纳米纤维素制备及壳聚糖/NCC复合膜的性能研究

Preparation of nano-cellulose and performance of chitosan/NCC composite film

为了探究包装废弃物瓦楞纸板的回收再利用价值,以杨木浆板为对照,采用包装废弃物瓦楞纸板进行纳米纤维素（NCC）的制备,并以不同比例的NCC和壳聚糖复合成膜,比较研究了NCC含量对壳聚糖/NCC复合膜的膜性能的影响。废弃瓦楞纸板制备NCC的得率为53.87%,NCC形态为纺锤形,长度和直径范围分别为54～87nm和3～5nm,与杨木浆板NCC的形态相同,但长度较短。随纳米纤维素含量的增加,复合膜的抗拉强度及伸长率均有所提高,透湿量先增加后减少;透光率没有明显变化,均达99.8%以上。以瓦楞纸板NCC制备的壳聚糖/NCC复合膜的抗拉强度和伸长率略低于以杨木浆板NCC的复合膜。研究结果表明：废弃瓦楞纸板可作为NCC制备的来源,用于壳聚糖/NCC复合膜的制备并改善成膜性能。

The preparation and characterization of nano-cellulose（NCC）made with waste-corrugated cardboard and Poplar pulp board and yield of two different fiber source were studied in order to determine the possibility and value of waste corrugated cardboard reusing.The results showed that yield of NCC prepared from waste corrugated cardboard was53.87% and the morphology was spindle with length of 54～87nm and diameter of 3～5nm,which was similar as NCC prepared from poplar pulp board except in length.The performance of chitosan/NCC composite film was studied with nanocellulose at different dosage.With increasing content of the nano-cellulose,the tensile strength and elongation of the composite film increased,while water vapor permeability first increased and then decreased.No obvious variation of transmittance was found,both reached more than 99.8%.The tensile strength and elongation of composite film with NCC prepared from corrugated cardboard were slightly lower than that prepared from Poplar pulp.Waste packaging corrugated cardboard could be used as a cheap source of nano-cellulose and to made and improve the composite film with chitosan.