Abstract:Collagen fibers are widely used in the fields of food and materials due to their excellent mechanical properties and biocompatibility.As an emerging material modification method，metal ion-polyphenol complexes have also begun to attract the researchers′attention in recent years，which could be used as coatings for films，microcapsules，and organic thin film.In this article，based on the principle that Fe3+-TA is easy to adhere to the surface of the solid，the Fe3+-tannic（tannic acid，TA）complex was used as a coating on the surface of collagen fiber films and its influence on the films was estimated.Fourier transform infrared spectroscopy（FTIR）results indicated that there was hydrogen bonding between Fe3+-TA complex coating and collagen fiber film.And with the coating formation，the surface of the film became rougher and the light barrier performance of the film increased.In addition，the water contact angle was decreased with the number of coating increased，which indicated that the formation of the coating enhanced the hydrophilicity of the film.However，the formation of the coating was accompanied by the reorganization of the collagen fibers in the film，which resulted the mechanical properties of the film to decrease to varying degrees.