Extrudable Vitrimeric Elastomer Enabled by Interfacial Stress Amplification of Multiphase Network

• • Gel ratio exceeds 95%, ensuring a highly crosslinked network that maintains structural integrity while enabling reprocessing, a critical threshold for load-bearing rubber applications. • • Interfacial stress amplification accelerates dynamic covalent bond exchange, reducing reprocessing time and energy consumption compared to conventional vitrimers. • • Coarse-grained molecular dynamics simulations quantify local stress evolution, showing that stress concentration at multiphase interfaces lowers the activation energy for bond exchange by up to 30%. • • The extrudable vitrimeric elastomer achieves a tensile strength of 12 MPa and elongation at break of 400%, matching commercial thermoset rubbers while offering reprocessability.