Chemically Recyclable, High Molar Mass Polyoxazolidinones via Ring-Opening Metathesis Polymerization

Area of Science:

• Polymer Chemistry
• Materials Science
• Organic Synthesis

Background:

• Developing chemically recyclable polymers with tunable properties is crucial for next-generation materials.
• Polyoxazolidinones (POxa) offer high polarity and thermal stability but face limitations in synthesis and recycling.

Purpose of the Study:

• To develop a robust synthesis for high molar mass polyoxazolidinones (POxa).
• To establish facile chemical recycling methods for POxa to their monomeric units.
• To explore the tunable properties of these novel polymers.

Main Methods:

• Ring-opening metathesis polymerization (ROMP) of oxazolidinone-fused cyclooctenes.
• Characterization of polymer thermal stability and glass transition temperatures.
• Demonstration of chemical recycling and repolymerization.

Main Results:

• Achieved synthesis of high molar mass POxa via ROMP.
• Polymers exhibited high thermal stability (mass loss <5% at 382-411 °C).
• Tunable glass transition temperatures (14-48 °C) were achieved by controlling side chain structure.
• Facile chemical recycling to monomer and subsequent repolymerization was demonstrated.

Conclusions:

• This study presents the first chain-growth synthesis of POxa, overcoming limitations of previous methods.
• The developed method provides a versatile platform for POxa synthesis and application.
• Facile recyclability and tunable properties position POxa as a promising class of polyurethanes.