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N‑Substituted Fluorinated Polybenzimidazoles: An Easy Post-Modification Strategy for Improved CO2 Separation.

C Aguilar-Lugo1,2, M Rojas-Rodriguez1, A E Lozano3

  • 1Instituto de Investigaciones en Materiales. Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán, 04510, Ciudad de México, México.

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Summary

New N-substituted aromatic polybenzimidazoles (N-PBIs) show improved solubility and CO2/CH4 gas separation but have lower thermal stability. These findings offer insights into polymer design for membrane applications.

Keywords:
CO2 SeparationFluorinated PBIGas Separation MembraneN-Substituted PBIsPolybenzimidazolePost-Polymerization ModificationTertiary Amine GroupsThermal Decomposition

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Polybenzimidazoles (PBIs) are high-performance polymers with limited processability.
  • Fluorinated PBIs (PBI-6F) offer a base for modifications.

Purpose of the Study:

  • Synthesize and characterize N-substituted aromatic polybenzimidazoles (N-PBIs).
  • Evaluate their processability, gas separation performance, and thermal stability.

Main Methods:

  • Post-polymerization modification of PBI-6F with aliphatic amine-containing chains.
  • Solubility testing in various organic solvents.
  • Gas separation membrane performance evaluation (CO2/CH4).
  • Thermal decomposition analysis and computational studies.

Main Results:

  • N-PBIs exhibited enhanced solubility in common solvents like chloroform and THF.
  • Amine-functionalized N-PBIs (PBI-DMEA, PBI-DMPA) showed improved CO2/CH4 permselectivity.
  • Increased CO2 solubility parameter contributed to enhanced gas separation.
  • Aliphatic amine presence led to significantly reduced decomposition temperatures.

Conclusions:

  • N-substitution enhances PBI processability and CO2/CH4 separation.
  • Balancing solubility and thermal stability is crucial for amine-functionalized PBIs.
  • Computational analysis confirmed experimental observations on decomposition and transport properties.