Plastic made from Sugar and CO2

The new process converts sugar to plastic using carbon dioxide gas. Credit: Georgina Gregory

Some biodegradable plastics could in the future be made using sugar and carbon dioxide, replacing unsustainable plastics made from crude oil, following research by scientists from the Centre for Sustainable Chemical Technologies (CSCT) at the University of Bath. Polycarbonate is used to make drinks bottles, lenses for glasses and in scratch-resistant coatings for phones, CDs and DVDs.

Current manufacture processes for polycarbonate use BPA (banned from use in baby bottles) and highly toxic phosgene, used as a chemical weapon in World War One. Bath scientists have made alternative polycarbonates from sugars and carbon dioxide in a new process that also uses low pressures and room temperature, making it cheaper and safer to produce. This new type of polycarbonate can be biodegraded back into carbon dioxide and sugar using enzymes from soil bacteria. This new plastic is bio-compatible so could in the future be used for medical implants or as scaffolds for growing replacement organs for transplant.

The resulting plastic has similar physical properties to those derived from petrochemicals, being strong, transparent and scratch-resistant. The crucial difference is that they can be degraded back into carbon dioxide and sugar using the enzymes found in soil bacteria. “Our process uses carbon dioxide instead of the highly toxic chemical phosgene, and produces a plastic that is free from BPA, so not only is the plastic safer, but the manufacture process is cleaner too.” In particular, they used nature as inspiration for the process, using the sugar found in DNA called thymidine as a building block to make a novel polycarbonate plastic. PhD student Georgina Gregory, explained: “Thymidine is one of the units that makes up DNA. Because it is already present in the body, it means this plastic will be bio-compatible and can be used safely for tissue engineering applications.

“The properties of this new plastic can be fine-tuned by tweaking the chemical structure – eg. we can make the plastic positively charged so that cells can stick to it, making it useful as a scaffold for tissue engineering.” Such tissue engineering work has already started in collaboration with Dr Ram Sharma from Chemical Engineering, also part of the CSCT. The researchers have also looked at using other sugars such as ribose and mannose. Dr Buchard added: “Chemists have 100 years’ experience with using petrochemicals as a raw material so we need to start again using renewable feedstocks like sugars as a base for synthetic but sustainable materials. It’s early days, but the future looks promising.” http://www.bath.ac.uk/research/news/2017/06/12/scientists-make-plastic-from-sugar-and-carbon-dioxide