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Electrospinning polyelectrolyte complexes: pH-responsive fibers.

Mor Boas1, Arkadiusz Gradys, Gleb Vasilyev

  • 1Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa, 32000, Israel. morboas@tx.technion.ac.il.

Soft Matter
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Summary
This summary is machine-generated.

Electrospun polyelectrolyte fibers exhibit enhanced macromolecular alignment and tunable interactions. This allows for pH-controlled swelling, crucial for applications in tissue engineering and artificial muscles.

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • Electrospinning offers a method for creating polymer fibers with controlled morphology.
  • Polyelectrolytes are polymers with charged groups, enabling unique interactions and properties.

Purpose of the Study:

  • To fabricate and characterize electrospun fibers from oppositely charged polyelectrolytes for confined macromolecular packaging.
  • To investigate the impact of molecular alignment and intermolecular interactions on fiber properties and pH-responsive behavior.

Main Methods:

  • Fibers were electrospun from a mixture of poly(allylamine hydrochloride) and poly(acrylic acid) in an ethanol-water solvent.
  • Differential scanning calorimetry (DSC) and Fourier-transform infrared spectroscopy (FTIR) were used for thermal and chemical analysis.
  • Polarized FTIR and temperature-dependent FTIR were employed to study molecular orientation and interactions.

Main Results:

  • Electrospun fibers showed no glass transition (Tg) and an amidation process at lower temperatures than cast films.
  • Polarized FTIR indicated functional groups oriented perpendicular to the fiber axis, suggesting mixed-phase fibers with enhanced intermolecular interactions.
  • Fibers exhibited pH-dependent reversible swelling, with significant water diffusion (500%) and diameter increase (400%) due to ionic to hydrogen bonding transitions.

Conclusions:

  • The study demonstrates the formation of highly aligned, mixed-phase polyelectrolyte fibers with tunable intermolecular interactions.
  • pH-driven swelling behavior can be precisely controlled by manipulating ionic and hydrogen bonding interactions.
  • These tailored fiber properties hold promise for advanced applications in tissue engineering, membranes, and artificial muscles.