Chemical Recycling of Biodegradable Polymers
Summary
Chemical recycling of biodegradable polymers offers a route to recover monomers and valuable chemicals from end-of-life bioplastics, reinforcing a circular economy for renewable materials. Unlike mechanical recycling, which suffers from polymer degradation and limited reuse cycles, chemical approaches break down polyester-based materials such as poly(lactic acid) (PLA), polyhydroxyalkanoates (PHAs) and poly(butylene adipate-co-terephthalate) (PBAT) into their constituent building blocks. Key depolymerisation strategies include hydrolysis, alcoholysis and glycolysis, each employing water, alcohols or glycols respectively to cleave ester bonds under catalytic conditions. Alcoholysis yields alkyl lactates that can serve as green solvents or re-polymerised monomers; glycolysis produces diol-terminated oligomers for polyurethane or resin synthesis; and hydrolysis recovers pure lactic acid or related monomers. Emerging catalyst systems range from zinc-based complexes to ionic liquids, designed to operate at mild temperatures and pressures. By preserving polymer value and reducing greenhouse-gas emissions over incineration or landfilling, chemical recycling underpins practical applications in packaging, textiles and additive manufacturing, while addressing global plastic pollution and resource depletion.
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Chemical Recycling of Biodegradable Polymers publication trend
The graph below shows the total number of articles in chemical recycling of biodegradable polymers across all publications each year (not limited to Nature Index journals).
Technical terms
Biodegradable polymer: A polymer capable of breaking down into natural compounds under environmental or enzymatic conditions.
Depolymerisation: The chemical process by which polymer chains are cleaved into monomers or oligomers.
Alcoholysis: A depolymerisation reaction employing alcohol to cleave ester linkages, producing alkyl esters.
Glycolysis: Chemical recycling method using glycols to depolymerise polyesters into diol-terminated oligomers.
Monomer recovery: Process of regenerating original monomer units from polymer waste for fresh polymer synthesis.
References
- Synergistic Dual Catalytic System and Kinetics for the Alcoholysis of Poly(Lactic Acid). Processes (2021).
- Solvent-Assisted Poly(lactic acid) Upcycling under Mild Conditions. ACS Sustainable Chemistry & Engineering (2023).
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