Diselenide-Containing Polymeric Vesicles with Osmotic Pressure Response

Area of Science:

• Polymer Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Mechanophores are functional groups that react to mechanical stimuli.
• Diselenide bonds are dynamic covalent bonds responsive to external stimuli.
• Self-assembled polymer vesicles offer potential for controlled release applications.

Purpose of the Study:

• To investigate the use of osmotic pressure as a mechanical force to trigger diselenide exchange reactions.
• To synthesize and characterize a diselenide-containing block polymer capable of self-assembly into vesicles.
• To explore the potential of osmotic pressure-responsive diselenide bonds in controlled release systems.

Main Methods:

• Synthesis of a diselenide bond-containing block polymer and an ester bond-containing counterpart.
• Self-assembly of the block polymer into vesicle structures.
• Application of osmotic pressure using NaCl to induce vesicle rupture and trigger chemical reactions.

Main Results:

• Diselenide-containing vesicles ruptured upon exposure to osmotic pressure, while ester bond counterparts remained intact.
• Evidence of diselenide exchange reaction confirmed through chemical composition analysis.
• The study demonstrates a distinct mechanical response of diselenide bonds to osmotic pressure.

Conclusions:

• Osmotic pressure can effectively trigger diselenide exchange reactions in polymer vesicles.
• This finding expands the scope of diselenide dynamic covalent chemistry.
• The developed system shows promise for applications in controlled release technologies.