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By: Anita Gaur, Kundan Singh, and Nishi Tyagi.
1Assistant Professor, Department of Industrial Chemistry, Lajpat Rai College, Sahibabad, India.
2Student, Department of Industrial Chemistry, Lajpat Rai College, Sahibabad, India.
Thermoset polymers are widely used in advanced engineering applications due to their excellent mechanical strength, thermal resistance, and chemical stability. However, their permanent three-dimensional cross-linked networks make them traditionally non-recyclable, contributing significantly to polymer waste and environmental challenges. In recent years, dynamic covalent chemistry (DCC) has emerged as a transformative approach for designing recyclable thermoset materials by incorporating reversible and exchangeable bonds within their structure. This project focuses on the study of recyclable thermoset polymers that utilize dynamic covalent bonds such as transesterification, imine exchange, disulfide exchange, and reversible Diels–Alder reactions. These dynamic bonds allow the polymer network to undergo reshaping, self-healing, and reprocessing under controlled conditions, giving rise to a new class of materials known as vitrimers. The research explores the mechanisms, properties, advantages, and limitations of such systems, along with their potential applications in aerospace, automotive, electronics, adhesives, and sustainable material design. By reviewing recent literature and analyzing the scientific principles behind dynamic covalent thermosets, this project highlights their importance in moving toward a circular materials economy. The study underlines how recyclable thermosets can play a crucial role in reducing waste and promoting environmentally responsible polymer technology.
Citation:
Refrences:
- Compares different types of dynamic bonds (associative vs. dissociative) and their recyclability—useful for comparing mechanisms (e.g., transesterification vs Diels–Alder/disulfide/imine). Int Polym Process. 2025;40(1):1–33.
- Recent advances and challenges in the mechanical and chemical recycling of vitrimers and fibre-reinforced vitrimer composites: a review. Compos Part B Eng. 2025;306:112760.
- Biobased vitrimers: a sustainable future. Sustain Polym Energy. 2024;2(3):10007.
- Mariani A, Malucelli G. Biobased vitrimers: towards sustainability and circularity. Chem Commun. 2025;61(11):2173–89.
- Ghosh S, Chatterjee A, Dey N, Mishra S, Bhardwaj S, Singh S, et al. Impact of nanofillers on vitrimerization and recycling strategies: a review. Nanoscale Adv. 2025;7(19):5842–87.
- Guerre M, Taplan C, Winne JM, Du Prez FE. Vitrimers: directing chemical reactivity to control material properties. Chem Sci. 2020;11(19):4855–70.
- Sharma H, Rana S, Singh P, Hayashi M, Binder WH, Rossegger E, et al. Self-healable fiber-reinforced vitrimer composites: overview and future prospects. RSC Adv. 2022;12(50):32569–82.
- Karatrantos AV, Couture O, Hesse C, Schmidt DF. Molecular simulation of covalent adaptable networks and vitrimers: a review. Polymers (Basel). 2024;16(10):1373.
- Rashid MA, Liu W, Wei Y, Jiang Q. Review of intrinsically recyclable biobased epoxy thermosets enabled by dynamic chemical bonds. Polym Plast Technol Mater. 2022;61(16):1740–82.
- Fan X, Zheng J, Yeo JC, Wang S, Li K, Muiruri JK, et al. Dynamic covalent bonds enabled carbon fiber reinforced polymers recyclability and material circularity. Angew Chem. 2024;136(40):202408969.