Fluorine-Containing Triblock Copolymer Vesicles with Microphase-Separated Structure

Area of Science:

• Polymer Chemistry
• Materials Science
• Nanotechnology

Background:

• Incorporating fluorine into block copolymers effectively tunes nanoassembly structures.
• Observing nanoscale microphase-separated structures in block copolymers is challenging.
• Fluorinated polymers offer unique properties for advanced materials.

Purpose of the Study:

• To synthesize fluorine-containing ABC triblock copolymer vesicles.
• To characterize the nanoassembly structure of these novel vesicles.
• To investigate the role of the fluorine-containing block in microdomain formation.

Main Methods:

• Synthesis of poly(ethylene glycol)-block-polystyrene-block-poly(4-vinylbenzyl pentafluorophenyl ether) (PEG-b-PS-b-PVBFP) via RAFT polymerization.
• Characterization of vesicle size and membrane thickness.
• Analysis of microdomain formation within the vesicular membrane.

Main Results:

• Successfully synthesized PEG45-b-PS197-b-PVBFP233 triblock copolymer vesicles.
• Vesicles exhibited a large size (~216 nm) and thin membrane (~28 nm).
• The fluorine-containing PVBFP block formed distinct 9 nm columnar microdomains within the membrane, shielded by the PS phase.

Conclusions:

• Fluorine-containing block copolymers can form well-defined, large-sized vesicles.
• The study elucidates the self-assembly behavior of fluorine-containing triblock copolymers at the nanoscale.
• The observed columnar microdomains provide a pathway for designing functional nanomaterials.