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Synthesizing Hypercrosslinked Polymers with Deep Eutectic Solvents to Enhance CO2/N2 Selectivity.

Liang Ding1, Nadhita Chanchaona1, Kristina Konstas2

  • 1School of Engineering, The University of Edinburgh, Kings Building, Edinburgh, EH93FB, United Kingdom.

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|February 1, 2024
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Summary

Researchers developed a greener method for synthesizing hypercrosslinked polymers (HCPs) using deep eutectic solvents (DES) instead of hazardous halogenated solvents. This novel approach enhances CO2/N2 selectivity in materials for gas separation.

Keywords:
CO2/N2 selectivityDeep Eutectic SolventsHypercrosslinked Polymers

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Green Chemistry

Background:

  • Hypercrosslinked polymers (HCPs) are vital for applications like ion exchange and gas separation.
  • Traditional HCP synthesis relies on toxic halogenated solvents, posing environmental and health risks.

Purpose of the Study:

  • To investigate the feasibility of replacing hazardous halogenated solvents with deep eutectic solvents (DES) in HCP synthesis.
  • To explore the efficacy of DES as both solvent and catalyst in Friedel Crafts alkylation for polymer crosslinking.

Main Methods:

  • Synthesized HCPs using two distinct DES formulations: [ChCl][ZnCl2]2 and [ChCl][FeCl3]2.
  • Employed both internal and external crosslinking strategies.
  • Characterized the synthesized HCPs, focusing on surface area, pore size distribution, and gas selectivity.

Main Results:

  • HCPs synthesized in DES exhibited 20-60% lower specific surface areas compared to those made with halogenated solvents.
  • CO2/N2 selectivities were significantly enhanced, reaching up to 453% higher values.
  • The poly-α,α'-dichloro-p-xylene synthesized in [ChCl][ZnCl2]2 via internal crosslinking achieved a CO2/N2 selectivity of 105.

Conclusions:

  • Deep eutectic solvents provide a viable, greener alternative to halogenated solvents for HCP synthesis.
  • HCPs synthesized in DES possess narrower pore size distributions, leading to improved gas separation performance, particularly for CO2/N2 selectivity.