单宁紫外吸收特性及其在PVA薄膜中的应用

Study on the UV-Absorption Characteristics of Tannins and Its Application in PVA Thin Film

采用紫外可见分光光度计对单宁酸、橡椀单宁和黑荆树单宁等进行定性扫描,探讨了不同种类单宁的紫外吸收特性,并考察了不同种类单宁的混和物的紫外吸收特性。将单宁添加到聚乙烯醇树脂中制成薄膜,探讨了单宁的种类和添加量对聚乙烯醇薄膜的紫外吸收特性的影响。结果表明:聚乙烯醇薄膜的紫外吸收特性不仅与单宁的种类有关,还与单宁的添加量有关。随着聚乙烯醇薄膜中单宁含量的增加,其对紫外吸收的效果越好。

Tannic acid,valonia tannin and black wattle tannin were scanned by the UV - Vis spectrophotometer. The UV - absorption characteristics of the different tannins and the mixtures of the different tannins were investigated in this paper. Polyvinyl alcohol films were prepared by spin - coater. Effects of the types and contents of tannins on the UV - absorption characteristics of pelyvinyl alcohol films were discussed. The results showed that the UV -absorption characteristics of polyvinyl alcohol films depended on both the contents of tannins and the types of tannins. With the contents of tannins in the polyvinyl alcohol films increasing, the UV - absorption characteristics of the polyvinyl alcohol films improved.