Scientists challenge fossil-based plastics with PET-like structure from non-edible plants

05 Jul 2022 --- The Swiss Federal Institute of Technology Lausanne (EPFL) in Switzerland is unveiling a PET-like plastic “made easily” from the non-edible parts of plants. The plastic is tough, heat-resistant, and a good barrier to gasses like oxygen, making it a promising candidate for food packaging, the EPFL scientists say.

Due to its structure, the new plastic can also be chemically recycled and degrade back to harmless sugars in the environment.

“It is becoming increasingly obvious that moving away from fossil fuels and avoiding the accumulation of plastics in the environment are key to addressing the challenge of climate change. In that vein, there are considerable efforts to develop degradable or recyclable polymers made from non-edible plant material referred to as ‘lignocellulosic biomass,’” the scientists explain.

However, producing competitive biomass-based plastics is not straightforward. There is a reason that conventional plastics are so widespread, as they combine low cost, heat stability, mechanical strength, processability, and compatibility – features that any alternative plastic replacements must match or surpass. 

Challenge overcome
Now, these features have been matched. Scientists led by Professor Jeremy Luterbacher at EPFL’s School of Basic Sciences have successfully developed a biomass-derived plastic similar to PET that meets the criteria for replacing several current plastics while being more environmentally friendly.

“We essentially just ‘cook’ wood or other non-edible plant material, such as agricultural wastes, in inexpensive chemicals to produce the plastic precursor in one step,” says Luterbacher. “By keeping the sugar structure intact within the molecular structure of the plastic, the chemistry is much simpler than current alternatives.”The scientists “cook” wood or other non-edible plant material, such as agricultural wastes, in inexpensive chemicals to produce the plastic precursor in a single step.

The technique is based on a discovery that Luterbacher and his colleagues published in 2016, where adding an aldehyde could stabilize certain fractions of plant material and avoid their destruction during extraction. By repurposing this chemistry, the researchers were able to rebuild a new useful bio-based chemical as a plastic precursor.

“By using a different aldehyde – glyoxylic acid instead of formaldehyde – we could simply clip ‘sticky’ groups onto both sides of the sugar molecules, which then allows them to act as plastic building blocks,” says Lorenz Manker, the study’s first author.

“With this simple technique, we are able to convert up to 25% of the weight of agricultural waste, or 95% of purified sugar, into plastic.”

Well-rounded properties
The well-rounded properties of these plastics could allow them to be used in applications ranging from packaging and textiles to medicine and electronics. The researchers have already made packaging films, fibers that could be spun into clothing or other textiles, and filaments for 3D printing.

“The plastic has very exciting properties, notably for applications like food packaging,” says Luterbacher. “And what makes the plastic unique is the presence of the intact sugar structure. This [structure] makes it incredibly easy to make because you don’t have to modify what nature gives you, and simple to degrade because it can go back to a molecule that is already abundant in nature.”

Edited by Joshua Poole