Researchers at Wageningen University & Research (WUR) have developed a new type of plastic that challenges long-standing materials theory. The material, called compleximer, combines two properties that rarely coexist. Designers can reshape it like glass when heated, yet it resists impact like conventional plastic when cooled.

Combining Processability And Toughness

Traditional glass shatters when dropped. Plastic cups survive impact but require moulds for shaping. Compleximers combine the advantages of both materials.

When heated, designers can knead and even blow the amber-coloured material into shape. Once cooled, it maintains strong impact resistance. This combination defies a long-standing rule in materials science. Typically, materials that process easily become more brittle. Compleximers break that pattern.

Although researchers have only produced small laboratory samples so far, the performance characteristics already suggest potential for façade panels, roofing systems, automotive body parts, interior elements and durable outdoor furniture.

A New Molecular Structure

The innovation lies in how the polymer chains connect. Conventional plastics rely on chemical crosslinks to bind long molecular chains together. These permanent bonds restrict movement and determine mechanical behaviour. Compleximers use a different strategy.

The material contains positively and negatively charged polymer segments. These opposite charges attract each other, much like magnets. The attraction creates strong physical bonds without permanent chemical crosslinking.

Because these electrostatic forces act over slightly greater distances, more space remains between the chains. This nanoscale structure likely explains the unusual combination of slow melting and high impact resistance. Researchers continue to investigate the exact mechanism.

The findings also connect to other charged materials, such as ionic liquids used in batteries and solar panels. These systems may belong to a broader, underexplored class of functional polymers.

Repairability And Circular Design Potential

The reversible physical bonds allow the material to reform when heated. If a crack appears in a panel or product component, users could apply heat and press the damaged area closed. Instead of replacing the entire product, they could restore it.

Most current plastics research concentrates on recycling. Compleximers shift attention towards lifespan extension and design for repair. This approach aligns closely with circular economy strategies in architecture, product design and automotive design.

At present, researchers produce the material from fossil-based raw materials. However, the team is actively developing biobased alternatives. A renewable version could combine high mechanical performance with reduced fossil dependency.

Towards A New Generation Of Functional Polymers

The research, published in Nature Communications, represents a fundamental breakthrough in polymer science. By demonstrating that charged polymer systems behave differently from traditional glassy materials, the team opens new directions for material development.

Source & photo: Wageningen University & Research