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Photoactivated Cyclic Polyphthalaldehyde Microcapsules for Payload Delivery.

Youngsu Shin1, Jared M Schwartz1, Anthony C Engler2

  • 1School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

ACS Applied Materials & Interfaces
|August 7, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed phototriggerable microcapsules using cyclic polyphthalaldehyde (cPPA) shells. These microcapsules enable on-demand release of oil payloads when exposed to UV light, offering a versatile controlled-release technology.

Keywords:
emulsificationmetastable polymermicrocapsulephotoacid generatorphototriggerablepolyphthalaldehydestimuli-responsivetransient polymer

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Microcapsules are essential for controlled release applications.
  • Developing stimuli-responsive materials is crucial for advanced delivery systems.
  • Phototriggerable depolymerization offers precise payload release mechanisms.

Purpose of the Study:

  • To fabricate and characterize phototriggerable microcapsules with cyclic polyphthalaldehyde (cPPA) shells for controlled payload release.
  • To investigate the effect of different photoacid generators (PAGs) on the release kinetics.
  • To evaluate the performance of copolymer shells for enhanced release rates.

Main Methods:

  • Fabrication of cPPA microcapsules via emulsification.
  • Incorporation of photoacid generators (PAGs) into the cPPA shell.
  • Photoactivation using UV radiation to induce depolymerization and payload release.
  • Quantification of core release using 1H NMR spectroscopy.
  • Synthesis and characterization of phthalaldehyde/propanal copolymer shells.

Main Results:

  • Uniform spherical microcapsules with cPPA shells were successfully fabricated.
  • Photoacid generators (BCSD and HNT) enabled phototriggerable depolymerization.
  • HNT-based microcapsules showed instantaneous core release upon UV irradiation.
  • UV exposure of cPPA/HNT microcapsules resulted in 66.5% core release.
  • Phthalaldehyde/propanal copolymer shells demonstrated faster release (82% in 30s).

Conclusions:

  • The developed phototriggerable cPPA microcapsules offer a versatile platform for on-demand release of hydrophobic payloads.
  • The choice of PAG significantly influences the release trigger and speed.
  • Copolymer shells provide enhanced release kinetics, expanding the application potential.
  • This technology holds promise for applications requiring precise and controlled delivery.