胶原/高分子量壳聚糖复合纤维的制备及其性能

为提高纯胶原纤维的强度，在相容性分析的基础上，采用高分子量壳聚糖与胶原进行共混，通过湿法纺丝技术制备不同壳聚糖含量的胶原/ 壳聚糖复合纤维，并借助扫描电子显微镜、X射线衍射仪、傅里叶变换红外光谱仪等对其结构和性能进行表征。结果表明：胶原与壳聚糖在一定范围内由于氢键作用具有良好的相容性；棒状胶原分子的有序排列和一定的自组装结构随复合纤维中壳聚糖的含量的变化而变化，随着壳聚糖含量的增加，胶原分子的有序排列程度降低；与纯胶原和壳聚糖纤维相比，复合纤维的结晶性降低，胶原纤维分子链间距离的衍射峰约在6.7°和7.5°之间出现偏移；当胶原与壳聚糖质量比为8：2时，二者相容性最好，复合纤维断裂强度与纯胶原纤维相比提高了31.3%。

Preparation and properties of collagen/high-molecular weight chitosan composite fibers

In order to improve the strength of pure collagen fibers, and based on the compatibility analysis, collagen/chitosan composite fibers with different chitosan contents were prepared byblending high-molecular weight chitosanand collagen, and wet spinning. The samples were characterized by scanning electron microscopy, X-ray diffraction, Foourier transform infrared spcetroscopy, et al. The results show thatgood compatibility exists between collagen and chitosan in a certain range because of thehydrogen bond interactions therebetween. In the composite fibers, the rod-like structure and certainself-assemble structure ofcollagen molecules change with the content of chitosan molecules. The ordered alignment degree ofcollagen molecules decreases with the increase of thechitosan content. Meanwhile thes,crystallinity of the composite fibers decreased, compared with the pure collagen to chitosan fibers. and the diffraction peaks of the distance between the colecular chains of collagen fibers are shifted between 6.7° and 7.5°. When the mass ratio of collagen andchitosan is 8：2,the tensile strength of the composite fibers is improved by 31.3%, compared with the pure collagen fibers while their compatibility is the best.