High-strength UV-resistant polyvinyl alcohol composite films based on Phellodendron amurense Rupr extract

Environmentally friendly and biodegradable polyvinyl alcohol (PVOH) film combined with Phellodendron amurense extract was used to prepare an anti-UV composite film through thermal flow molding technology. The prepared PVOH composite film containing Phellodendron amurense extract exhibited UV-resistant properties, with the composite film made from leaf extract showing the highest UV resistance. Additionally, the tensile strength and toughness of the PVOH composite film with added Phellodendron amurense extract significantly increased compared to pure PVOH film. Studies on film-forming and UV-resistant mechanisms have revealed that extract particles can act as nucleating agents to promote the local ordered arrangement of PVOH molecular chains, forming microcrystalline regions. This enhances the tensile strength of composite films while maintaining their toughness. During the film-forming process, the extract forms hydrogen bonds with PVOH, and the benzene ring conjugated double bonds in the extract can absorb ultraviolet light, contributing to the UV resistance of the PVOH composite film. The composite film prepared from Phellodendron amurense extract and PVOH with UV resistance and high strength can be applied in fields such as packaging, food, and sunscreen products, which is of great significance for promoting the efficient development and utilization of biomass resources.