4.6 Article

Theoretically Self-Consistent Nonequilibrium Thermodynamics of Glassy Polymer Theory for the Solubility of Vapors and Liquids in Glassy Polymers

Journal

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 60, Issue 36, Pages 13377-13387

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.1c02194

Keywords

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Funding

  1. ExxonMobil Research and Engineering
  2. U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) under the Advanced Manufacturing Office [DE-EE0007888]

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The study introduces a modified approach to self-consistently calculate the glassy polymer density of a solvent swollen polymer, which has profound implications on both theoretical and practical aspects. This is achieved through a new perturbation theory, validating the new approach against sorption data in several glassy polymers.
The nonequilibrium thermodynamics of glassy polymer (NETGP) theory provides a formalism to calculate solubilities of volatile species in glassy polymers using equilibrium free energies. The classic NETGP approach of Sarti and Doghieri assumes that the glassy polymer density of a solvent swollen polymer is known a priori. In the modified approach developed in this work, this density is calculated self-consistently. The self-consistent calculation of the swollen polymer density has profound implications on both the theoretical and practical aspects of the theory. This is accomplished by means of a new class of perturbation theory, which assumes that the sorption of volatile species in a glassy polymer can be treated as a perturbation to a dry polymer reference state. The new approach is then validated against sorption data in several glassy polymers.

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