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Improved degradability and mechanical properties of bacterial cellulose grafted with PEG derivatives
Cellulose ( IF 4.9 ) Pub Date : 2023-04-04 , DOI: 10.1007/s10570-023-05163-2
Edina Rusen , Gabriela Isopencu , Gabriela Toader , Aurel Diacon , Adrian Dinescu , Alexandra Mocanu

New functional materials based on bacterial cellulose (BC) grafted with poly(ethylene glycol) PEG derivatives for food packaging applications and a facile method for assessing the degradation rates of the final materials are presented. Two types of materials were obtained by grafting the BC films (BCF), respectively lyophilized BC pellicles (BCL) with three PEG derivatives of different molecular weights through radical polymerization. The BC based polymer materials were characterized by SEM, FT-IR, contact angle measurements, and TGA. Tensile tests and DMA analysis were used to compare the two types of materials in terms of shear-modulus, tensile strength and performance giving suitable information for food packaging applications. A new degradation evaluation method, that we propose herein, offers quantitative information about the degradation process in contrast with the SEM analysis, primarily used in literature, which is not decisive in all cases because it characterizes only small parts of the sample. The degradation rates evidenced that the PEG derivatives of higher molecular weight grafted on the surface of BCF led to an acceleration of the degradation process compared with the pristine samples. A good correlation was obtained between the samples analyzed by SEM after the degradation process and their degradation rates were mathematically determined.



中文翻译:

PEG衍生物接枝细菌纤维素的可降解性和机械性能改善

基于细菌纤维素 (BC) 的新型功能材料与聚乙二醇 PEG 衍生物接枝,用于食品包装应用,并介绍了一种评估最终材料降解率的简便方法。通过自由基聚合将三种不同分子量的PEG衍生物分别接枝到BC膜(BCF)和冻干的BC薄膜(BCL)上得到两种材料。基于 BC 的聚合物材料通过 SEM、FT-IR、接触角测量和 TGA 进行表征。拉伸测试和 DMA 分析用于比较两种类型的材料的剪切模量、拉伸强度和性能,为食品包装应用提供合适的信息。我们在此提出的一种新的退化评估方法,与主要用于文献的 SEM 分析相比,提供了有关降解过程的定量信息,SEM 分析在所有情况下都不是决定性的,因为它仅表征样品的一小部分。降解率表明,与原始样品相比,接枝在 BCF 表面的高分子量 PEG 衍生物导致降解过程加速。在降解过程后通过 SEM 分析的样品之间获得了良好的相关性,并且在数学上确定了它们的降解速率。降解率表明,与原始样品相比,接枝在 BCF 表面的高分子量 PEG 衍生物导致降解过程加速。在降解过程后通过 SEM 分析的样品之间获得了良好的相关性,并且在数学上确定了它们的降解速率。降解率表明,与原始样品相比,接枝在 BCF 表面的高分子量 PEG 衍生物导致降解过程加速。在降解过程后通过 SEM 分析的样品之间获得了良好的相关性,并且在数学上确定了它们的降解速率。

更新日期:2023-04-04
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