Strong self-healing close-loop recyclable vitrimers via complementary dynamic covalent/non-covalent bonding
Article
Article Title | Strong self-healing close-loop recyclable vitrimers via complementary dynamic covalent/non-covalent bonding |
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ERA Journal ID | 3854 |
Article Category | Article |
Authors | Lynch, Mark, Wang, Cheng, Huo, Siqi, Ye, Guofeng, Zhang, Qi, Cao, Cheng-Fei, Wang, Hao, Song, Pingan and Liu, Zhitian |
Journal Title | Chemical Engineering Journal |
Article Number | 157418 |
Year | 2024 |
Publisher | Elsevier |
ISSN | 1385-8947 |
1873-3212 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.cej.2024.157418 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S1385894724089095 |
Abstract | Epoxy vitrimers represent a new class of high-performance sustainable resins because of their desired mechanical and thermally malleable properties. Unfortunately, existing epoxy vitrimers cannot self-heal at room temperature (R.T.) due to the trade-off between mechanical robustness, recyclability, and the ‘frozen’ state of vitrimer networks at R.T. Herein, a high-performance hyperbranched epoxy vitrimer (DCNC/50PEDA) via curing bis(2,3-epoxypropyl) cyclohex-4-ene-1,2-dicarboxylate (DCNC) with 50 wt% of a phosphorus/silicon-containing polyethyleneimine (PEDA) at R.T., and the key to this design lies in rationally integrating complementary dynamic non-covalent hydrogen-bonding and π-π stacking and covalent β-hydroxy ester bonds into the high-mobility branched units of the DCNC/50PEDA network. This design endows the vitrimer with a room-temperature self-healing efficiency up to 96.0 %, high mechanical strength reaching 36.0 MPa, and desired closed-loop recyclability. Moreover, its strong adhesion to a variety of substrates and exceptional fire retardancy, e.g., a limiting oxygen index of 39.0 % and a desired UL-94 V-0 rating, make it an outstanding fire-retardant coating for flammable substrates, such as wood. Such a performance portfolio enables DCNC/50PEDA to outperform existing self-healing polymer and vitrimers counterparts. This work establishes a promising complementary dynamic design protocol for creating self-healing, strong, recyclable, and fire-safe polymers by integrating dynamic non-covalent interactions and covalent bonds, which hold great real-world applications in industries, such as bulk materials, coatings, and adhesives. |
Keywords | Vitrimer; Room-temperature self-healing; Closed-loop recyclin; Mechanical robustness; Fire retardancy |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 401609. Polymers and plastics |
Byline Affiliations | School of Agriculture and Environmental Science |
Wuhan Institute of Technology, China | |
School of Engineering | |
Centre for Future Materials |
https://research.usq.edu.au/item/zq1zz/strong-self-healing-close-loop-recyclable-vitrimers-via-complementary-dynamic-covalent-non-covalent-bonding
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