Active packaging techniques such as oxygen scavenging have gained much attention from consumers in the past few years. It would be of great advantage if metal-based scavengers were replaced with plant-based sustainable and biodegradable materials. In this work, plant-based natural rubber latex was explored as a potential oxygen-scavenging material in combination with polyvinyl alcohol (PVA) to fabricate potentially biodegradable films. PVA and NRL were taken in different ratios for film formation and analyzed for their physical, mechanical, thermal, and moisture barrier properties along with their biodegradability as well as oxygen scavenging capacity and rate. Apparently, the film with two parts of NRL exhibited the highest scavenging capacity with a rate of 1045 mL O₂ per g and 95 mL O₂ per g per day at 60 °C and 120 s of UV-C exposure time, respectively, and a water contact angle of 65.18°. Alternatively, the same film has the lowest tensile strength of 10.36 MPa and did not degrade even after 90 days. The addition of two parts of PVA yielded the highest tensile strength of 24.32 MPa and faster degradation in 60 days. A higher water transmission rate of 24.2 g per m² per day was seen in the film with equal parts of PVA and NRL. After oxidation, all the films showed a significant color change compared to the color before oxidation. The films turned light brown from pale yellow and had the highest total color change of 31.27. This change in color can be a visual indication of oxygen scavenging by NRL. These results suggest that the fabricated potentially biodegradable PVA and NRL composite films can effectively scavenge oxygen with good mechanical and barrier properties and can hence be used in food packaging.

中文翻译：

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用于活性包装的由 PVA/NRL 制成的紫外光驱动绿色除氧复合材料：金属除氧剂的替代品

除氧等活性包装技术在过去几年中引起了消费者的广泛关注。如果金属清除剂被植物基可持续和可生物降解材料取代，那将具有巨大的优势。在这项工作中，植物基天然橡胶乳胶被探索作为一种潜在的除氧材料，与聚乙烯醇（PVA）结合来制造潜在的可生物降解的薄膜。采用不同比例的 PVA 和 NRL 进行成膜，并分析其物理、机械、热和防潮性能以及生物降解性以及除氧能力和速率。显然，含有两部分 NRL 的薄膜表现出最高的清除能力，在 60 °C 和 120 s UV-C 曝光时间下，清除率分别为 1045 mL O ₂每克和 95 mL O ₂每克每天。水接触角为65.18°。另外，同一薄膜的拉伸强度最低为 10.36 MPa，即使在 90 天后也不会降解。添加两部分 PVA 的拉伸强度最高为 24.32 MPa，并且在 60 天内降解速度更快。在含有等量PVA和NRL的薄膜中观察到较高的水透过率，为每天24.2g/m ² 。氧化后，与氧化前的颜色相比，所有薄膜都显示出显着的颜色变化。薄膜从浅黄色变成浅棕色，总颜色变化最高为31.27。这种颜色的变化可以作为 NRL 清除氧气的视觉指示。这些结果表明，所制备的潜在可生物降解的 PVA 和 NRL 复合薄膜可以有效地清除氧气，具有良好的机械和阻隔性能，因此可用于食品包装。