Locally Controllable Laser Patterning Transfer of Thermoplastic Polyurethane Induced by Sustainable Bismuth Trioxide Substrate

Abstract In recent years, laser patterning technology has attracted much attention due to its high efficiency and environmental protection. However, the traditional laser patterning method requires the addition of laser-responsive substances to the polymer matrix. This overall filling not only wastes resources, but also affects the excellent performance of the polymer matrix itself. This study reveals the locally controllable laser patterning transfer of thermoplastic polyurethane (TPU) film via a sustainable approach. The laser beam was irradiated on the interface between the laser sensitive bismuth trioxide (Bi2O3) substrate and the transparent TPU film. The Bi2O3 substrate absorbed laser light and partially carbonized the TPU through thermal conduction. The controllable thermal energy generated by laser irradiation made the surface of the TPU film to produce a clear pattern in situ. Repeated experiments had further proved the sustainable use of this Bi2O3 substrate. In addition, laser current and scanning speed were also important parameters for controlling laser-induced carbonization. This research provides a positive reference for efficient, non-destructive, and repeatable laser-induced polymer patterns.