目的 在 LLDPE / CS 共混膜表面缩合对羟基苯甲醛,制备表面席夫碱基 LLDPE / CS 功能包装膜。 方法 采用 L₉(3³) 正交实验探讨反应时间、反应温度及反应物浓度对 LLDPE / CS 包装膜表面的壳聚糖席夫碱基含量的影响。 结果 达到表面基团最大含量的最佳反应条件为 45 ℃ ,对羟基苯甲醛溶液的质量分数为 25% ,反应时间为 12 h。 对大肠杆菌、金黄色葡萄球菌和黑曲霉的抑菌实验表明,对羟基苯甲醛席夫碱基 LLDPE / CS 共混包装膜具有抑菌性所需要的最低基团含量分别是 0 . 1 ,0 . 2 ,0 . 3 mmol / cm²,且随着表面席夫碱基团含量增加而增加。 结论 FTIR 和¹H NMR 分析结果表明,表面基团具有席夫碱的结构特征。

Objective Schiff base LLDPE / CS functional packaging films were prepared by a condensation reaction of p hydroxybenzaldehyde and chitosan ( CS) . Methods The optimal conditions of LLDPE / CS films modification were obtained according to [ L₉(3³) ] . Results The optimal conditions were as follows: a reaction temperature of 45 ℃ , a p-hydroxybenzaldehyde concentration of 25% and a reaction time of 12 h. The study on antibacterial activities against Escherichia coli, Staphlococcus aureus and Aspergillus niger indicated that the lowest antibacterial concentrations of schiff base were 0. 1 mmol / cm²,0. 2 mmol / cm²and 0. 3 mmol / cm², respectively, and the antibacterial activities were improved with the increasing contents of schiff base groups on the surface. Conclusion FTIR and¹H NMR showed that there were schiff base groups on the films.