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Recyclable High-performance Carbon fiber Reinforced epoxy composites Based on Dithioacetal Covalent Adaptive Network

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CHINESE JOURNAL OF POLYMER SCIENCE 2024年第10期42卷 1514-1524页

作者： Shi, Gui-Lian Li, Ting-Cheng Zhang, Dao-Hong Zhang, Jun-Heng South Cent Minzu Univ Hubei R&D Ctr Hyperbranched Polymers Synth & Appli Key Lab Catalysis & Energy Mat Chem Minist Educ Wuhan 430074 Peoples R China South Cent Minzu Univ Hubei R&D Ctr Hyperbranched Polymers Synth & Appli Hubei Key Lab Catalysis & Mat Sci Wuhan 430074 Peoples R China Wuhan Text Univ State Key Lab New Text Mat & Adv Proc Technol Wuhan 430200 Peoples R China Hubei Univ Key Lab Green Preparat & Applicat Funct Mat Minist Of Educ Wuhan 430062 Peoples R China

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 degrees C, 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 fiber/epoxy composites IMPROVEMENT

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