Resveratrol/epoxidized soybean oil bio-based non-isocyanate polyurethane: High strength, recyclability and adhesive applications

Advancing bio-based non-isocyanate polyurethanes (NIPUs) is vital for fostering sustainable development. This study, inspired by the concept of "rigid and flexible" successfully utilized resveratrol , epoxidized soybean oil, and carbon dioxide (CO 2 ) to produce a novel type of NIPUs (CRSOP) with outstanding mechanical properties, recyclability, and adhesive properties . Test results reveal that CRSOP demonstrates a tensile strength of 20.85 MPa and an elongation at break surpassing 160 %. The synthesized CRSOP shows excellent recyclability, with a recycling efficiency of over 80 % even after three cycles. Additionally, the rich polar groups in CRSOP contribute to its exceptional adhesion on diverse substrates such as copper (5.29 MPa), steel (7.48 MPa), aluminum (6.12 MPa), glass (4.71 MPa), and polytetrafluoroethylene (1.75 MPa). Even after prolonged immersion in organic solvents , CRSOP maintains a lap shear strength comparable to the initial value, demonstrating outstanding environmental tolerance. This paper showcases a superior-performing NIPUs derived from renewable resources and simultaneously expands its extensive application in the adhesive field.