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Control of Nanostructured Polysulfone Membrane Preparation by Phase Inversion Method.

Cristina Bărdacă Urducea1, Aurelia Cristina Nechifor1, Ioana Alina Dimulescu1

  • 1Analytical Chemistry and Environmental Engineering Department, University Politehnica of Bucharest, 011061 Bucharest, Romania.

Nanomaterials (Basel, Switzerland)
|December 1, 2020
PubMed
Summary

Investigating polymer film exposure time during phase inversion membrane preparation reveals its critical impact on nanostructure. Optimizing this contact time enhances membrane performance for filtration applications.

Keywords:
electrochemical monitorizationimmersion–precipitation techniquephase inversionphase inversion parameterspolysulfone membrane

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Polymer Science

Background:

  • Phase inversion, specifically immersion-precipitation, is a versatile method for creating polymeric membrane nanostructures.
  • The technique classically involves polymer solution preparation, film casting, immersion in a coagulation bath, and conditioning.
  • All stages of phase inversion are crucial for membrane nanostructure, with decades of research focused on optimization.

Purpose of the Study:

  • To explore the influence of polymer film's environmental contact time before immersion on membrane nanostructure.
  • To correlate membrane characteristics and performance with this critical pre-immersion exposure time.

Main Methods:

  • Utilized an electrochemical technique to monitor polymer film behavior during environmental exposure.
  • Prepared polysulfone-dimethylformamide-aqueous ethanol (PSf-DMF-EW) membranes.
  • Characterized membranes using scanning electron microscopy (SEM), thermal analysis (TA), water permeation, and bovine serum albumin (BSA) retention.

Main Results:

  • Demonstrated a correlation between the environmental contact time of the polymer film and the resulting membrane's morphology, structure, and performance.
  • Electrochemical parameters provided insights into the effects of exposure time on membrane formation.
  • Optimized exposure time led to enhanced water permeation and BSA retention.

Conclusions:

  • The pre-immersion environmental contact time is a significant factor in phase inversion membrane preparation.
  • Electrochemical monitoring offers a valuable tool for understanding and controlling this parameter.
  • Controlling exposure time allows for tailored nanostructure and improved membrane performance.