Modeling Chain Scission Mechanisms for Predictive Plastic Degradation

• Sarah N. Carson, Applied Mathematics, University of Delaware

• Alex H. Balzer, Department of Chemical and Biomolecular Engineering, University of Delaware
• LaShanda T.J. Korley, Department of Chemical and Biomolecular Engineering, University of Delaware

Low plastic recycling rates and the mismanagement of plastic waste have led to the majority of plastic directed towards landfills causing negative environmental impacts. An emerging solution to these issues is advanced chemical recycling, which breaks polymers down to their monomer or other high value small molecule. However, there is a limited understanding of the mechanisms involved in the intermediate steps of this process. To address this challenge, we developed an analytical modeling approach to polymer recycling. These models account for various potential scission pathways, including random, chain-end, and central scission. Additionally, polymer feedstock molecular weight distributions and deconstruction rates are varied. Through this modeling, we were able to identify unique characteristics about polymer chain scission mechanisms used in polymer deconstruction. By providing this additional insight into deconstruction mechanisms that are difficult to experimentally determine, we aim to support the development of more efficient chemical recycling strategies and guide future experimental efforts.