A new flame-retardant plastic made from green tea can repair its own cracks when you shine a light on it.
April 24, 2026
Original Paper
High‑performance fully bio‑based polyimine vitrimers from epigallocatechin gallate: flame retardancy, photothermal self‑healing, antioxidant activity, water resistance, and dielectric properties
SSRN · 6628514
The Takeaway
Most plastics are made from petroleum and will melt or burn when exposed to high heat. This fully bio-based material is derived from polyphenols found in tea leaves and naturally resists catching fire. If the plastic gets scratched or broken, it can heal itself in minutes when exposed to near-infrared light. The light triggers the chemical bonds to rearrange and fuse back together without losing strength. This creates a sustainable material that lasts longer and reduces the need for constant replacements.
From the abstract
Development of sustainable thermosets that combine high performance, multifunctionality, and end-of-life recyclability remains a major challenge. Herein, a series of fully bio-based polyimine (PI) networks (ESF-x) is reported, derived from epigallocatechin gallate (EGCG), a naturally abundant polyphenol, and a bio-based dialdehyde (SF). EGCG was first functionalized into an aromatic multi-amine monomer (EGCG-4NH2), which was subsequently cured with SF to form dynamic imine networks. The resultin