醋酸纤维素/壳聚糖复合膜制备与性能优化

为拓展醋酸纤维素(CA)在可降解包装材料中的应用,采用溶液共混法制备了醋酸纤维素(CA)和壳聚糖(CS)复合膜,研究了CS含量对CA/CS二元复合膜性能的影响。通过观察并分析复合膜的形貌、断面结构、化学键发现,CS能够充分结合膜内外的孔隙结构,两者之间强烈的相互作用增强了复合膜的各项性能。性能测试结果表明,当CS含量为10%时,复合膜的力学性能达到最大,断裂伸长率及抗拉强度分别增加12.37%和38.62 MPa,降解损失率提高了50.14%。同时,抑制了大肠杆菌及金黄色葡萄球菌的生长,抗菌率最高能够达到73.9%和54.6%。因此,CS在提高CA膜的力学性能和降解性能的同时,还赋予了复合膜优异的抗菌性。

Preparation and Performance Optimization of Cellulose Acetate/Chitosan Composite Membranes

In order to expand the application of cellulose acetate(CA)in degradable packaging materials,cellulose acetate(CA)and chitosan(CS)composite membranes were prepared by solution blending method.The effects of CS content on the properties of CA/CS binary composite membranes were discussed.By observing and analyzing the morphology,crosssection structure and chemical bond of the composite film,the experimental results showed that CS could fully combine the pore structure inside and outside the film,and the strong interaction between CS and CS enhanced the properties of the composite film.The mechanical properties of the composite film reached the maximum when the CS content was 10%.The elongation at break and tensile strength increased by 12.37%and 38.62 MPa,respectively,and the degradation loss rate increased by 50.14%.At the same time,the growth of Escherichia coli and Staphylococcus aureus was inhibited.The highest antimicrobial rates were 73.9%and 54.6%.CS not only improved the mechanical properties and degradation properties of CA membrane,but also endowed the composite membrane with excellent antimicrobial properties.