防霉聚乙烯醇改性薄膜的制备及性能

目的研究以聚乙烯醇(PVA)为基材,通过柠檬酸(CA)改性制备出具有防霉效果的改性PVA薄膜。方法通过调整加热时间、加热温度及搅拌转速等参数,发现制备改性PVA母液规律性,并经溶液流延法加工制备出酸性防霉PVA改性薄膜,通过光学、力学性能研究其物理性能,通过半干鱼保鲜实验研究其防霉效果。结果得到的酸性防霉PVA改性薄膜均具有良好的光学及力学性能,在半干鱼实验中相对于对照组,实验组均体现了良好的防霉效果,其中含有质量分数为2%的柠檬酸的改性PVA薄膜防霉效果最佳。结论 PVA改性薄膜在其制备过程中具有一定规律性,得到的酸性PVA改性薄膜具有良好的防霉效果。

Preparation and Properties of Modified Polyvinyl Alcohol Films

This work was aimed to prepare modified polyvinyl alcohol (PVA) films with antifungal effects by adding citric acid (CA) to PVA. By adjusting the heating time, heating temperature, stirring speed and other parameters, the regularity of the preparation of the modified PVA colloid was found. And the acidic antifungal modified PVA films were prepared by flow-casting method. The physical properties were studied using the optical and mechanical parameters, and the antifungal effects were studied using the preservation experiment of semi-dried fish. The acidic antifungal modified PVA films obtained all had good optical and mechanical properties. For the antifungal effects in preservation of semi-dried fish during storage period, the modified PVA films all showed better antifungal effects than the control group, among which the antifungal capacity of the films modified with 2% CA was the best. The modified CA-PVA films had certain regularity in its preparation process and showed good antifungal effects in packaging semi-dried fish.