Fe^3+-单宁酸络合物涂层对胶原纤维膜性能的影响

Effect of Fe^3+-Tannic Acid Complex Coating on the Properties of Collagen Fiber Film

胶原纤维以其优异的机械性能和生物相容性等优点,在食品和材料等领域得到广泛应用。而金属离子-多酚络合物作为一种新兴的材料修饰方法近年来也开始受到研究人员的关注。其可以用于制备薄膜、微胶囊以及作为有机薄膜表面的涂层。该文利用Fe-单宁酸(tannic acid,TA)易于在固体表面粘附的原理把Fe3+-TA络合物作为涂层涂布于胶原纤维膜表面,探究其对胶原纤维膜性能的影响。傅里叶变换红外光谱(fourier transform infrared spectrometer,FTIR)结果表明,Fe3+-TA络合物与胶原纤维膜间有很强的氢键作用。随着涂层数的形成,薄膜表面变得粗糙,薄膜的阻光性能逐渐升高。此外,薄膜水接触角随涂层数的增加而减小,这表明涂层的形成增强薄膜的亲水性。然而,涂层的形成可能由于会造成胶原纤维膜网络结构的变化,导致薄膜的各项机械性能出现不同程度的下降。

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.