By the end of this topic, you should be able to...
explain how biomaterials are a key part of a circular economy and can be used by designers to design out waste.
Guiding Question
How do material properties and classifications aid material selection for a specified manufacturing process?
💡 Did You Know? Every year, humans produce 380 million tonnes of plastic—and 91% of it never gets recycled. What if the solution isn't better recycling, but materials that were never meant to last forever?
Why Consider Biodegradable Materials?
A circular economy isn't about managing waste more efficiently—it's about designing waste out of existence. Traditional materials lock us into a linear "take-make-dispose" model: extract resources, manufacture products, then bury them in landfills for centuries. Biodegradable materials—derived from renewable biological sources like algae, mycelium, corn starch, or agricultural waste—break this cycle by returning safely to natural systems at end-of-life. But here's the critical design thinking shift: biomaterials aren't just "eco-friendly alternatives."
When used strategically, they enable designers to close material loops, eliminate toxic additives, reduce dependence on fossil fuels, and create products where decomposition becomes a feature, not a failure. This isn't compromise; it's innovation that aligns human systems with planetary boundaries.
Case in Point
Notpla, a London-based startup, manufactures food packaging from seaweed and plants that biodegrades in 4–6 weeks—or can be eaten. Originally designed for marathon water sachets (eliminating thousands of plastic cups), Notpla's material has expanded to takeaway containers and cosmetics packaging. The material doesn't just "break down"; it's designed to disappear, turning packaging from a 500-year pollution problem into a nutrient that re-enters soil ecosystems. This is circular design in action.
Learning Goals
In this topic, you'll explore how biomaterials work at a molecular level, evaluate their performance trade-offs, and learn how to integrate them into design strategies that eliminate waste before it's created—essential knowledge for your IA and the future of responsible design.
Linking Questions
Why is a good understanding of material properties important when designing structural systems? (A3.2)
When do the physical properties of materials restrict the ability to use certain prototyping techniques? (A2.2)
How do the properties of a material influence the choice of manufacturing techniques for a product? (A4.1)
How can the characteristics of a material limit the effectiveness of modelling and prototyping as designs are developed? (B2.2)
How important is an understanding of the mechanical properties of a material when considering structural and mechanical systems, and their applications? (A3.2, A3.3, B3.2, B3.3)
Which classifications of properties are important when developing electronic systems and their applications? (A3.4, B3.4)
How could the continued development of biodegradable materials influence designers’ ability to address aspects of design for sustainability and design for a circular economy? (C2.1, C2.2)
Why is a thorough understanding of materials key for effective product analysis and evaluation of products? (C3.1)
How do design decisions related to the properties of materials and components impact a product’s life-cycle analysis? (C3.2)