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Updated: Jul 10, 2026

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
Published on: December 16, 2022
Cloud point thermodynamics and phase behavior of EVOH-DMSO systems for selective polymer recycling
Harrish Kumar Senthil Kumar1, Madelyn Torrance1, Daniel A Meadows1
1Department of Chemical Engineering, Auburn University, 212 Ross Hall, Auburn, AL, 36849, USA.
None:
Understanding phase behavior of polymer-solvent mixtures is crucial for applications ranging from plastic recycling to crude oil extraction from reservoirs. One method for investigating polymer-solvent solution behavior is through understanding the cloud point thermodynamics. In this study, the cloud points of three different grades of ethylene vinyl alcohol (EVOH) copolymers (27 mol%, 32 mol%, and 48 mol% ethylene content) are characterized in dimethyl sulfoxide solutions for two conditions: isobaric-non-isothermal and isothermal-non-isobaric. Notably, increasing ethylene content in the EVOH copolymer shifts the cloud point to higher temperatures and pressures. Additionally, cloud points for EVOH in DMSO/Water (solvent-antisolvent) mixtures were characterized to optimize solvent use and polymer recovery. The combined cloud point data is used to construct a working phase diagram, delineating an EVOH grade-based separation zone, defining a boundary between homogenous and phase separated regions. These results contribute to our understanding of EVOH solution phase behavior and are critical for optimizing solvent requirements for selective polymer recycling technologies, enhancing dissolution efficiency, and sustainability in polymer processing. Furthermore, insights into the phase separation behavior of EVOH support more efficient separation strategies in multilayer packaging systems, enabling targeted extraction of EVOH from complex waste streams and facilitating high-purity recovery for reuse.
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