Functional and Degradable Polyester-co-polyethers from CO₂, Butadiene, and Epoxides

Area of Science:

• Polymer Chemistry
• Sustainable Materials Science
• Catalysis

Background:

• Carbon dioxide (CO2) is a renewable, non-toxic C1 feedstock for sustainable polymer synthesis.
• Ring-opening copolymerization of CO2 and epoxides typically yields aliphatic polycarbonates.
• There is a need for novel CO2-based polymers with enhanced functionality and degradability.

Purpose of the Study:

• To develop an unprecedented strategy for synthesizing functional and degradable polyester-co-polyethers.
• To utilize carbon dioxide (CO2), butadiene, and epoxides as monomers.
• To explore the catalytic copolymerization of a novel intermediate derived from CO2 and butadiene.

Main Methods:

• Synthesis of a CO2/butadiene-derived δ-valerolactone intermediate (EVP).
• Catalytic ring-opening copolymerization of EVP and epoxides using a chromium salen complex.
• Characterization of the resulting CO2/butadiene/epoxide terpolymers.

Main Results:

• Successfully produced polyester-co-polyethers with varying EVP content (39-93 mol %, 18-28 wt % CO2 incorporation).
• The terpolymers exhibit high thermal stability and tunable glass-transition temperatures.
• Achieved on-demand functionality and good chemical degradability in the synthesized polymers.

Conclusions:

• This method provides a novel route to access functional and degradable CO2-based polymers.
• The synthesized polyester-co-polyethers offer a promising platform for sustainable material development.
• The strategy expands the scope of utilizing CO2 as a comonomer in polymer synthesis.