Flexible plastic packagings are rapidly gaining market share since they offer significant functional benefits. However, they also pose a challenge from a recycling perspective. In fact, due to the presence of different polymeric fractions and to contamination by organic substances and out-of-target materials, such as paper and metals, the mechanical properties of the recycled material are relatively poor.

Addition of nanoparticles to plastic waste can offer the combinations of improved properties and processing, and reduce operational cost. Moreover, in recent studies it was demonstrated that they can also act as blend compatibilizers.

The aim of this study is the upgrading of Fil-s (acronym for film-small), a fraction of mixed plastic waste stream obtained by the separation and mechanical recycling of post-consumer packaging films of small size. Physical, chemical and rheological characterization evidenced that Fil-s stream is mainly composed of polyethylene and a smaller fraction of polypropylene. With the purpose to improve the performances of Fil-s, lamellar and acicular organoclays were melt compounded with the recycled material in a twin-screw extruder. Moreover, in order to enhance the compatibility between the polyolefin components and the nanofiller dispersion in the mixed polymer matrix, the functionalization of Fil-s with maleic anhydride (MAH) was realized by reactive extrusion.

Morphological, thermal, rheological and mechanical properties of the functionalized materials and the nanocomposite systems were extensively discussed. The positive effect of the MAH-grafting on the compatibilization between the two polyolefin components of Fil-s was pointed out and an interesting improvement in ductility of Fil-s was obtained. The further addition of the nanoclays also significantly increased the stiffness of the systems.

柔性塑料包装具有显着的功能优势，因此正在迅速获得市场份额。但是，从回收的角度来看，它们也构成了挑战。实际上，由于存在不同的聚合物部分，并且受到有机物质和非目标材料（例如纸张和金属）的污染，回收材料的机械性能相对较差。

将纳米颗粒添加到塑料废料中可以提供改进的性能和加工性能的组合，并降低运营成本。此外，在最近的研究中证明它们也可以用作共混增容剂。

这项研究的目的是对Fil-s（小薄膜的缩写）进行升级，Fil-s是通过分离和机械回收小尺寸消费后包装薄膜而获得的一部分混合塑料废物流。物理，化学和流变学特征证明Fil-s流主要由聚乙烯和少量的聚丙烯组成。为了改善Fil-s的性能，在双螺杆挤出机中将层状和针状有机粘土与回收的材料熔融混合。此外，为了增强聚烯烃组分与混合聚合物基体中的纳米填料分散体之间的相容性，通过反应挤出实现了Fil-s与马来酸酐（MAH）的功能化。

广泛讨论了功能化材料和纳米复合材料系统的形貌，热学，流变学和机械性能。指出了MAH接枝对Fil-s的两种聚烯烃组分之间的相容化的积极作用，并且获得了Fil-s的延展性的令人感兴趣的改善。纳米粘土的进一步添加也显着增加了系统的刚度。