Abstract Cellulose is considered as an alternative for the demand of biocompatible and environmentally friendly food packaging. The aim of this study was to evaluate a composite film from regenerated cellulose combined with polyvinyl alcohol. Glycerol was used as a plasticizer. Mathematical models were used to describe the effect of the film structure on the mechanical (tensile strength, percentage of elongation at break) and barrier properties (water vapour permeability, light-barrier properties and transparency). The morphology, structural and thermal properties were evaluated by spectral analysis (FT-IR and UV-VIS-NIR), scanning electron microscopy and differential scanning calorimetry. Models predict cellulose-glycerol-polyvinyl alcohol films with tensile strength values from 25.9 to 369 MPa, similar to that of synthetic polymer films. The elongation at break of the developed films (0.89–18.7%) was lower than that of synthetic polymer films. The water vapour permeability obtained (2.32·10−11 - 3.01·10−11 g/s·m·Pa) was higher than that of petrochemical-based plastics. Cellulose films reinforced with polyvinyl alcohol showed a smooth surface. Results showed that it is viable to accomplish composite films from cellulose-polyvinyl alcohol-glycerol with enhanced mechanical properties. The obtained films showed top values of transparency. The addition of glycerol resulted in films with a UV protective effect which could be important in food packaging to prevent lipid oxidative deterioration.

中文翻译：

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由再生纤维素-甘油-聚乙烯醇制成的新型复合薄膜：机械和阻隔性能

摘要 纤维素被认为是满足生物相容性和环保食品包装需求的替代品。本研究的目的是评估由再生纤维素与聚乙烯醇组合而成的复合薄膜。甘油用作增塑剂。数学模型用于描述薄膜结构对机械（拉伸强度、断裂伸长率）和阻隔性能（水蒸气渗透性、阻光性能和透明度）的影响。通过光谱分析（FT-IR 和 UV-VIS-NIR）、扫描电子显微镜和差示扫描量热法评估形态、结构和热性能。模型预测纤维素-甘油-聚乙烯醇薄膜的拉伸强度值为 25.9 至 369 MPa，类似于合成聚合物薄膜的拉伸强度值。所开发薄膜的断裂伸长率 (0.89-18.7%) 低于合成聚合物薄膜。获得的水蒸气渗透率（2.32·10-11 - 3.01·10-11 g/s·m·Pa）高于石化塑料。用聚乙烯醇增强的纤维素膜显示出光滑的表面。结果表明，用纤维素-聚乙烯醇-甘油制备具有增强机械性能的复合薄膜是可行的。所得薄膜显示出最高的透明度值。甘油的添加产生了具有紫外线防护作用的薄膜，这在食品包装中对于防止脂质氧化变质很重要。01·10−11 g/s·m·Pa)高于石化塑料。用聚乙烯醇增强的纤维素膜显示出光滑的表面。结果表明，用纤维素-聚乙烯醇-甘油制备具有增强机械性能的复合薄膜是可行的。所得薄膜显示出最高的透明度值。甘油的添加产生了具有紫外线防护作用的薄膜，这在食品包装中可能很重要，以防止脂质氧化变质。01·10−11 g/s·m·Pa)高于石化塑料。用聚乙烯醇增强的纤维素膜显示出光滑的表面。结果表明，用纤维素-聚乙烯醇-甘油制备具有增强机械性能的复合薄膜是可行的。所得薄膜显示出最高的透明度值。甘油的添加产生了具有紫外线防护作用的薄膜，这在食品包装中可能很重要，以防止脂质氧化变质。