I D
× COMMENTARYCOVER STORYIN THE NEWSNEWSFRONTSCHEMENTATOR + Show More BUSINESS NEWSTECHNICAL & PRACTICALFEATURE REPORTFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILEEQUIPMENT & SERVICESFOCUSNEW PRODUCTS + Show More

Comment

Poly-diketoenamines could allow closed-loop plastics recycling

By Scott Jenkins |

Conventional plastics are difficult to recycle because end-of-life processing generally is either energy-intensive or alters the physical properties of the materials. A team of researchers from the Lawrence Berkeley National Laboratory (Berkeley, Calif.; www.lbl.gov) and the University of California at Berkeley (www.berkeley.edu) is developing polymers that can be de-polymerized using acids at ambient temperatures. Known as poly-diketoenamines (PDKs), the materials are made through condensation reactions between ß-triketones and amines, and could allow plastics that can be re-manufactured inexpensively and without a loss of performance. PDKs are prepared by reacting ß-triketones with either aliphatic or aromatic amines to form dynamic covalent diketoenamine bonds. “The reaction between triketones and amines is spontaneous at ambient temperature,” says LBNL research leader Brett Helms, “but can also be conducted in a ball-mill, in the melt, or in solution. It requires no additional chemicals or catalysts,” he says. The resulting polymers can be depolymerized by treating with strong aqueous acids (either H2SO4 or HCl) at ambient temperature to yield triketone and amine monomers at greater than 90% yields. Helms says PDKs…
Related Content

Andritz

Minimizing particle breakage and mother liquor residue in technical salts production

Technical salts and crystallization products have found a broad spectrum of different applications in the industrial sector in the past decades. One of the most frequently used salts is sodium chloride...

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
The Big 6 level measurement technologies: Where to use them and why
Minimizing particle breakage and mother liquor residue in technical salts production
Expectations are shifting: How measurement solutions can help overcome chemical industry challenges
CoriolisMaster: The SmartSensor solution
ABB in Chemical Industry

View More