This inheritance of unknown and therefore unpredictable properties has prevented plastic from becoming what many consider the Holy Grail of recycling: a “circular” material whose original monomers can be recovered for reuse for as long as possible, or “upcycled” to make a new, higher quality product.
So, when a reusable shopping bag made with recycled plastic gets threadbare with wear and tear, it can’t be upcycled or even recycled to make a new product. And once the bag has reached its end of life, it’s either incinerated to make heat, electricity, or fuel, or ends up in a landfill, Helms said.
“Circular plastics and plastics upcycling are grand challenges,” he said. “We’ve already seen the impact of plastic waste leaking into our aquatic ecosystems, and this trend is likely to be exacerbated by the increasing amounts of plastics being manufactured and the downstream pressure it places on our municipal recycling infrastructure.”
Recycling plastic one monomer at a time
The researchers want to divert plastics from landfills and the oceans by incentivizing the recovery and reuse of plastics, which could be possible with polymers formed from PDKs. “With PDKs, the immutable bonds of conventional plastics are replaced with reversible bonds that allow the plastic to be recycled more effectively,” Helms said.
Unlike conventional plastics, the monomers of PDK plastic could be recovered and freed from any compounded additives simply by dunking the material in a highly acidic solution. The acid helps to break the bonds between the monomers and separate them from the chemical additives that give plastic its look and feel.
“We’re interested in the chemistry that redirects plastic lifecycles from linear to circular,” said Helms. “We see an opportunity to make a difference for where there are no recycling options.” That includes adhesives, phone cases, watch bands, shoes, computer cables, and hard thermosets that are created by molding hot plastic material.
The researchers first discovered the exciting circular property of PDK-based plastics when Christensen was applying various acids to glassware used to make PDK adhesives, and noticed that the adhesive’s composition had changed. Curious as to how the adhesive might have been transformed, Christensen analyzed the sample’s molecular structure with an NMR (nuclear magnetic resonance) spectroscopy instrument. “To our surprise, they were the original monomers,” Helms said.
After testing various formulations at the Molecular Foundry, they demonstrated that not only does acid break down PDK polymers into monomers, but the process also allows the monomers to be separated from entwined additives.
Next, they proved that the recovered PDK monomers can be remade into polymers, and those recycled polymers can form new plastic materials without inheriting the color or other features of the original material – so that broken black watchband you tossed in the trash could find new life as a computer keyboard if it’s made with PDK plastic. They could also upcycle the plastic by adding additional features, such as flexibility.
Moving toward a circular plastic future
The researchers believe that their new recyclable plastic could be a good alternative to many nonrecyclable plastics in use today.
“We’re at a critical point where we need to think about the infrastructure needed to modernize recycling facilities for future waste sorting and processing,” said Helms. “If these facilities were designed to recycle or upcycle PDK and related plastics, then we would be able to more effectively divert plastic from landfills and the oceans. This is an exciting time to start thinking about how to design both materials and recycling facilities to enable circular plastics,” said Helms.
The researchers next plan to develop PDK plastics with a wide range of thermal and mechanical properties for applications as diverse as textiles, 3D printing, and foams. In addition, they are looking to expand the formulations by incorporating plant-based materials and other sustainable sources.
The Molecular Foundry is a DOE Office of Science User Facility that specializes in nanoscale science.
This work was supported by the DOE’s Laboratory Directed Research and Development (LDRD) program with additional funding provided by the DOE Office of Science through the SULI program.
The technology is available for licensing and collaboration. If interested, please contact Berkeley Lab’s Intellectual Property Office, [email protected].
The Latest on: Next-generation plastic
via Google News
The Latest on: Next-generation plastic
- Scotland bans sale of plastic cotton buds in UK firston October 12, 2019 at 8:16 am
The Scottish parliament took the decision to ban plastic cotton buds back in September - a ban ... reuse and recycle to ensure a sustainable future for the current and next generation," she added. :: ...
- Scotland first part of UK to ban plastic cotton budson October 12, 2019 at 5:15 am
It follows an earlier outlawing of the sale and manufacture of plastic micro beads ... ensure a sustainable future for the current and next generation.’ Major retailers began switching to ...
- Scotland becomes first part of UK to ban sale of plastic cotton budson October 12, 2019 at 5:03 am
Ms Cunningham added: "We are facing a global climate emergency and must all work together to reduce, reuse and recycle to ensure a sustainable future for the current and next generation." Catherine ...
- Scotland Has Banned Plastic Cotton Buds – When Will The Rest Of The UK Do The Same?on October 12, 2019 at 4:43 am
Scotland's Environment Secretary Roseanna Cunningham added: "We are facing a global climate emergency and must all work together to reduce, reuse and recycle to ensure a sustainable future for the ...
- Scotland becomes first part of UK to ban plastic cotton budson October 12, 2019 at 4:00 am
Plastic straw, stirrers and cotton buds will be banned in England from April 2020 ... reuse and recycle to ensure a sustainable future for the current and next generation." WWF Scotland director Lang ...
- Scotland to ban plastic cotton buds as part of plan to cut single-use plasticson October 12, 2019 at 2:40 am
She added: "We are facing a global climate emergency and must all work together to reduce, reuse and recycle to ensure a sustainable future for the current and next generation." The Marine ...
- With New Absolute-Reduction Strategy, Unilever 'Gets Drastic on Plastic’on October 8, 2019 at 11:41 am
"Plastic has its place, but that place is not in the environment ... particularly as the youths that champion these issues enter the workforce and become the next generation of business leaders.” ...
- Unilever to cut plastic use by half by 2025on October 7, 2019 at 11:21 pm
Our plastic is our responsibility and so we are committed to ... particularly as the youths that champion these issues enter the workforce and become the next generation of business leaders. Greta ...
- Socionext Unveils New, Next-Generation Radar Sensors for IoT, Smart Home, and Other Applicationson October 3, 2019 at 12:46 am
Radar sensor works without camera for presence detection, thus offering anonymity. Additionally, it can operate behind non-metallic surfaces, walls or plastic housing and generate behavioral data such ...
- Plastic problemson October 2, 2019 at 11:51 am
The same Act also bans plastic bags that are less than 50 microns in thickness. The crux of the matter is that all such laws have been ineffective due to the sheer lack of enforcement. So the big ...
via Bing News