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<p>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&#xa0;mol%, 32&#xa0;mol%, and 48&#xa0;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.</p>

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Cloud point thermodynamics and phase behavior of EVOH–DMSO systems for selective polymer recycling

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月8日

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  • Harrish Kumar Senthil Kumar,
  • Madelyn Torrance,
  • Daniel A. Meadows,
  • Jason Constance,
  • Aiden Stephens,
  • Adam L. Bachmann,
  • Virginia A. Davis,
  • Bryan S. Beckingham

摘要

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.