Evaluation of the technical feasibility of commercial compatibilizers for multilayer film recycling

Abstract

This study aims to evaluate major commercial compatibilizers for the recycling of multilayer films. Samples were sourced from post-consumer and post-industrial materials and processed using standard industrial equipment, including agglomerators, granulators (knife mills), and an extruder for compatibilizer incorporation. The materials were subsequently tested according to the criteria established by ASTM D648 (Standard Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise Position) and ASTM D6110 (Standard Test Method for Determining the Charpy Impact Resistance of Notched Specimens of Plastics). Compatibilizing agents were added at the same concentration and using a consistent incorporation methodology to produce pellets, which were then injection-molded into test specimens for evaluation. The raw material was initially characterized using Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). These techniques were used to assess the basic composition of the material under study, as well as its thermal decomposition behavior and inorganic residue content. Overall, the resulting specimens tested using HDT and Charpy impact tests showed significant changes in certain mechanical and thermal properties, while others remained virtually unchanged. The results indicate that specific compatibilizers demonstrated great potential for the recycling of multilayer films.