Designing Greener Polymers - and Greener Polymer Scientists

From personal care and medicines, to transport and renewable energy, polymer science underpins the development of a sustainable future. Materials science students therefore require not only the chemical skills to engineer and characterise polymeric materials but the ability to evaluate the sustainability implications of the polymer design, production, application and end-of-life.<br/>This project involved redesigning the lab practical for the joint 4th year MEng/MSc Control and Design of Polymerisations module using the 12 Principles of Green Chemistry (PGC) as a sustainability framework. The aims were to reduce the impact of the lab practical, introduce end-of-life considerations at the polymer design stage, investigate green solvent use, minimise hazards, and ensure students retained equivalent practical competencies. <br/>The previous synthesis of polystyrene copolymers was replaced with the production of biodegradable poly(lactic acid) (PGC10) using biobased lactide (PGC7), organocatalyst 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU; PGC9) and green solvent 2-methyltetrahydrofuran (PGC5). This change enabled ~50 students to compare two polymerisation systems while prompting discussion on sustainable materials design. Students refined skills including weighing solids, micropipette use, polymer isolation by filtration and polymer characterisation. <br/>Compared to the original polystyrene practical, reactions temperature and time were reduced by 10 °C and 2 hours, leading to energy savings (PGC6). The designed protocol involved 18 fewer hazard codes and a threefold scale reduction, decreasing waste (PGC1) and reducing potential harm to the students and the environment (PGC3+12). Sustainability-focused learning objectives were strengthened through in-person discussions on degradable and biodegradable polymers and their role in future materials design. <br/>This work demonstrates how lab-based training can build essential practical skills while embedding sustainable thinking, offering a transferable model for integrating green chemistry into materials education.<br/>