Cyclic Perfluoropolyether: Distinct Film Formability and Thermostabilization Upon Recyclable Cyclic-Linear...

Area of Science:

• Polymer Chemistry
• Materials Science
• Fluoropolymer Research

Background:

• Perfluoropolyethers (PFPEs) are valuable industrial fluoropolymers known for flexibility, noncombustibility, and chemical robustness.
• A key limitation for chemically modified PFPEs is their immiscibility with non-fluorinated molecules, hindering broader applications.
• Developing homogeneous PFPE systems is crucial for advancing their use in diverse industrial settings.

Purpose of the Study:

• To synthesize cyclic perfluoropolyethers (PFPEs) incorporating hexaarylbiimidazoles (HABIs) for improved miscibility.
• To investigate the topological transformation between linear and cyclic PFPE structures.
• To explore the fabrication of thermostabilized transparent films using these novel PFPE materials.

Main Methods:

• Synthesis of cyclic PFPEs by incorporating HABIs into linear PFPE chains with lophine end groups.
• Characterization of miscibility and film formation in the newly synthesized cyclic PFPEs.
• Investigating the reversible topological transformation between cyclic and linear PFPE states via thermal treatment.

Main Results:

• Achieved miscibility between HABIs and PFPE main chains in cyclic structures, forming transparent glass films.
• Demonstrated phase separation in linear PFPEs, contrasting with the homogeneous nature of the cyclic counterparts.
• Successfully induced cyclic-to-linear topological transformation upon mild heating by converting HABIs to lophines.

Conclusions:

• The design of cyclic PFPEs with HABIs overcomes the immiscibility challenge, leading to homogeneous and transparent materials.
• The reversible topological transformation capability allows for the fabrication of advanced, thermostabilized transparent PFPE films.
• This work opens new avenues for developing functional and processable PFPE-based materials for industrial applications.