Design of a Chitinase-Responsive, Depolymerizable Petroleum-Derived Polymer for Circular and Antifouling Materials

Area of Science:

• Polymer Chemistry
• Biotechnology
• Environmental Science

Background:

• Petroleum-derived polymers (PDPs) offer desirable properties but persist environmentally due to inert backbones.
• Developing polymers with tunable end-of-life properties is crucial for sustainability.

Purpose of the Study:

• To design and synthesize a novel polymer, PHEVD, that retains PDP-like performance while enabling environmentally benign degradation.
• To investigate the biodegradation mechanism and products of PHEVD.

Main Methods:

• Synthesis of PHEVD (poly-[7-(2-hydroxyethyl)-2,4-divinyl-3-oxa-7-azabi-cyclo[3.3.0]-octane-6,8-dione]).
• Comparative analysis of thermal stability and film performance against PET and PE.
• Biodegradation studies using *Pseudomonas aeruginosa* (PAO1) and *Chlorella vulgaris*.
• Transcriptomic, mutant, and purified-enzyme analyses to identify degradation pathways.
• Chemical characterization using 1H NMR and LC-MS to confirm depolymerization products.

Main Results:

• PHEVD exhibits comparable thermal robustness and hydrophobic film performance to conventional PDPs.
• PHEVD undergoes rapid and near-complete depolymerization within 7 days under mild aqueous conditions with PAO1.
• Degradation is linked to Chitinase-associated pathways, yielding soluble low-molecular-weight products, not microplastics.
• Degradation products show correlation with biofilm-dispersion signatures.

Conclusions:

• PHEVD represents a structure-guided approach to sustainable polymer design, balancing performance with controlled biodegradability.
• This polymer offers a viable alternative to persistent PDPs, reducing environmental accumulation.
• The findings open avenues for designing functional polymers with triggered end-of-life degradation.