纳米纤维素/壳聚糖复合膜的制备和性能

目的获得力学性能和阻隔性能优异的食品包装用壳聚糖膜。方法通过超声法由糠醛渣纤维素制备纳米纤维素(NCC),将其与壳聚糖(CS)共混流延制备纳米纤维素/壳聚糖复合膜(NCC-CS)。结果复合膜中NCC质量分数为5%时,NCC-CS的拉伸强度比纯CS膜提高了30%,NCC-CS的透湿量比纯CS膜降低了24%。SEM分析结果表明NCC-CS复合膜微观结构致密。FT-IR和XRD的分析结果表明CS与NCC间存在着较强的相互作用。结论 NCC的加入对CS膜的力学性能和阻隔性能的提高有促进作用。

Preparation and Properties of Nanocrystalline Cellulose/Chitosan Composite Films

The work aims to obtain chitosan films for food packaging with excellent mechanical and barrier properties. Nanocrystalline cellulose (NCC) was prepared with corncob acid hydrolysis residue cellulose by ultrasonication. The nanocrystalline cellulose/chitosan composite films (NCC-CS) made of NCC and chitosan (CS) were prepared by solution casting. The tensile strength of NCC-CS composite films with 5% (w/w) NCC content was improved by 30% compared to the pure CS films, and the water vapor permeability of NCC-CS composite films was decreased by 24%. SEM of NCC-CS composite films obtained under the optimal formulation analysis results proved that the microstructure was dense. FT-IR and XRD analysis results proved that the interaction between NCC and CS was strong. In conclusion, NCC plays an important role in improving the mechanical and barrier properties of CS films.