14.GFZXB.2026.7622.

摘要

为满足高频通信技术对低介电聚合物电介质的迫切需求，本研究提出了一种通过分子主链工程调控链构象以降低介电常数(

)与介电损耗(

)的新策略. 不同于传统的增强刚性或引入柔性基团的方法，我们致力于在保持主链刚性的前提下引入可控的分子扭曲，以同步增大自由体积和限制偶极运动. 为此，设计并合成了2种具有不同连接键角的新型非对称单喹噁啉双卤单体，并与含氟双酚6F-BPA共聚，成功制备了主链扭曲程度具有差异的聚芳醚P6FEQA与P6FEQD. 作为对照，合成了基于对称双喹噁啉单体的线性聚合物P6FEQ. 系统研究表明，主链扭曲度的增加能通过降低材料

堆积密度有效削弱宏观极化响应，并通过构象锁定有效抑制偶极弛豫. 其中，具有最大扭曲度的P6FEQD在15 GHz下展现出最优异的介电性能：介电常数低至2.385，介电损耗仅为0.00344，比商用聚醚醚酮(PEEK)在GHz频段的典型损耗值低近一个数量级，且所用单体易于合成. 本工作为通过“刚性扭曲”分子设计实现高频介电性能的优化提供了明确的范例.

Abstract

To address the urgent demand for low-dielectric-constant polymer dielectrics in high-frequency communication technologies

this study proposes a new strategy for modulating chain conformation through main-chain engineering to reduce the dielectric constant (

) and dielectric loss (

). Distinct from conventional approaches that enhance rigidity or introduce flexible segments

we aimed to introduce controlled molecular twists while maintaining main-chain rigidity

thereby simultaneously increasing free volume and restricting dipole motion. To this end

two novel asymmetric single-quinoxaline-based difluoro monomers with different bond angles were designed and synthesized

and copolymerized with the fluorinated bisphenol 6F-BPA to successfully prepare poly(aryl ether)s

namely P6FEQA and P6FEQD

with varying degrees of main-chain twisting. For comparison

a linear polymer

P6FEQ

was

synthesized using a symmetric bis-quinoxaline monomer. Systematic investigations revealed that increasing the degree of main-chain twist effectively attenuates the macroscopic polarization response by reducing packing density and strongly suppresses dipole relaxation through conformational locking. Among the obtained polymers

P6FEQD

which exhibited the highest degree of twisting

demonstrated the most outstanding dielectric performance at 15 GHz

with a

as low as 2.385 and a

of only 0.00344

which was nearly an order of magnitude lower than the typical loss values of commercial poly(ether ether ketone) (PEEK) in the GHz frequency range. Notably

the monomers employed are readily synthesizable. This work provides a clear paradigm and mechanistic elucidation for achieving high-frequency dielectric performance optimization through "rigid-twist" molecular design.

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