分子链的柔韧性和高频介电损耗:聚酯酰亚胺中酯键排列的影响

IF 4.1 2区 化学 Q2 POLYMER SCIENCE Chinese Journal of Polymer Science Pub Date : 2024-06-05 DOI:10.1007/s10118-024-3140-6
Ya-Dong Li, Hong Li, Lu-Kun Feng, Feng Bao, Ming-Liang Wang, Cai-Zhen Zhu, Zhao-Hui Zheng, Xiao-Bin Ding, Jian Xu
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引用次数: 0

摘要

高频通信的发展凸显了控制聚合物介质介电特性的重要性。传统理论认为,刚性分子链可降低介电损耗。然而,这一观点在高频率下的有效性仍不确定。为了仔细研究链柔性与介电特性之间的相关性,我们通过改变芳香环上的酯取代物,合成了六种分子链柔性不同的聚酯亚胺(PEIs)。酯键的引入使所有 PEI 薄膜都具有较低的介电耗散因子(Df),在干燥条件下,10 GHz 时的介电耗散因子从 0.0021 到 0.0038 不等。干 Df 显示出与体积极化率 (P/V) 一致的模式。出乎意料的是,具有最柔韧分子链的 PI-mmm-T 在干燥(0.0021 @ 10 GHz)和吸湿(0.0029 @ 10 GHz)条件下都表现出最低的介电损耗。此外,观察到的吸湿后 Df 的增加表明,PEI 在应用中的高介电损耗可能归因于其吸湿性。聚合结构的分子模拟和特性分析表明,柔性分子链中的较小空腔在紧密堆叠后会阻碍水分子的进入。尽管牺牲了耐高温性,但前驱体的溶解性能却得到了增强,并可加工成高质量的薄膜。我们的研究揭示了柔性与高频介电损耗之间关系的新见解,为合成具有优异介电特性的芳香族聚合物提供了创新视角。
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Molecular Chain Flexibility and Dielectric Loss at High-Frequency: Impact of Ester Bond Arrangement in Poly(ester imide)s

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 (Df), ranging from 0.0021 to 0.0038 at 10 GHz in dry conditions. The dry Df displayed a pattern consistent with volume polarizability (P/V). 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 Df 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.

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来源期刊
Chinese Journal of Polymer Science
Chinese Journal of Polymer Science 化学-高分子科学
CiteScore
7.10
自引率
11.60%
发文量
218
审稿时长
6.0 months
期刊介绍: Chinese Journal of Polymer Science (CJPS) is a monthly journal published in English and sponsored by the Chinese Chemical Society and the Institute of Chemistry, Chinese Academy of Sciences. CJPS is edited by a distinguished Editorial Board headed by Professor Qi-Feng Zhou and supported by an International Advisory Board in which many famous active polymer scientists all over the world are included. The journal was first published in 1983 under the title Polymer Communications and has the current name since 1985. CJPS is a peer-reviewed journal dedicated to the timely publication of original research ideas and results in the field of polymer science. The issues may carry regular papers, rapid communications and notes as well as feature articles. As a leading polymer journal in China published in English, CJPS reflects the new achievements obtained in various laboratories of China, CJPS also includes papers submitted by scientists of different countries and regions outside of China, reflecting the international nature of the journal.
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