Review on the Effect of Number of Recycling on the Thermo-Physical Features of Thermoplastic Materials

Abstract

Most recycling processes create new products that are poor in terms of performance and usage for the newly applications. In order to produce high-quality products from plastic waste and bring back these valuable materials to the economy after their end of life, it is important to know the change in polymer properties during cyclic reprocessing. This review study introduces an investigation to understand the effects of cyclic reprocessing on the morphology and properties of main recyclable thermoplastic materials: polypropylene (PP), high-density polyethylene (HDPE), low-density polyethylene (LDPE), polyamide (PA), polyethylene terephthalate (PET) and polyvinylchloride (PVC). The work has included the collecting of most corresponding resources and analyzing the measured thermo-physical and mechanical properties for the selected polymers. The recycling of the polymeric materials has shown different behaviors to the change happened in the thermo-mechanical properties due to the recycling for several times. Furthermore, the study may include the improving of thermal and mechanical properties of the post products using suitable blends, elastomers, compatibilizers or nano-materials.