Using titanium teraisopropoxide (TTIP) as the hydrolysis material, titanium dioxide (TiO₂) (6.3–11.1 nm) nanoparticles were synthesized via the sol-gel method and reinforced into poly lactic acid (PLA)/TiO₂ nanocomposite films by casting. The effect of increasing amounts of TiO₂ on the structure and properties of PLA/TiO₂ nanocomposite films were evaluated. These results indicated that self-aggregation of TiO₂ nanoparticles in PLA films could be avoided via sol-gel and casting processes. The presence of TiO₂ significantly improved the tensile strength and thermal stability of films. The PLA/TiO₂ (0.6 wt%) film exhibited the highest photocatalytic activity efficiency under UV irradiation and displayed high antibacterial activities with optimal inhibition zones of Staphylococcus aureus, followed by Escherichia dispersibility of TiO₂ in films were responsible for those improvements. This study suggests that PLA/TiO₂ nanocomposite films could be a promising antimicrobial alternative material to conventional plastic packages.

使用四异丙醇钛（TTIP）作为水解材料，通过溶胶-凝胶法合成了二氧化钛（TiO ₂）（6.3-11.1 nm）纳米颗粒，并通过流延将其增强为聚乳酸（PLA）/ TiO ₂纳米复合膜。评估了TiO _2的添加量对PLA / TiO ₂纳米复合膜结构和性能的影响。这些结果表明，通过溶胶-凝胶和流延过程可以避免TiO ₂纳米粒子在PLA膜中的自聚集。TiO ₂的存在显着改善了薄膜的拉伸强度和热稳定性。PLA / TiO ₂（0.6 wt％）薄膜在紫外线照射下表现出最高的光催化活性效率，并表现出较高的抗菌活性和最佳的金黄色葡萄球菌抑制区，其次是薄膜中TiO ₂的大肠埃希氏菌可分散性。这项研究表明，PLA / TiO ₂纳米复合膜可能是常规塑料包装的有希望的抗菌替代材料。