利用柔性辅助刚性组改善环氧树脂导热性能的研究

IF 4.1 2区 化学 Q2 POLYMER SCIENCE Chinese Journal of Polymer Science Pub Date : 2024-08-20 DOI:10.1007/s10118-024-3163-z
Hong-Yu Zhu, Yan-Ji Zhu, Di Bao, Lu-Chao Pei, Fei Xu, Zhe Wang, Huai-Yuan Wang
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引用次数: 0

摘要

环氧树脂是一种交联聚合物材料,导热率通常较低。目前,在环氧树脂中引入刚性基团是提高其固有导热性的主要方法。研究人员探讨了环氧单体柔性链与改性环氧树脂(MEP)导热性之间的关系。柔性链长度对环氧交联结构中引入刚性基团的影响值得研究,这对改善聚合物的导热性及相关理论具有重要意义。我们通过简单的合成反应制备了含有长柔性链的小分子液晶(SMLC),并通过固化反应在环氧树脂中引入了刚性介晶单元。在高温固化过程中,引入的介晶单元发生了取向堆叠,并被固定在聚合物中。XRD 和 TGA 测试表明,改性环氧树脂内部的有序性得到了提高,从而改善了环氧树脂的导热性。最重要的是,在上述过程中,SMLC 的柔性链为联苯基团提供了排列空间,从而影响了 MEP 的导热性。具体来说,使用柔性链中含有六个碳原子的 SMLC-VI 固化的 MEP-VI 的导热系数最高,为 0.40 W-m-1-K-1,是 SMLC-IV 的导热系数 0.32 W-m-1-K-1 的 125%,是 SMLC-VIII 的导热系数 0.36 W-m-1-K-1 的 111%,是纯环氧树脂的导热系数 0.22 W-m-1-K-1 的 182%。为 SMLC 引入适当长度的柔性链可促进树脂中刚性基团的堆叠,同时减少链折叠的发生。这项研究将为提高交联聚合物材料的导热性提供新思路。
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Research on Improving the Thermal Conductivity of Epoxy Resin with Flexible Assisted Rigid Groups

Epoxy resins are cross-linked polymeric materials with typically low thermal conductivity. Currently, the introduction of rigid groups into epoxy resins is the main method to improve their intrinsic thermal conductivity. The researchers explored the relationship between the flexible chains of epoxy monomers and the thermal conductivity of the modified epoxy resins (MEP). The effect of flexible chain length on the introduction of rigid groups into the cross-linked structure of epoxy is worth investigating, which is of great significance for the improvement of thermal conductivity of polymers and related theories. We prepared a small molecule liquid crystal (SMLC) containing a long flexible chain via a simple synthesis reaction, and introduced rigid mesocrystalline units into the epoxy resin via a curing reaction. During high-temperature curing, the introduced mesocrystalline units underwent orientational stacking and were immobilized within the polymer. XRD and TGA tests showed that the ordering within the modified epoxy resin was increased, which improved the thermal conductivity of the epoxy resin. Crucially, during the above process, the flexible chains of SMLC provide space for the biphenyl groups to align and therefore affect the thermal conductivity of the MEP. Specifically, the MEP-VI cured with SMLC-VI containing six carbon atoms in the flexible chain has the highest thermal conductivity of 0.40 W·m−1·K−1, which is 125% of the thermal conductivity of SMLC-IV of 0.32 W·m−1·K−1, 111% of the thermal conductivity of SMLC-VIII of 0.36 W·m−1·K−1, and 182% of the thermal conductivity of pure epoxy of 0.22 W·m−1·K−1. The introduction of appropriate length flexible chains for SMLC promotes the stacking of rigid groups within the resin while reducing the occurrence of chain folding. This study will provide new ideas for the enhancement of thermal conductivity of cross-linked polymeric materials.

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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.
期刊最新文献
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