Abstract Defects in metal oxide (MO)-coated polymer films increase their oxygen and water vapor transmission rates (OTRs, WVTRs), lowering the shelf-life of packaged food. In this study, we investigated the effects of thermal processing on six multilayered MO-coated films: MO-A (MO-coated PET(12 μm)//Oriented-Nylon 6 (15 μm)//Cast-Polypropylene (50 μm)), MO-B (SiOx-coated PET(12 μm)//Oriented-Nylon 6 (15 μm)//Cast-Polypropylene (60 μm)), MO-C (Overlayer/AlOx-organic-coated PET(13 μm)//Oriented-Nylon 6 (15 μm)//Cast-Polypropylene (50 μm)), MO-D (Overlayer/SiOx-coated PET(12 μm)//Oriented-Nylon 6 (15 μm)//Cast-Polypropylene (60 μm)), MO-E (AlOx-coated PET(12 μm)//AlOx-coated PET(12 μm)//Oriented-Nylon 6 (15 μm)//Cast-Polypropylene (70 μm)) and MO-F (AlOx-coated PET(12 μm)//AlOx-coated PET(12 μm)//AlOx-coated PET(12 μm)//Oriented-Nylon 6 (15 μm)//Cast-Polypropylene (70 μm)). Water filled film pouches were processed with a pilot-scale retort (30 and 40 min at 121 °C; F0 = 6–9 min) and microwave-assisted thermal sterilization unit (25-kW, single-mode, 915 MHz MATS system; F0 = 10.9 min). Subsequently, the pouches were emptied, filled with a color-changing oxygen sensor and stored at 23 ± 2 °C for 180-days. MO-F with three AlOx-coated PET layers, showed no oxygen permeation before and after retort and MATS processes. Compared to other films, MO-F exhibited low WVTRs after processing. Oxygen sensor in MO-F changed color at limited locations, indicating fewer defects. Confocal laser scanning microscope and scanning electron microscope images also showed less deterioration in MO-F. The dielectric loss factor (er") for MO-F was significantly less than other films (P

中文翻译：

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用于包装内热灭菌食品的超高阻隔金属氧化物涂层聚合物薄膜的功能

摘要 金属氧化物 (MO) 涂层聚合物薄膜的缺陷会增加其氧气和水蒸气透过率 (OTRs, WVTRs)，从而降低包装食品的保质期。在这项研究中，我们研究了热处理对六层多层 MO 涂层薄膜的影响：MO-A（MO 涂层 PET（12 微米）//定向尼龙 6（15 微米）//浇铸聚丙烯（50 微米） ), MO-B (SiOx-coated PET(12 μm)//Oriented-Nylon 6 (15 μm)//Cast-Polyacryl (60 μm)), MO-C (Overlayer/AlOx-organic-coated PET(13 μm) )//Oriented-Nylon 6 (15 μm)//Cast-Polyacryl (50 μm)), MO-D (Overlayer/SiOx-coated PET(12 μm)//Oriented-Nylon 6 (15 μm)//Cast-聚丙烯 (60 μm))、MO-E（AlOx 涂层 PET（12 μm）//AlOx 涂层 PET（12 μm）//定向尼龙 6（15 μm）//浇铸聚丙烯（70 μm））和 MO-F（AlOx 涂层） PET(12 μm)//AlOx 涂层 PET(12 μm)//AlOx 涂层 PET(12 μm)//取向尼龙 6 (15 μm)//浇铸聚丙烯 (70 μm)）。充水薄膜袋用中试规模的蒸馏器（121°C 下 30 和 40 分钟；F0 = 6-9 分钟）和微波辅助热灭菌装置（25 千瓦，单模，915 MHz MATS 系统； F0 = 10.9 分钟）。随后，将袋子清空，装入变色氧传感器并在 23±2°C 下储存 180 天。MO-F 具有三层 AlOx 涂层 PET 层，在蒸煮和 MATS 工艺前后均未显示氧气渗透。与其他薄膜相比，MO-F 在加工后表现出较低的 WVTR。MO-F 中的氧传感器在有限的位置改变颜色，表明缺陷较少。共聚焦激光扫描显微镜和扫描电子显微镜图像也显示 MO-F 的劣化较少。MO-F 的介电损耗因子 (er") 明显低于其他薄膜 (P