An new high-barrier packaging films for meat preservation were obtained by depositing graphene oxide (GO) layer-by-layer (LbL) on poly(-lactic acid)(PLLA)-poly (butylene itaconate) (PBI) copolymers (PLBI) with chitosan (CS) as bonding layer in this study. The H NMR results revealed that PLBI copolymer was successful synthesized. The introduction of PBI reduced the and crystallization capacity of PLLA film, which made the copolymer films exhibit extremely high flexibility (up to 186.1% elongation at break). The film also exhibited high hydrophilicity, which was favorable for the effective attachment of CS. With CS as an intermediate layer, the FTIR and SEM results showed that the GO was evenly distributed onto the PLBI film surface due to the electrostatic interaction. The oxygen, water vapor and UV light barrier properties of PLBI/CS/(GO-CS) films were improved and increased with the GO-CS layers. The PLBI/CS/(GO-CS) films, with extremely low oxygen permeability coefficients about 0.4 × 10 cm m/m·h·Pa, delayed the increase in weight loss, hardness, pH, TVB-N, TBARS, and total viable counts of chilled meat during storage. It also decreased the discoloration, and loss of springness and cohesiveness of chilled meat caused by long-term refrigeration. The LbL films even showed better freshness-keeping effect than commercial PA/PE films due to its superior barrier and certain antibacterial properties, suggesting great potential application in fresh meat preservation.

中文翻译：

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逐层开发用于肉类包装的高阻隔聚(L-乳酸)/壳聚糖/氧化石墨烯柔性薄膜


通过在聚乳酸（PLLA）-聚衣康酸丁二醇酯（PBI）共聚物（PLBI）上逐层沉积氧化石墨烯（GO），获得了一种用于肉类保鲜的新型高阻隔包装薄膜。本研究中以壳聚糖（CS）作为粘合层。 1H NMR结果表明PLBI共聚物合成成功。 PBI的引入降低了PLLA薄膜的结晶能力，使得共聚物薄膜表现出极高的柔韧性（断裂伸长率高达186.1%）。该薄膜还表现出高亲水性，有利于CS的有效附着。以CS作为中间层，FTIR和SEM结果表明，由于静电相互作用，GO均匀分布在PLBI薄膜表面。 PLBI/CS/(GO-CS)薄膜的氧气、水蒸气和紫外线阻隔性能随着GO-CS层的增加而得到改善和增强。 PLBI/CS/(GO-CS)薄膜具有极低的透氧系数（约0.4×10cm m/m·h·Pa），延缓了失重、硬度、pH、TVB-N、TBARS和总量的增加。冷藏肉在储存期间的活菌数。还可减少因长期冷藏而引起的冰鲜肉变色、失去弹性和粘结性。由于其优异的阻隔性和一定的抗菌性能，LbL 薄膜甚至比商业 PA/PE 薄膜表现出更好的保鲜效果，这表明其在鲜肉保鲜方面具有巨大的应用潜力。