A robust platform for functional microgels via thiol-ene achemistry with reactive polyether-based nanoparticles.

Area of Science:

• Polymer Chemistry
• Materials Science
• Nanotechnology

Background:

• Developing versatile platforms for synthesizing functional microgels is crucial for advanced material applications.
• Existing methods may lack control over particle properties or functionalization.
• Bio-compatible materials are increasingly important for biomedical applications.

Purpose of the Study:

• To develop a novel, reactive platform for preparing functional microgels.
• To enable facile post-synthesis modification with diverse responsive groups.
• To create degradable hydrogel particles with controlled properties.

Main Methods:

• Utilized thiol-ene crosslinking of poly(allyl glycidyl ether) in miniemulsion droplets.
• Employed a bio-compatible polyethylene glycol (PEG) block copolymer for particle stabilization.
• Introduced reactive allyl units within the inner polymeric network and a PEG corona.
• Performed subsequent thiol-ene functionalization for introducing responsive groups.
• Incorporated cleavable ester groups into the crosslinker for degradability.

Main Results:

• Successfully synthesized colloidal gels with a PEG corona and a reactive inner network.
• Demonstrated the stability of allyl groups, allowing purification and storage.
• Achieved facile introduction of various pH- and chemically-responsive groups.
• Prepared microgel libraries with consistent size, surface functionality, and crosslinking density.
• Confirmed degradability of hydrogel particles at elevated pH and under physiological esterase conditions.

Conclusions:

• Developed a facile and versatile synthetic platform for functional microgels.
• The platform allows for controlled introduction of responsive functionalities and tunable degradability.
• These microgels offer significant potential for applications requiring tailored nanoparticle properties.