Abstract
Vitrimer uniquely simultaneously combines the opposed thermoset-like properties (mechanical properties, durability, creep/solvent resistance) and thermoplastic-like properties (reshapability, recyclability), thus arousing great enthusiasms in the design, preparation and characterization of vitrimer. From a practical point of view, it is of great value to develop one-step and scalable synthetic procedures for high performance vitrimers. Starting from two highly available and non-expensive commodity materials, namely, ethylene acrylic acid copolymer (EAA) and triglycidyl isocyanurate (TGIC), a series of EAA-TGIC vitrimer materials with varying cross-linking degrees were prepared via a one-step, scalable and practical synthetic approach. Under mild melt compounding conditions, ring-opening of epoxy groups towards carboxyl groups in EAA occurred, resulting in cross-linking of EAA by dynamic β-hydroxyl ester covalent bonds. The formation of covalent cross-linking network in EAA-based vitrimer materials was proved by FTIR and swelling test. The thermo-mechanical, tensile, reprocessing and thermal properties of EAA-TGIC vitrimer were systematically studied. The results showed that EAA-TGIC vitrimer with high gel contents, and thus, excellent solvent resistances, were achieved. Tensile tests revealed that EAA-TGIC vitrimers exhibited premium mechanical properties with well-balanced rigidity and toughness and that the mechanical properties of recovered EAA-TGIC vitrimer remained almost unchanged compared to those of as-prepared EAA-TGIC vitrimer. This study offers a long sought-after solution for the cost-effective recycling of cross-linked polyethylenes and provides new possibilities for keeping difficult-to-recycle cross-linked polyethylenes in the circular loop.
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The authors declare that the data supporting the findings of this study are available within the paper and its Supplementary Information files. Should any raw data files be needed in another format they are available from the corresponding author upon reasonable request.
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Acknowledgements
YJ Zhang express special thanks to Ju Yi, chief of Shanghai Co-polymer Chemicals Co., Ltd.
Funding
The work was supported by a grant from the Department of Education of Liaoning (General Program, Grant No. LJKMZ20220902). Sponsored by CNPC Innovation Found (2021DQ02-0706).
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Y. Zhang and Z. Lin conceived the study, designed the experiments, and wrote the manuscript. Z. Lin performed most of the experiments. X. Li and G. Li helped in discussing the results and polishing the language. All authors reviewed the manuscript.
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Zhang, Y., Lin, Z., Li, X. et al. One-step and Scalable Synthesis of EAA-based Reprocessable Vitrimer with Superior Mechanical Properties. J Polym Environ 32, 1080–1089 (2024). https://doi.org/10.1007/s10924-023-03030-6
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DOI: https://doi.org/10.1007/s10924-023-03030-6