Olefin metathesis-based chemically recyclable polymers enabled by fused-ring monomers

Area of Science:

• Polymer Chemistry
• Materials Science
• Sustainable Chemistry

Background:

• Current plastics sustainability challenges necessitate the development of chemically recyclable polymers.
• Existing recyclable polymers often lack the thermal stability and mechanical strength of traditional plastics.

Purpose of the Study:

• To engineer novel, chemically recyclable polymers with enhanced thermal stability and tunable mechanical properties.
• To explore the potential of fused-ring monomers for creating next-generation sustainable materials.

Main Methods:

• Synthesis of polymers via ring-opening metathesis polymerization of cyclooctene derivatives.
• Incorporation of a trans-cyclobutane ring to modify monomer ring strain energy.
• Characterization of thermal stability (decomposition temperature >370°C) and mechanical properties.

Main Results:

• Developed chemically recyclable polymers exhibiting excellent thermal stability (>370°C).
• Demonstrated tunable mechanical properties, including access to elastomers and plastics.
• Reduced monomer ring strain energy from 8.2 kcal/mol to 4.9 kcal/mol through fused-ring design.

Conclusions:

• The fused-ring monomer design facilitates the creation of high-performance, chemically recyclable polymers.
• These materials show significant promise as sustainable alternatives to conventional plastics.
• The approach enables the incorporation of diverse functionalities for tailored material properties.