Hong-Yu Zhu, Yan-Ji Zhu, Di Bao, Lu-Chao Pei, Fei Xu, Zhe Wang, Huai-Yuan Wang
{"title":"利用柔性辅助刚性组改善环氧树脂导热性能的研究","authors":"Hong-Yu Zhu, Yan-Ji Zhu, Di Bao, Lu-Chao Pei, Fei Xu, Zhe Wang, Huai-Yuan Wang","doi":"10.1007/s10118-024-3163-z","DOIUrl":null,"url":null,"abstract":"<p>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 <i>via</i> a simple synthesis reaction, and introduced rigid mesocrystalline units into the epoxy resin <i>via</i> 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<sup>−1</sup>·K<sup>−1</sup>, which is 125% of the thermal conductivity of SMLC-IV of 0.32 W·m<sup>−1</sup>·K<sup>−1</sup>, 111% of the thermal conductivity of SMLC-VIII of 0.36 W·m<sup>−1</sup>·K<sup>−1</sup>, and 182% of the thermal conductivity of pure epoxy of 0.22 W·m<sup>−1</sup>·K<sup>−1</sup>. 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.</p>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":null,"pages":null},"PeriodicalIF":4.1000,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Research on Improving the Thermal Conductivity of Epoxy Resin with Flexible Assisted Rigid Groups\",\"authors\":\"Hong-Yu Zhu, Yan-Ji Zhu, Di Bao, Lu-Chao Pei, Fei Xu, Zhe Wang, Huai-Yuan Wang\",\"doi\":\"10.1007/s10118-024-3163-z\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>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 <i>via</i> a simple synthesis reaction, and introduced rigid mesocrystalline units into the epoxy resin <i>via</i> 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<sup>−1</sup>·K<sup>−1</sup>, which is 125% of the thermal conductivity of SMLC-IV of 0.32 W·m<sup>−1</sup>·K<sup>−1</sup>, 111% of the thermal conductivity of SMLC-VIII of 0.36 W·m<sup>−1</sup>·K<sup>−1</sup>, and 182% of the thermal conductivity of pure epoxy of 0.22 W·m<sup>−1</sup>·K<sup>−1</sup>. 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.</p>\",\"PeriodicalId\":517,\"journal\":{\"name\":\"Chinese Journal of Polymer Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.1000,\"publicationDate\":\"2024-08-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Chinese Journal of Polymer Science\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1007/s10118-024-3163-z\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"POLYMER SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chinese Journal of Polymer Science","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1007/s10118-024-3163-z","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
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.
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.