In this study, polyvinyl alcohol (PVA) films filled with nanocellulose particles were developed for food packaging. In particular, the effect of the weak magnetic field-induced alignment of the nanocellulose filler in PVA blended with rod-shaped cellulose nanocrystals (CNCs) and cellulose nanofibrils (CNFs) on the physicochemical properties of the respective blends was investigated. For the alignment of the nanocellulose particles (6% with respect to PVA), a film-forming solution of each blend was cast and a homogeneous magnetic field of the order of milli Tesla was applied during drying. Microscopic investigations were conducted to analyze the dispersion of the CNCs and CNFs in the PVA matrix. The influence of particle alignment was examined in terms of the microstructure, intermolecular interactions, crystallinity, and hydration state of the film, as well as water migration. The applied magnetic field induced the orientation of the nanocellulose fillers, leading to their improved dispersion in the PVA matrix. The uniform structure formed owing to the magnetically induced alignment of nanocellulose led to enhanced mechanical, barrier, and hydrophobic properties, as well as thermal stability of the two blends. The improvement was more evident for the CNC/PVA blend compared to the CNF/PVA one. The applied magnetic field decreased the fluidity of the film and increased the number of water molecules bound to PVA. When applied in the preservation of strawberries, the films exposed to a magnetic field facilitated better protection and firmness of the fruit.

在这项研究中，开发了用于食品包装的填充有纳米纤维素颗粒的聚乙烯醇 (PVA) 薄膜。特别是，研究了与棒状纤维素纳米晶体 (CNC) 和纤维素纳米原纤维 (CNF) 混合的 PVA 中纳米纤维素填料的弱磁场诱导排列对各自共混物的理化性质的影响。为了排列纳米纤维素颗粒（相对于 PVA 为 6%），浇铸每种混合物的成膜溶液，并在干燥过程中施加毫特斯拉量级的均匀磁场。进行显微研究以分析 CNC 和 CNF 在 PVA 基质中的分散。从微观结构、分子间相互作用、结晶度、和膜的水合状态，以及水的迁移。施加的磁场诱导纳米纤维素填料的取向，导致它们在 PVA 基质中的分散得到改善。由于纳米纤维素的磁诱导排列而形成的均匀结构导致增强的机械、阻隔和疏水性能，以及两种混合物的热稳定性。与 CNF/PVA 混合物相比，CNC/PVA 混合物的改进更为明显。施加的磁场降低了薄膜的流动性并增加了与 PVA 结合的水分子的数量。当应用于草莓保鲜时，暴露在磁场中的薄膜有助于更好地保护水果并使其坚固。导致它们在 PVA 基质中的分散性得到改善。由于纳米纤维素的磁诱导排列而形成的均匀结构导致增强的机械、阻隔和疏水性能，以及两种混合物的热稳定性。与 CNF/PVA 混合物相比，CNC/PVA 混合物的改进更为明显。施加的磁场降低了薄膜的流动性并增加了与 PVA 结合的水分子的数量。当应用于草莓保鲜时，暴露在磁场中的薄膜有助于更好地保护水果并使其坚固。导致它们在 PVA 基质中的分散性得到改善。由于纳米纤维素的磁诱导排列而形成的均匀结构导致增强的机械、阻隔和疏水性能，以及两种混合物的热稳定性。与 CNF/PVA 混合物相比，CNC/PVA 混合物的改进更为明显。施加的磁场降低了薄膜的流动性并增加了与 PVA 结合的水分子的数量。当应用于草莓保鲜时，暴露在磁场中的薄膜有助于更好地保护水果并使其坚固。以及两种共混物的热稳定性。与 CNF/PVA 混合物相比，CNC/PVA 混合物的改进更为明显。施加的磁场降低了薄膜的流动性并增加了与 PVA 结合的水分子的数量。当应用于草莓保鲜时，暴露在磁场中的薄膜有助于更好地保护水果并使其坚固。以及两种共混物的热稳定性。与 CNF/PVA 混合物相比，CNC/PVA 混合物的改进更为明显。施加的磁场降低了薄膜的流动性并增加了与 PVA 结合的水分子的数量。当应用于草莓保鲜时，暴露在磁场中的薄膜有助于更好地保护水果并使其坚固。