Flow Photochemistry for Single-Chain Polymer Nanoparticle Synthesis.

Area of Science:

• Polymer Chemistry
• Materials Science
• Nanotechnology

Background:

• Single chain polymer nanoparticles (SCNPs) mimic functional biomacromolecules but their synthesis requires high dilution, limiting production.
• Existing methods for SCNS generation necessitate large reactors and specific chemical conditions, posing scalability challenges.

Purpose of the Study:

• To develop a more efficient and controlled method for synthesizing single chain polymer nanoparticles (SCNPs).
• To investigate the application of flow photochemistry for the intramolecular folding of macromolecules into SCNPs.

Main Methods:

• Utilized photochemical cross-linking of anthracene units in polymethylmethacrylate (100 kDa) via UV irradiation (366 nm).
• Compared batch and continuous flow photochemical processes for SCNS formation.
• Controlled irradiation time in flow chemistry by adjusting flow rates for precise intramolecular collapse.

Main Results:

• Achieved SCNS formation in both batch and flow photochemical setups.
• Flow chemistry demonstrated a four-fold increase in efficiency compared to batch processing.
• Flow system reached higher intramolecular cross-linking ratios five times faster than batch operation.

Conclusions:

• Flow photochemistry offers a significantly more efficient and faster route for SCNS synthesis.
• The ability to precisely control irradiation time via flow rates enhances control over the intramolecular folding process.
• This method overcomes limitations of traditional high-dilution techniques, enabling scalable production of SCNPs.