A research team in the UK has unveiled a new chemical recycling technique that could significantly improve how acrylic plastics are recovered and reused, addressing long-standing efficiency and quality challenges in plastic waste management.
Scientists at the University of Bath report that their method enables the breakdown of polymethyl methacrylate (PMMA) – commonly used in products such as transparent panels, automotive parts and construction materials – into its original chemical building blocks under comparatively mild conditions.
The findings, published in Nature Communications, point to a potentially scalable route for producing high-quality recycled plastics without the degradation typically associated with existing methods.
Moving beyond mechanical recycling limitations
Conventional recycling of acrylic plastics has relied heavily on mechanical processes, where materials are shredded or melted and reformed. While widely used, this approach has inherent drawbacks.
Repeated processing tends to degrade the material, leading to discolouration and reduced clarity. As a result, recycled PMMA is often unsuitable for applications requiring optical transparency, such as screens or lenses.
Chemical recycling has been explored as an alternative, particularly through pyrolysis. This process involves heating plastics to 350°C-400°C to break them down into monomers that can be reused.
Although effective in producing near-virgin materials, pyrolysis is energy-intensive and sensitive to contamination from mixed plastic waste streams, limiting its broader adoption.
Lower temperatures, higher efficiency
The newly reported method offers a different approach. Using ultraviolet light in an oxygen-free environment, the Bath researchers were able to depolymerise PMMA at significantly lower temperatures – between 120°C and 180°C.
This reduction in thermal demand could translate into lower operational costs and improved environmental performance.
According to the research team, the process achieves conversion rates exceeding 95%, with more than 70% of the material recovered as usable monomer. These monomers can then be purified and repolymerised into new acrylic plastics with properties comparable to virgin material.
This is a critical distinction in the context of circular economy goals. Rather than producing lower-grade outputs, the process enables repeated recycling cycles without substantial loss in material quality.
Implications for circularity in acrylic plastics
The ability to recover high-purity monomers from waste PMMA addresses a key bottleneck in plastic circularity.
Acrylic plastics are produced at a global scale of several million tonnes annually, yet effective recycling pathways remain limited.
By reducing both energy requirements and quality loss, the Bath team’s method could improve the economic feasibility of recycling PMMA.
High energy costs and inconsistent output quality have historically undermined investment in advanced recycling technologies. A process that mitigates both issues may be more attractive for industrial deployment.
Comparison with other emerging technologies
The study also situates itself within a growing field of chemical recycling innovation. Other recent work, including research from ETH Zurich, has demonstrated UV-driven depolymerisation of PMMA using chlorinated solvents. However, such solvents raise environmental and safety concerns.
In contrast, the Bath approach is compatible with more sustainable solvent systems, which may simplify regulatory approval and industrial integration. This distinction could prove significant as the sector moves toward greener process design.
Challenges in scaling up
Despite promising laboratory results, the technology remains at an early stage. Current experiments have been conducted on small quantities of real-world plastic waste, typically on the gram scale.
Scaling the process to handle industrial volumes will require further optimisation, particularly in reactor design and process efficiency.
The researchers indicate that ongoing work is focused on improving throughput and refining the system for larger-scale applications.
Outlook for chemical recycling
As regulatory pressure and corporate sustainability targets intensify, interest in advanced recycling technologies continues to grow.
Chemical recycling, in particular, is seen as a route to handle plastics that are difficult to recycle mechanically while preserving material value.
This latest development adds to a broader shift toward more sophisticated recycling strategies that prioritise both environmental performance and material integrity.
If successfully scaled, the method could contribute to a more circular lifecycle for acrylic plastics, reducing reliance on virgin petrochemical feedstocks and lowering overall emissions.