In this study, Paraloid B‐72 (poly methyl methacrlylate/ethylacrylate 70:30) and its nanocomposites with titanium dioxide (TiO₂) concentration 1–5% have been prepared by emulsion polymerization technique and characterized by transmission electron microscope (TEM), Fourier‐transform infrared spectroscopy (FT‐IR) in addition to antimicrobial activity against Aspergillus niger and Penicillium sp. The prepared Paraloid B‐72 and its titanium dioxide nanocomposites was grafted onto polylactic acid (PLA) and the results indicate that the grafting percentage reached to maximum value using the nanocomposite of Paraloid B‐72 with 3% TiO₂. PLA grafted with Paraloid B‐72/3% TiO₂ has been characterized by scanning electron microscope (SEM), FT‐IR as well as mechanical and color change measurements. The results show that incorporation of Paraloid B‐72 / TiO₂ improved the properties of PLA. The produced PLA grafted Paraloid B‐72 and its 5% titanium dioxide have been used for coating strawberry to enhance and control the cold storage at 4°C for 15 days.

中文翻译：

---

B-72 / TiO2纳米复合物的制备，表征及其对草莓涂层剂聚乳酸性能的影响

在这项研究中，通过乳液聚合技术制备了Paraloid B-72（聚甲基丙烯酸甲酯/丙烯酸乙酯70:30）及其二氧化钛（TiO ₂）浓度为1-5％的纳米复合材料，并通过透射电子显微镜（TEM）进行了表征，傅里叶变换红外光谱（FT-IR）以及对黑曲霉和青霉菌的抗菌活性。将制备的Paraloid B-72及其二氧化钛纳米复合材料接枝到聚乳酸（PLA）上，结果表明，使用3％TiO ₂的Paraloid B-72纳米复合材料，接枝率达到最大值。PLA接枝了Paraloid B‐72 / 3％TiO ₂通过扫描电子显微镜（SEM），FT-IR以及机械和颜色变化测量来表征。结果表明，结合抛物面B-72 / TiO _2可改善PLA的性能。生产的PLA接枝的Paraloid B-72及其5％二氧化钛已用于草莓涂层，以增强和控制4°C下的冷藏15天。