Light-Mediated Supramolecular Functionalization of Polymerization-Induced Self-Assembled Micelles

Area of Science:

• Polymer Chemistry
• Materials Science
• Nanotechnology

Background:

• Precise control over polymeric nanoparticles is crucial for advanced drug delivery.
• Polymerization-induced self-assembly (PISA) is a versatile method for creating block-copolymer micelles with tunable architectures.
• Light offers localized and tunable external control for triggering molecular processes within nanoparticles.

Purpose of the Study:

• To develop light-responsive polymeric micelles for controlled cargo loading and release.
• To functionalize micelles using light-mediated supramolecular interactions.
• To investigate the effect of photoswitch loading and light stimuli on cargo encapsulation and release.

Main Methods:

• Utilized polymerization-induced self-assembly (PISA) in water to synthesize block-copolymer micelles.
• Incorporated diacylaminopyridine units into micelles for light-mediated functionalization.
• Employed UV and visible light to control the loading and release of a model hydrophobic cargo (Nile Red) via photoswitches.

Main Results:

• Achieved light-mediated functionalization of micelles by converting thymine-based azo photoswitches to their cis form using UV light.
• Demonstrated that photoswitch loading enhances the encapsulation of hydrophobic cargo.
• Showcased accelerated cargo release upon subsequent UV irradiation and sustained release over days.

Conclusions:

• Developed dynamic polymeric micelles whose structure and cargo release are fully controllable by light.
• Successfully integrated reversible photochemistry with advanced polymerization techniques for sophisticated drug delivery systems.
• Established a robust platform for light-triggered drug delivery with tunable release kinetics.