甲壳素纳米纤维增强明胶/壳聚糖复合膜的制备及性能研究

Preparation and Properties of Gelatin/Chitosan Composite Films Enhanced by Chitin Nanofiber

通过流延成膜法制备了不同甲壳素纳米纤维(CF)质量分数的CF/明胶(GA)/壳聚糖(CS)复合膜。利用透射电子显微镜(TEM)、扫描电子显微镜(FE-SEM)、紫外-可见光谱(UV-Vis)等对材料的结构与性质进行了研究。结果表明:低加入量CF在复合膜中分散较好,高加入量CF在复合膜中会形成团聚,CF与GA/CS之间有相对较好的相容性;随着CF含量增加,复合膜拉伸强度呈现先增加而后减小的趋势,而断裂伸长率则随着CF含量增加而持续降低;同时复合膜的水蒸气吸附率和水溶失率都随着CF含量的上升而降低。CF/GA/CS纳米复合膜表现出良好的透明性,较少CF的加入对材料透明度影响不大。

Nanocomposite films were prepared by the solution casting method by introducing chitin nanofiber（CF）into gelatin（GA）/chitosan（CS）matrix.Several methods were used to characterize the prepared films including FE-SEM,TEM and UV-Vis.SEM images showed that CF could be well dispersed in GA/CS matrix at low loading,while higher CF loadings resulted in the aggregation of particles in the nanocomposites.The addition of CF caused remarkable increase in tensile strength（TS）,which leads to improved tensile properties compared with the neat GA/CS film,but decreased elongation at break.In addition,water-resistance of films were enhanced by the CF.Furthermore,the introduction of CF barely affected light transmittance of the obtained nanocomposite films in the range of visible light regions.