4.7 Article

Recyclable, reprocessable, self-healing elastomer-like epoxy vitrimer with low dielectric permittivity and its closed-loop recyclable carbon fiber reinforced composite

Journal

COMPOSITES PART B-ENGINEERING
Volume 257, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2023.110666

Keywords

Epoxy vitrimer; Self-healing; Dielectric permittivity; Closed-loop recyclable CFRPs

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In this study, a novel closed-loop recyclable elastomer-like epoxy vitrimer (ETOD-SA) was fabricated by combining siloxanes and dynamic transesterification reaction. ETOD-SA exhibited high stretchability, low dielectric permittivity, reversible deformation, and rapid self-healing. The epoxy vitrimer material showed excellent shape memory and reprocessing properties. Furthermore, carbon fiber reinforced ETOD-SA composite (ETOD-SA-CF) displayed remarkable self-healing, shape memory, and degradable properties, with the potential for application in recyclable carbon fiber reinforced composites.
Epoxy resin with reprocessable, strong mechanical property and mutil-functions (such as recyclable and dielectric properties) shows great prospects in many applications, but it is still a huge challenge. Herein, we combine siloxanes and dynamic transesterification reaction to fabricate a novel closed-loop recyclable elastomer-like epoxy vitrimer (ETOD-SA) with high stretchability (135%), low dielectric permittivity (2.75), reversible deformation (30 cycles) as well as rapid self-healing (10 min for a 36 & mu;m scratch). The ETOD-SA is optimized to achieve excellent shape memory and reprocessing properties due to dynamic transesterification reactions cata-lyzed by internal tertiary amines in the structure of ETOD-SA vitrimer. Furthermore, carbon fiber reinforced ETOD-SA composite (ETOD-SA-CF) also exhibits excellent self-healing, shape memory, degradable properties and has prospective application in recyclable carbon fiber reinforced composite. Due to the rapid chemical degra-dation of ETOD-SA under mild conditions in the presence of ethanol or butylamine, carbon fibers (CFs) of ETOD-SA-CF can be effectively recycled in a closed loop. The performance of recycled carbon fibers are similar to those of original ones, with almost the same chemical structure and mechanical properties. These results provide an important strategy for the development of mutil-functions epoxy vitrimer materials and their practical appli-cations in the closed-loop recycling of CFs from carbon fiber reinforced composites (CFRPs).

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