Recycling of compatibilized and uncompatibilized nylon/polypropylene blends

摘要

The recycling of compatibilized and uncompatibilized nylon6/polypropylene blends has been carried out by repetitive extrusions. The change of the properties of the blends is a function not only of the number of reprocessing steps but also of the type of com- patibilizer. The worsening of the mechanical properties is small and, indeed, some improvement can be observed after one or two extrusion steps for some blends. It is hypothesised that the decrease of the molecular weight, the typical effect occurring during this thermomechanical treatment, is counterbalanced and overcome by the possible formation of new copolymers that act as bridges between the two phases. This behaviour is displayed by the uncompatibilized blend and by the blend with acrylic functionalized polypropylene, but not by the blend with maleic functionalized PP because of the good morphology and the high thermal stability.