Issue 11, 2023

Large-scale computational polymer solubility predictions and applications to dissolution-based plastic recycling

Abstract

Dissolution-based plastic recycling is a promising approach to separate and recover high quality pure polymer resins from multicomponent plastic waste by exploiting differences in polymer solubility. The design of a dissolution-based polymer recycling process requires the selection of appropriate solvent systems and operating temperatures to dissolve only target polymers. Determining these parameters experimentally is challenging due to the wide range of solvents and temperatures possible for a given set of target polymers. In this work, we report a computational scheme that employs molecular dynamics simulations and the Conductor-like Screening Model for Realistic Solvents to predict polymer solubilities. Using this scheme, we established a computational solubility database for 8 common polymers and 1007 solvents at multiple temperatures and measured selected solubilities experimentally to validate computational predictions. Analysis of functional groups within this large database then provides chemical heuristics relating the molecular structures of good and non-solvents for selected polymers. We further developed a tool that automates the selection of solvents for all possible sequences in which target polymers can be selectively dissolved to guide the design of dissolution-based plastic recycling processes. We demonstrate the application of these methods via multiple experimental case studies of representative dissolution-based polymer recycling processes in which pure polymer resins were successfully recovered from physical mixtures of polymers.

Graphical abstract: Large-scale computational polymer solubility predictions and applications to dissolution-based plastic recycling

Supplementary files

Article information

Article type
Paper
Submitted
03 Febr. 2023
Accepted
04 Maijs 2023
First published
09 Maijs 2023

Green Chem., 2023,25, 4402-4414

Author version available

Large-scale computational polymer solubility predictions and applications to dissolution-based plastic recycling

P. Zhou, J. Yu, K. L. Sánchez-Rivera, G. W. Huber and R. C. Van Lehn, Green Chem., 2023, 25, 4402 DOI: 10.1039/D3GC00404J

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