A breakthrough in plastic technology could revolutionise industries like product design, automotive design, packaging design, and fashion. Researchers from Leiden University have developed a method to make thermoset plastics recyclable, offering a sustainable solution to reduce plastic waste and promote a circular economy.

The Challenge with Thermoset Plastics
Thermoset plastics are known for their strength, heat resistance, and durability, making them essential for products such as cookware handles, electrical plugs, automotive parts, and brake pads. Unlike traditional plastics, thermosets cannot be melted down and reshaped, which makes them difficult to recycle. As a result, most thermoset waste ends up in landfills or is incinerated, contributing to environmental pollution and resource depletion.

A Smart Solution: Dynamic Bonds
To address this challenge, chemist Roxanne Kieltyka and PhD student Mertcan Özel from the Leiden Institute of Chemistry have developed a method that incorporates squaramides—special chemical units that create dynamic bonds. Unlike conventional thermosets that require extreme heat and harsh chemicals to break down, this innovative material can be reprocessed in mild conditions. As Özel explains, “Squaramides can form and break bonds under the right conditions, enabling us to design plastics that are both strong and recyclable.”

How Does It Work?
Squaramides engage in strong yet reversible hydrogen bonding, allowing the material to soften without losing its structural integrity. This reversible bonding can be achieved without additional chemicals or catalysts, making the recycling process more energy-efficient and cost-effective. Instead of being discarded, old materials can be reshaped into new products with minimal waste.

Testing for Practical Use
To ensure the material is suitable for real-world applications, Özel is conducting tests to assess its long-term performance, including how it reacts to heat, stress, and repeated recycling. By measuring mechanical strength, thermal stability, and chemical resistance, the team aims to optimise the material’s properties, striking the right balance between performance and recyclability.

A Step Towards a Circular Economy
This innovation aligns with the global shift towards a circular economy, where materials are reused rather than wasted. Creating recyclable thermosets could transform industries that rely heavily on plastic, from automotive manufacturing and consumer goods to packaging and fashion accessories. If successful, this technology could reduce plastic waste, lower greenhouse gas emissions, and make sustainable materials more accessible.

Next Steps
The researchers are now focused on fine-tuning the material’s properties and testing it in real-world conditions. They also aim to collaborate with industry partners to guide the development of this material for commercial applications. Kieltyka is optimistic about the impact of this technology, stating, “If we can bring this to market, it could be a game-changer for plastic recycling.”

Source: Leiden University