A team of researchers from the University of Bayreuth, led by Prof. Dr. Rhett Kempe, has made a significant discovery in the field of plastics technology. Their research, published in Advanced Science , presents a closed-loop recycling loop for Low Density Polyethylene (LDPE), one of the most commonly used plastics that has previously been difficult to recycle. This new material could be a game-changer for the plastics industry and the environment.

The research team at the University of Bayreuth has developed a plastic material that is similar to LDPE in its chemical structure, but can be produced in a much more sustainable manner and recycled more easily. “We have introduced a new, chemically recyclable, highly branched polyolefin material,” explains Prof. Dr. Rhett Kempe. The integration of “recycling points” into the plastic enables it to be efficiently broken down into smaller fragments, which can then be reused in a closed cycle.

Conventional production of LDPE requires extremely high temperatures and pressure (250 °C with 2,500 to 4,000 bar), which means significant energy expenditure. The Bayreuth scientists have found an alternative approach: “The key to success is the use of our new catalysts, which produce defined building blocks of a certain size under appropriate mild reaction conditions, around 70 degrees Celsius and two bar pressure,” says Kempe. This process not only significantly reduces energy consumption, but also offers the possibility of targeted production of plastic structures.

Future of the plastics industry

This development shows great potential for sustainable alternatives in the plastics industry. Not only does it improve the recyclability of plastics, it also sets a new standard for energy-saving production. The support from the German Research Foundation (DFG) and SASOL Germany GmbH underlines the importance and potential of this research.

The work of the Bayreuth researchers marks significant progress in the development of sustainable plastic materials. With their approach, they offer a practical solution to one of the plastics industry’s most pressing problems: the need to extend the life of plastics through efficient recycling while making the production process more environmentally friendly.

https://www.uni-bayreuth.de/en

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