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Innovative epoxy resin combines fire safety, recyclability and high performance

Researchers at Sichuan University have developed a new type of epoxy resin that not only offers enhanced fire retardancy but is also recyclable and degradable, making it an ideal candidate for high-strength adhesives in various industries.

This innovation addresses a critical gap in the market for thermosetting polymers that can be easily recycled without compromising on safety and performance.

The study, led by Prof. Li Chen, introduces a phosphorus-containing anhydride into the epoxy resin's composition, which is cured using an anhydride-epoxy curing equilibrium with triethanolamine as a transesterification modifier.

This process results in epoxy vitrimers and carbon fiber-reinforced epoxy composites (CFRECs) that are malleable, reprocessable, and can be hydrothermally degraded with ease. The work is in Frontiers of Chemical Science and Engineering.

The new epoxy resin stands out with its exceptional flame retardancy, achieving a high glass transition temperature (Tg) of 192°C, which is crucial for applications in aerospace, automotive, and wind power industries where materials must withstand high temperatures. Moreover, the resin's ability to degrade in water at 200°C without the need for any external catalyst is a significant step toward more environmentally friendly recycling processes.

One of the key highlights of this research is the successful recycling of carbon fibers from the composite material without damage, a challenge that has plagued the recycling of traditional CFRECs. The recycled fibers maintain their structural integrity, and the degradation products are put to use in creating a recyclable adhesive with a peel strength of 3.5 MPa, demonstrating the potential for a circular economy in epoxy resin use.

The social and environmental value of this research is profound. With the global issue of plastic waste reaching crisis levels, the development of sustainable thermosetting polymers is more critical than ever. This epoxy resin provides a solution that not only reduces pollution but also conserves resources by enabling the reuse of degradation products.

The novelty of this research lies in its multifaceted approach to material development. By integrating fire safety, recyclability, and high performance into a single material, the researchers have created a game-changer for industries that rely on epoxy resins. The potential applications are vast, from construction and transportation to electronics and renewable energy.

In conclusion, the epoxy resin developed by the team at Sichuan University represents a significant leap forward in materials science. It offers a sustainable solution to the recycling challenges faced by thermosetting polymers while providing superior performance characteristics. As the world moves towards more sustainable practices, this innovation could pave the way for a new generation of materials that are not only functional but also kind to the planet.