Recyclable High-performance Carbon Fiber Reinforced Epoxy Composites Based on Dithioacetal Covalent Adaptive Network  

作　　者：Gui-Lian Shi Ting-Cheng Li Dao-Hong Zhang Jun-Heng Zhang 

机构地区：[1]Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education&Hubei Key Laboratory of Catalysis and Materials Science,Hubei R&D Center of Hyperbranched Polymers Synthesis and Applications,South-Central Minzu University,Wuhan,430074,China [2]State Key Laboratory of New Textile Materials and Advanced Processing Technologies,Wuhan Textile University,Wuhan,430200,China [3]Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials,Hubei University,Wuhan,430062,Chin

出　　处：《Chinese Journal of Polymer Science》2024年第10期1514-1524,I0011,共12页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.U23A2069 and 51403242);the Natural Science Foundation of Hubei Province(No.2024AFB800);the Fundamental Research Funds for the Central Universities,South-Central Minzu University(Nos.CZY23017 and CZD24001);the Innovation Group of National Ethnic Affairs Commission of China(No.MZR20006);the Fund for Academic Innovation Teams of South-Central Minzu University(No.XTZ24012);Scientific Research Platforms of South-Central Minzu University(No.PTZ24013);the Open Fund for Key Lab of Guangdong High Property and Functional Macromolecular Materials,China(No.20240007);State Key Laboratory of New Textile Materials and Advanced Processing Technologies(No.FZ20230012)。

摘　　要：Recycling of carbon fiber reinforced composites is important for sustainable development and the circular economy.Despite the use of dynamic chemistry,developing high-strength recyclable CFRPs remains a major challenge due to the mutual exclusivity between the dynamic and mechanical properties of materials.Here,we developed a high-strength recyclable epoxy resin(HREP)based on dynamic dithioacetal covalent adaptive network using diglycidyl ether bisphenol A(DGEBA),pentaerythritol tetra(3-mercapto-propionate)(PETMP),and vanillin epoxy resin(VEPR).At high temperatures,the exchange reaction of thermally activated dithioacetals accelerated the rearrangement of the network,giving it significant reprocessing ability.Moreover,HREP exhibited excellent solvent resistance due to the increased cross-linking density.Using this high-strength recyclable epoxy resin as the matrix and carbon fiber modified with hyperbranched ionic liquids(HBP-AMIM+PF6-)as the reinforcing agent,high performance CFRPs were successfully prepared.The tensile strength,interfacial shear strength(IFSS)and interlaminar shear strength(ILSS)of the optimized formulation(HREP20/CF-HBPPF6)were 1016.1,70.8 and 76.0 MPa,respectively.In addition,the CFRPs demonstrated excellent solvent and acid/alkali-resistance.The CFRPs could completely degrade within 24 h in DMSO at 140℃,and the recycled CF still maintained the same tensile strength and ILSS as the original after multiple degradation cycles.

关 键 词：Epoxy resin Hyperbranched ionic liquid Recycling Carbon fiber Composites 

分 类 号：TB332[一般工业技术—材料科学与工程]