单宁酸/氧化锌/聚乙烯醇复合膜的制备及其性能研究OA

Using polyvinyl alcohol(PVA)as the base material,tannic acid(TA)and zinc oxide nanoparticles(ZnO NPs)were introduced and dissolved in DMSO mixed aqueous solution.Then,TA/ZnO/PVA composite films were prepared by freeze-thaw.The morphology,mechanical properties,hydrophilicity,and UV protection properties of TA/ZnO/PVA composite films were analyzed using scanning electron microscopy,universal tensile testing machine,contact angle meter,and UV spectrophotometer.The results showed that TA/ZnO/PVA composite membrane had relative smooth surface,The maximum tensile stress is 1.41 MPa,with a maximum elongation at break of 670%,and a maximum contact angle of 29.9 degrees.The hydroxyl groups in the composite membrane enhance the mechanical properties and hydrophilicity of the composite material through intermolecular interactions such as hydrogen bonding.When the ratio of DMSO to water was 3 to 7,the UV protection performance of the composite film was the best,with almost zero UV transmittance.The addition of TA and ZnO NPs improved the UV protection performance of the material.The TA/ZnO/PVA composite membrane exhibits broad application prospects in the preparation of UV-resistant products and medical dressings due to its excellent mechanical properties,hydrophilicity,and UV protection performance.