Wood-Derived Celluplastic Combines High Performance With Circularity

Researchers have developed a cellulose-based bioplastic that combines strength, flexibility and transparency. The material, called ‘celluplastic’, also supports closed-loop recycling and complete biodegradation. It could provide a sustainable alternative for packaging, products and interior components.

A Multiscale Cellulose Structure

Celluplastic contains different forms of cellulose, a natural polymer found in wood and other plants. The researchers combined microfibrillated cellulose, cellulose nanorods and modified cellulose chains. Together, these elements form a layered network across several scales.

This structure gives the colourless material a combination of strength and flexibility. Tests recorded a tensile strength of more than 30 MPa. The material can also stretch to more than twice its original length before breaking. Its performance therefore matches the range of several common fossil-based plastics.

Celluplastic also behaves like conventional plastic under pressure. For example, parts of the material turn white when stretched. Researchers call this effect stress whitening. It shows how the structure absorbs and spreads mechanical energy.

Recycling With Water

The material’s closed-loop recycling system offers one of its main advantages. Manufacturers can disperse celluplastic in water and reassemble the cellulose network into a new material. The process does not chemically break down the cellulose.

During tests, researchers repeated this recycling process more than 100 times. The material kept its structure and mechanical properties throughout these cycles. In contrast, many existing bioplastics lose quality during recycling or remain difficult to process.

Water-based recycling may also reduce the need for harsh chemicals. However, researchers still need to study energy use, production costs and industrial performance. These factors will determine whether manufacturers can produce and recycle celluplastic at scale.

Biodegradation At The End Of Its Life

Celluplastic also offers another end-of-life route if it leaves the recycling system. In soil burial tests, the material broke down completely within several weeks. Conventional plastics, by comparison, can remain in the environment for decades or centuries.

This combination could make celluplastic useful to packaging and product designers. The material uses a renewable resource, delivers plastic-like performance and supports repeated recycling. It can also biodegrade in soil. The research therefore presents a promising approach to materials for a more circular plastics economy.

Source: Science China Press via EurekAlert!
Photo: Marie Martin