Rosin-Modified Polyurethane\nElastomers with Room-Temperature\nSelf-Healing Ability, High Strength, and Recyclability Based on Oxime\nDynamic Bonds

Abstract

Rosin, with a rigid hydrogenated phenanthrene ring, is\na widely\navailable biomass, but its high-value utilization needs to be enhanced.\nInspired by sustainable development strategies, the design of polymer\nelastomers with a room-temperature self-healing capability has been\na hot focus topic. However, designing elastomers that combine the\nconflicting properties of high mechanical performance and room-temperature\nself-healing is a significant challenge. The hydrogenated phenanthrene\nring of rosin provides a superior solution to this problem. In this\nwork, the polyurethane elastomer (BPU-<i>X</i>% AP) based\non rosin-hydrogenated phenanthrene ring structure, dynamic oxime,\nand hydrogen bonding was reported. The BPU-<i>X</i>% AP\nexhibits high tensile strength (37.8 MPa), and good toughness (126.9\nMJ m^–3). Due to the rosin structure that promotes\nthe movement of the elastomer chain segments, the elastomers have\nfast room-temperature self-healing and recyclability. Benefiting from\ntheir excellent mechanical strength and self-healing properties, BPU-<i>X</i>% AP as adhesives exhibits a strong lap shear strength\nof 5.5 MPa, and they can be used as hot melt binders. Corresponding\nto the cycling of the elastomer, the adhesive strength of BPU-10%\nAP remains almost the same after three cycles of adhesion to the iron\nand aluminum plates. This work provides a viable approach for the\npreparation of high-performance biomodified polyurethanes.