壳聚糖/4-羟基苯甲醛基复合膜制备工艺条件优化

Optimization of Preparation Conditions of Chitosan/4-Hydroxybenzaldehyde Composite Film

此研究将以乙酸作溶剂的壳聚糖溶液,乙醇作溶剂的4-羟基苯甲醛溶液混合制备复合膜。以单因素试验结合正交试验,以拉伸强度为考察指标,探究壳聚糖和4-羟基苯甲醛制成膜的优化工艺,并对按优化工艺制备得到的复合膜进行扫描电镜分析和水接触角测定。结果显示,加入4-羟基苯甲醛后,复合膜其力学性能有明显改善,在壳聚糖和4-羟基苯甲醛添加量分别为1.25 g和150 g,烘烤温度为45℃时,膜的拉伸强度达到极大值,即0.0265 MPa。按优化工艺条件制备的复合膜表面光滑平整,具有较好的疏水性,能满足其作为食品包装膜的应用。

In this study,the composite film was prepared by mixing chitosan solution with acetic acid and 4-hydroxybenzaldehyde solution with ethanol.The optimum process of film made of chitosan and 4-hydroxybenzaldehyde was investigated by single factor test combined with orthogonal test with tensile strength as the index.The composite film prepared by optimized process was analyzed by SEM and measured by water contact Angle.The results showed that the mechanical properties of the composite film were significantly improved after the addition of 4-hydroxybenzaldehyde.When the addition amount of chitosan and 4-hydroxybenzaldehyde was 1.25 g and 1.50 g,respectively,and the baking temperature was 45℃,the tensile strength of the composite film reached the maximum value,in which the surface of the composite film prepared by optimizing the process conditions of 0.0265 MPa was smooth and smooth,and had good hydrophobicity.It could meet its application as a food packaging film.