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<p>The poor degradability and limited recyclability of epoxy resins are key challenges hindering the efficient recycling of ex-service wind turbine blades (EWTBs). Herein, we proposed a selective degradation strategy for direct recycling and high-value recovery of epoxy resins by introducing degradable Schiff base groups into the molecular structure and utilizing the resulting oligomers as curing agents. To realize this strategy, a series of Schiff base compounds were synthesized using bio-based vanillin and diamines and subsequently functionalized with epichlorohydrin to yield bio-based epoxy resins. The cured epoxy resins demonstrated remarkable improvements in the mechanical properties of diglycidyl ether of bisphenol-A (DGEBA), with an increases of 44.49% in the tensile strength of 38.55%, bending strength, and impact strength of 71.20 %. The introduction of dynamic Schiff base bonds enabled the selective degradation of the vanillin-2,2-bis[4-(4-aminophenoxy)phenyl] propane-based epoxy resin (VBEP)/DGEBA copolymer, producing 84.20% oligomers that can be directly recycled and reused. Replacing 30 wt% of the curing agent with the oligomer increased the tensile strength of the cured sample to 75.40 MPa, surpassing that of the cured DGEBA. Under simulated acid rain and seawater exposure, the copolymer exhibited a service life of 27 years at 40 °C, significantly exceeding the currently reported service life of 20 years. This study presents a sustainable strategy for the direct recycling and high-value reuse of epoxy resin, offering a promising solution for EWTBs.</p>

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Directly High-value Reusability of Selective Degradable Epoxy Resins for Wind Turbine Blades

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Yu Wang,
  • Dan Li,
  • Yu Wu,
  • Tao-Rui Zhu,
  • Su-Fang Chen,
  • Jun-Heng Zhang,
  • Xiong-Jie Li,
  • Dao-Hong Zhang

摘要

The poor degradability and limited recyclability of epoxy resins are key challenges hindering the efficient recycling of ex-service wind turbine blades (EWTBs). Herein, we proposed a selective degradation strategy for direct recycling and high-value recovery of epoxy resins by introducing degradable Schiff base groups into the molecular structure and utilizing the resulting oligomers as curing agents. To realize this strategy, a series of Schiff base compounds were synthesized using bio-based vanillin and diamines and subsequently functionalized with epichlorohydrin to yield bio-based epoxy resins. The cured epoxy resins demonstrated remarkable improvements in the mechanical properties of diglycidyl ether of bisphenol-A (DGEBA), with an increases of 44.49% in the tensile strength of 38.55%, bending strength, and impact strength of 71.20 %. The introduction of dynamic Schiff base bonds enabled the selective degradation of the vanillin-2,2-bis[4-(4-aminophenoxy)phenyl] propane-based epoxy resin (VBEP)/DGEBA copolymer, producing 84.20% oligomers that can be directly recycled and reused. Replacing 30 wt% of the curing agent with the oligomer increased the tensile strength of the cured sample to 75.40 MPa, surpassing that of the cured DGEBA. Under simulated acid rain and seawater exposure, the copolymer exhibited a service life of 27 years at 40 °C, significantly exceeding the currently reported service life of 20 years. This study presents a sustainable strategy for the direct recycling and high-value reuse of epoxy resin, offering a promising solution for EWTBs.