Alkyl Side-Chain-Induced Improvement of Dielectric Properties of Polymers. 1. Fluorene–Benzocyclobutene-Based Polymers

IF 5.1 1区化学 Q1 POLYMER SCIENCE Macromolecules Pub Date : 2024-06-27 DOI:10.1021/acs.macromol.4c01056

Manling Shi, Jing Sun, Qiang Fang

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Abstract

Alkyl side chains have been demonstrated to significantly affect the interchain packing of π-conjugated polymers, while their potential for modifying low-k materials remains unexplored. Herein, four low-k nonconjugated polymers based on the fluorenyl group with linear alkyl side chains of different lengths have been prepared. With the increase of the side chain length, their dielectric constants (D_k) gradually decrease. For example, when the side chains are butyl, hexyl, dodecyl, and octadecyl, the D_k values of the polymers are 2.62, 2.59, 2.50, and 2.45, respectively. Moreover, the polymers also display dielectric loss (D_f) values of below 5.0 × 10^–4 at 10 GHz. This discovery indicates that the alkyl side chains also have a big effect on the dielectric properties of the nonconjugated polymers via disrupting the close packing of the polymer chains, inducing the improvement of the dielectric properties of the polymers. This contribution provides a new strategy for the design of low-k materials used in the microelectronic industry.

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烷基侧链改善聚合物的介电性能。1.芴-苯并环丁烯基聚合物

烷基侧链已被证明会显著影响π-共轭聚合物的链间堆积，但它们在改性低k值材料方面的潜力仍有待开发。本文制备了四种基于芴基的低 k 非共轭聚合物，它们具有不同长度的线性烷基侧链。随着侧链长度的增加，它们的介电常数（Dk）逐渐降低。例如，当侧链为丁基、己基、十二烷基和十八烷基时，聚合物的 Dk 值分别为 2.62、2.59、2.50 和 2.45。此外，这些聚合物在 10 千兆赫时的介电损耗（Df）值也低于 5.0 × 10-4。这一发现表明，烷基侧链通过破坏聚合物链的紧密堆积，对非共轭聚合物的介电性能也有很大影响，从而改善了聚合物的介电性能。这一贡献为微电子工业中使用的低 K 材料的设计提供了一种新策略。

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来源期刊

Macromolecules 工程技术-高分子科学

CiteScore

9.30

自引率

16.40%

发文量

942

审稿时长

2 months

期刊介绍： Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.