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Compostable and Recyclable Baroplastic Triblock Copolymers Enable Low-Energy Polymer Processing
Summary
Scientists created a new type of plastic that can be molded at room temperature using pressure instead of high heat, meaning it can even be used to package heat-sensitive materials like proteins or medicines without damaging them. Unlike conventional plastics, this material breaks down completely in industrial composting within about two months and can also be recycled, so it doesn't stick around as microplastic pollution that can end up in our food, water, and bodies. This matters because microplastics are increasingly linked to health concerns, so plastics designed to fully disappear or be reused, rather than fragment into forever-lingering particles, could reduce our long-term exposure
Baroplastic polymers enable low-energy processing at low temperatures under mild pressure preserving polymer integrity and supporting end-of-life pathways that reduce the formation of persistent microplastic residues. Poly(L-lactide)-block-poly(ethylene glycol)-block-poly(L-lactide) (PLLA-b-PEG-b-PLLA) triblock copolymers demonstrate baroplasticity, enabling ambient temperature processing under moderate pressure. Here, we synthesized and characterized PLLA-b-PEG-b-PLLA with specific block lengths, showing rapid degradation within 2 months under industrial composting conditions and effective chemical and physical recyclability. Low-temperature baroplastic processing preserves the activity of encapsulated heat-sensitive proteins, expanding its application potential. These findings suggest that PLLA-b-PEG-b-PLLA combines sustainable processing, compostability, and recyclability, offering a promising platform for environmentally friendly polymer technologies in packaging, agriculture, and beyond.