Rational design and efficient synthesis of cyclic polymers with visualized molecular topology and unique dielectric properties

IF 4.5 3区 工程技术 Q1 CHEMISTRY, APPLIED
Hao Wang, Qiubo Wang, Xiaojuan Liao, Ruyi Sun, Meiran Xie
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引用次数: 0

Abstract

Cyclic polymers without chain ends have attracted increasing attention because of the unique physical properties. However, the direct visualization of cyclic topology remains a formidable challenge, because the cyclic chains with flexible backbone or strong intramolecular interaction usually existed in a coiled state rather than cyclic topology. Herein, monocyclic and bicyclic polymers were prepared via blocking-cyclization technique, and the molecular topology of cyclic polymer containing phenyl pendant was directly observed depending on the reduced intrachain entanglement. The structure and characteristics of cyclic polymers were investigated, and the difference between cyclic polymer and linear counterpart was demonstrated. Compared to linear polymer, cyclic polymer exhibited improved dielectric properties, and bicyclic polymer displayed further increased dielectric constant and energy storage density than monocyclic polymer possessing the same repeating units. Therefore, this research presents a facile strategy in the design and construction of cyclic polymers with directly visualized topology and unique dielectric properties.

Abstract Image

合理设计和高效合成具有可视化分子拓扑结构和独特介电性能的环状聚合物
无链端的环状聚合物因其独特的物理特性而日益受到关注。然而,由于具有柔性骨架或强分子内相互作用的环链通常以盘绕状态而非环状拓扑结构存在,因此直接观察环状拓扑结构仍然是一项艰巨的挑战。本文通过封端环化技术制备了单环和双环聚合物,并根据链内缠结的减少直接观察了含苯基悬垂环聚合物的分子拓扑结构。研究了环状聚合物的结构和特性,并证明了环状聚合物与线性聚合物的区别。与线性聚合物相比,环状聚合物具有更好的介电性能,与具有相同重复单元的单环聚合物相比,双环聚合物的介电常数和储能密度进一步提高。因此,这项研究为设计和构建具有直接可视拓扑结构和独特介电性能的环状聚合物提供了一种简便的策略。
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来源期刊
Reactive & Functional Polymers
Reactive & Functional Polymers 工程技术-高分子科学
CiteScore
8.90
自引率
5.90%
发文量
259
审稿时长
27 days
期刊介绍: Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.
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