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

Gui-Lian Shi ¹Ting-Cheng Li ¹Dao-Hong Zhang ¹Jun-Heng Zhang²

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作者信息

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. 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;State Key Laboratory of New Textile Materials and Advanced Processing Technologies,Wuhan Textile University,Wuhan 430200,China;Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials,Hubei University,Wuh
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Abstract

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 cova-lent 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,giv-ing 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 reinforc-ing 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 demon-strated 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.

Key words

Epoxy resin/Hyperbranched ionic liquid/Recycling/Carbon fiber/Composites

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基金项目

National Natural Science Foundation of China(U23A2069)

National Natural Science Foundation of China(51403242)

Natural Science Foundation of Hubei Province(2024AFB800)

Fundamental Research Funds for the Central Universities,South-Central Minzu University(CZY23017)

Fundamental Research Funds for the Central Universities,South-Central Minzu University(CZD24001)

Innovation Group of National Ethnic Affairs Commission of China(MZR20006)

Fund for Academic Innovation Teams of South-Central Minzu University(XTZ24012)

Scientific Research Platforms of South-Central Minzu University(PTZ24013)

Open Fund for Key Lab of Guangdong High Property and Functional Macromolecular Materials,China(20240007)

State Key Laboratory of New Textile Materials and Advanced Processing Technologies(FZ20230012)

出版年

2024

高分子科学(英文版)

中国化学会　中国科学院化学研究所

高分子科学(英文版)

CSTPCDCSCD

影响因子：0.721

ISSN：0256-7679

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参考文献量64

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