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CO2 - and O2 -sensitive fluorophenyl end-capped poly(ethylene glycol).

Jung Yoon Choi1, Jin Young Kim, Hyo Jung Moon

  • 1Department of Chemistry and Nano Science, Ewha Global Top 5 Research Program, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 120-750, Korea.

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Summary

This study shows that pentafluorophenyl end-capped poly(ethylene glycol) (PF-PEG-PF) solutions exhibit a tunable lower critical solution temperature (LCST) responsive to dissolved gases like oxygen and carbon dioxide.

Keywords:
fluoropolymeroxygen-sensitivestimuli-sensitive

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Area of Science:

  • Polymer Science
  • Materials Chemistry
  • Physical Chemistry

Background:

  • Poly(ethylene glycol) (PEG) derivatives are widely explored for stimuli-responsive applications.
  • Controlling phase transitions in polymers is crucial for advanced material design.
  • Gas-responsive materials offer unique opportunities for sensing and actuation.

Purpose of the Study:

  • To investigate the gas-responsive behavior of pentafluorophenyl end-capped poly(ethylene glycol) (PF-PEG-PF) aqueous solutions.
  • To determine the influence of dissolved gases (CO2 and O2) on the lower critical solution temperature (LCST).
  • To elucidate the underlying mechanisms governing the gas-induced phase transitions.

Main Methods:

  • Preparation and characterization of PF-PEG-PF polymers.
  • Measurement of LCST in aqueous solutions under different dissolved gas conditions.
  • Spectroscopic analysis using (19)F NMR and (1)H NMR to probe molecular interactions.

Main Results:

  • PF-PEG-PF aqueous solutions exhibit a lower critical solution temperature (LCST).
  • The LCST is sensitive to the type of dissolved gas, increasing from 24.5 °C for CO2 to 26 °C for O2.
  • Reversible transparent-to-turbid transitions were observed upon gas exchange (CO2/O2) at 24.5 °C.
  • (19)F and (1)H NMR data indicate PEG dehydration and altered intermolecular interactions are responsible for LCST changes.

Conclusions:

  • The LCST of PF-PEG-PF is tunable by the type of dissolved gas, offering a novel stimuli-responsive system.
  • Gas-induced changes in polymer hydration and intermolecular forces drive the observed phase transitions.
  • This work provides insights for designing gas-controlled stimuli-responsive polymers.