Research on Improving the Thermal Conductivity of Epoxy Resin with Flexible Assisted Rigid Groups  

作　　者：Hong-Yu Zhu Yan-Ji Zhu Di Bao Lu-Chao Pei Fei Xu Zhe Wang Huai-Yuan Wang 

机构地区：[1]School of Materials Science and Engineering,Tianjin University,Tianjin,300050,China [2]Collaborative Innovation Centre of Chemical Science and Engineering(Tianjin),Tianjin University,Tianjin,300072,China [3]Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology,Tianjin University,Tianjin,300072,China [4]School of Chemical Engineering and Technology and State Key Laboratory for Chemical Engineering,Tianjin University,Tianjin,300350,China

出　　处：《Chinese Journal of Polymer Science》2024年第11期1845-1854,I0015,共11页高分子科学（英文版）

基　　金：financially supported by the National Key R&D Program of China(No.2022YFB3808800);the National Science Foundation for Distinguished Young Scholars of China(No.51925403);the National Natural Science Foundation of China(Nos.52303102 and 22378309);Tianjin Research Innovation Project for Postgraduate Students(No.2022BKY060);Ningbo Science and Technology Innovation 2025 Major Special Project(No.2022Z112);Ningbo Natural Science Foundation(No.2022J016)。

摘　　要：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-Ⅵcured with SMLC-Ⅵcontaining six carbon atoms in the flexible chain has the highest thermal conductivity of 0.40W·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-Ⅷof 0.36W·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.

关 键 词：Epoxy Resin Polymer Thermal conductivity Rigid group Flexible chain 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]