Nanotechnology is considered a highly valued technology to reduce the current environmental problem that is derived from plastic accumulation. The need to recycle and reuse packaging materials is essential to create a sustainable society towards a circular economy. However, the reprocessing of polymers leads to the deterioration of their characteristic mechanical, optical, thermal, and barrier properties due to the degradation of their polymeric chains. When recycled polymers are reinforced with nanoadditives, aforementioned properties improve and their use in the circular economy is more viable. In this review, different types of nanoadditives and recent advances in the development of recycled polymer nanocomposites reinforced with nanoadditives will be presented. In addition, there is a description of two research topics of current interest, recyclability of nanocomposites and safety for food packaging applications. Recyclability of nanocomposites requires a study that includes the nature of the polymer matrix, the type of polymer and the concentration of nanofiller, the morphology, the presence of additives, and the conditions of the thermal‐mechanical cycles. Finally, safety section is dedicated to clarify the migration process in nanoreinforced‐recycled polymers in order to assess their safety for food contact applications.

中文翻译：

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在用于食品包装的回收聚合物中使用纳米添加剂：特性、可回收性和安全性

纳米技术被认为是一种极具价值的技术，可以减少目前由塑料积累引起的环境问题。回收和再利用包装材料的需求对于创建一个面向循环经济的可持续社会至关重要。然而，由于聚合物链的降解，聚合物的再加工导致其特征机械、光学、热和阻隔性能的劣化。当用纳米添加剂增强再生聚合物时，上述特性会得到改善，并且它们在循环经济中的应用更加可行。在这篇综述中，将介绍不同类型的纳米添加剂以及纳米添加剂增强的再生聚合物纳米复合材料的最新进展。此外，还有对当前感兴趣的两个研究课题的描述，纳米复合材料的可回收性和食品包装应用的安全性。纳米复合材料的可回收性需要一项研究，包括聚合物基质的性质、聚合物的类型和纳米填料的浓度、形态、添加剂的存在以及热机械循环的条件。最后，安全部分致力于阐明纳米增强再生聚合物的迁移过程，以评估它们在食品接触应用中的安全性。