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Researchers discover new route to recyclable polymers from plants

New route to recyclable polymers from plants
A transparent film made from the new recyclable polymer developed in this study. Credit: Feng Li

Researchers at Hokkaido University have taken a significant step forward in the drive to make recyclable yet stable plastics from plant materials. This is a key requirement to reduce the burden of plastic pollution in the environment. They developed a convenient and versatile method to make a variety of polymers from chemicals derived from plant cellulose; crucially, these polymers can be fully recycled. The method was published in the journal ACS Macro Letters.

Cellulose is one of the most abundant components of biomass derived from plants, being a key part of the tough cell walls surrounding all plant cells. It can be readily obtained from plant wastes, such as straw and sawdust, therefore, using it as a feedstock for manufacture should not reduce the availability of agricultural land for food production.

Cellulose is a long-chain polysaccharide polymer, meaning that it is composed of multiple sugar groups, specifically glucose, linked together by .

To make their new polymers, the Hokkaido team used two commercially available small molecules, levoglucosenone (LGO) and dihydrolevoglucosenone (Cyrene), which are made from cellulose. They developed novel chemical processes to convert LGO and Cyrene into a variety of unnatural polysaccharide polymers. Varying the precise chemical structure of the polymers offers the ability to generate different materials for a range of possible applications.

New route to recyclable polymers from plants
From left: Toshifumi Satoh, Yuta Mizukami, Feng Li, and Takuya Isono of the research team. Credit: Feng Li

"Our biggest challenges were controlling the polymerization reaction that links the smaller monomer molecules together, and obtaining polysaccharides materials that are sufficiently stable for common applications while still able to be broken up and recycled by specific chemical conditions," says Assistant Professor Feng Li, a corresponding author.

Li adds that the biggest surprise during the research was the high transparency of the polymer films they made, which might be crucial for the kind of specialist applications that these polymers seem most suited for. "As the materials are quite rigid it may be difficult to use them as flexible plastic materials, such as plastic bags, so I expect they will be more suited for high-performance materials for optical, electronic, and ," Professor Toshifumi Satoh, the other corresponding author, adds.

Other research groups around the world are also exploring the potential for making plastic-replacing polymers from plants, and some such 'bioplastics' are already commercially available, but Satoh's group has added a significant new opportunity to this fast-developing field.

The team now plans to explore further possibilities, but the feasible structural variations are so numerous that they would like to join forces with specialists in , and automated synthesis to explore the options.

"We hope this work will develop a wide variety of useful unnatural polysaccharide polymers to become part of a sustainable closed loop of synthesis from biomass with efficient recycling," Li concludes.

More information: Yuta Mizukami et al, Chemically Recyclable Unnatural (1→6)-Polysaccharides from Cellulose-Derived Levoglucosenone and Dihydrolevoglucosenone, ACS Macro Letters (2024). DOI: 10.1021/acsmacrolett.3c00720

Citation: Researchers discover new route to recyclable polymers from plants (2024, March 21) retrieved 20 May 2024 from https://phys.org/news/2024-03-route-recyclable-polymers.html
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