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Cher Hon Lau1, Phuc Tien Nguyen, Matthew R Hill

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Aging in super glassy polymers like PTMSP, PMP, and PIM-1 reduces gas separation membrane performance. An ultraporous additive prevents polymer chain packing, maintaining high CO2 permeability and selectivity for over a year.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Chemical Engineering

Background:

  • Super glassy polymers, including poly(trimethylsilylpropyne) (PTMSP), poly(4-methyl-2-pentyne) (PMP), and polymers with intrinsic microporosity (PIM-1), exhibit high initial gas permeability.
  • These polymers undergo physical aging, leading to densification, reduced porosity, and decreased permeability, limiting their use in gas separation membranes.
  • The aging process involves polymer chain packing, which diminishes the free volume and transport properties essential for efficient gas separation.

Purpose of the Study:

  • To overcome the detrimental effects of physical aging in super glassy polymers used for gas separation membranes.
  • To develop a strategy that maintains the initial high permeability and porosity of these polymers over extended periods.
  • To enhance the long-term performance of gas separation membranes based on super glassy polymers.

Main Methods:

  • Incorporation of an ultraporous additive into the matrix of super glassy polymers.
  • The additive functions by physically confining polymer chains within its porous structure.
  • Evaluation of gas permeability and selectivity (specifically CO2/N2) over time to assess the effect of the additive on aging.

Main Results:

  • The addition of an ultraporous material effectively inhibited the physical aging of super glassy polymers.
  • Enhanced CO2 permeability was maintained for at least one year.
  • An improvement in CO2/N2 selectivity was observed, alongside the inhibited aging and maintained permeability.

Conclusions:

  • The developed method successfully prevents polymer chain packing and densification in super glassy polymers.
  • This approach offers a viable solution to the long-standing challenge of physical aging in these materials.
  • Revisiting super glassy polymers for commercial gas separation applications is now feasible due to inhibited aging and sustained performance.