Ortho-, Meta-, versus Para-Substituted Mesogens Inducing Higher-Order Structures for Highly Thermal-Conductive Cured Epoxy Resins

IF 5.1 1区化学 Q1 POLYMER SCIENCE

Macromolecules Pub Date : 2024-11-24 DOI:10.1021/acs.macromol.4c00506

Rika Marui, Hayato Maeda, Kan Hatakeyama-Sato, Yuta Nabae, Teruaki Hayakawa

引用次数: 0

Abstract

Mesogenic monomers are beneficial, but few studies have investigated the effects of the molecular structure of liquid crystalline epoxy monomers on the higher-order structure and thermal conductivity of their cured resins to obtain highly thermally conductive and insulating epoxy resins. This study focused on the symmetry of the mesogenic part. Four different epoxy monomers were copolymerized with 1,4-phenylenediamine. Cured resins form a nematic-like network. Molecules array more orderly in epoxy resin with the most symmetric epoxy monomer. The thermal conductivities of epoxy resin prepared with ortho-, meta-, and para-substituted epoxy monomer were 0.26, 0.31, and 0.44 W m^–1 K^–1, respectively. Epoxy resin with the most symmetric epoxy monomer showed over 1.7 times as high as epoxy resin with low symmetric epoxy monomer. It is clarified that the symmetricity of the primary structure of epoxy monomer is an essential factor for the higher-order structure and thermal conductivity of cured epoxy resin.

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正、元、对取代中间体诱导高导热固化环氧树脂的高阶结构

中生单体是有益的，但很少有研究调查液晶环氧单体的分子结构对其固化树脂的高阶结构和导热性能的影响，从而获得高导热性和绝缘性的环氧树脂。这项研究的重点是中生部分的对称性。四种不同的环氧单体与 1,4-苯二胺共聚。固化后的树脂形成类似向列型的网络。在对称性最强的环氧单体的环氧树脂中，分子排列更加有序。使用正、偏和对位取代环氧单体制备的环氧树脂的导热系数分别为 0.26、0.31 和 0.44 W m-1 K-1。使用对称性最高的环氧单体制备的环氧树脂是使用对称性较低的环氧单体制备的环氧树脂的 1.7 倍以上。这说明环氧单体初级结构的对称性是影响固化环氧树脂高阶结构和导热系数的重要因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.