Polymers from Plant Oils Linked by Siloxane Bonds for Programmed Depolymerization

Area of Science:

• Polymer Chemistry
• Materials Science
• Green Chemistry

Background:

• Growing plastic waste and reliance on fossil fuels necessitate sustainable alternatives.
• Development of polymers from renewable resources is crucial for environmental protection.
• Controlled depolymerization and repolymerization are key to achieving polymer circularity.

Purpose of the Study:

• To synthesize novel polymers from renewable feedstocks using siloxane linkages.
• To investigate the controlled depolymerization and repolymerization of these polymers.
• To evaluate the environmental degradation and microbial metabolism of the developed polymers.

Main Methods:

• Synthesis of siloxane-containing α,ω-diesters and α,ω-diols from castor oil-derived alkenoic esters.
• Polymerization with biobased monomers and ring-opening polymerization of macrolactones.
• Programmed depolymerization in protic solvents or with acid catalysis.
• Enzymatic degradation assays and ¹³C-labeled monomer metabolism studies.

Main Results:

• Successfully synthesized and polymerized siloxane-containing monomers and copolymers.
• Achieved controlled depolymerization into monomers, enabling repolymerization and demonstrating circularity.
• Demonstrated enzymatic hydrolysis by a fungal cutinase and differential microbial metabolism of polymer components.

Conclusions:

• The developed siloxane-containing polymers offer a promising route to sustainable and circular plastics.
• These materials exhibit controlled degradation pathways, addressing plastic waste accumulation.
• The study highlights the potential of biobased feedstocks and innovative polymer design for a circular economy.