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Photo-Triggered Charge Control Induces Dissociation of Complex Coacervates.

Rei Kakitani1, Tomoya Nishimura1, Thi Ngan Vu1

  • 1Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji 671-2280, Japan.

Polymers
|March 28, 2026
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Summary

Researchers developed a light-responsive polymer that changes charge. This polymer can control electrostatic interactions, leading to the light-induced disappearance of coacervates, offering new material design possibilities.

Keywords:
coacervatesdissociation behaviorelectrostatic interactionsphoto-responsive polymerspolyampholytes

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Polyampholytes possess both positive and negative charges.
  • Controlling interpolymer electrostatic interactions is crucial for designing responsive materials.

Purpose of the Study:

  • To design a photo-responsive polyampholyte with tunable charge properties.
  • To investigate the light-induced dissociation of coacervates formed with this polyampholyte.

Main Methods:

  • Synthesis of a photo-responsive polyampholyte using reversible addition-fragmentation chain transfer (RAFT) polymerization.
  • Incorporation of quaternary ammonium (cationic) and phosphate (anionic) groups, along with photo-cleavable o-nitrobenzyl groups.
  • Characterization of polyampholyte properties and coacervate behavior using zeta potential measurements and visual observation.

Main Results:

  • A cationic polyampholyte was synthesized, exhibiting a decrease in zeta potential upon photoirradiation due to increased anionic charge.
  • Coacervate droplets formed between the cationic polyampholyte and anionic poly(2-acrylamido-2-methylpropanesulfonate) (PAMPS).
  • Photoirradiation induced the dissociation of these coacervates by weakening electrostatic interactions.

Conclusions:

  • The study demonstrates a method to control interpolymer electrostatic interactions using light.
  • The developed photo-responsive polyampholyte provides a platform for light-triggered material disassembly.
  • This research offers design guidelines for light-responsive polymeric systems and coacervate disassembly.