In this research, post-consumer polyethylene terephthalate (PC-PET) bottles were processed and characterized. The aim was to investigate the influence of number and type of melt processing steps and the presence of contaminants on the mechanical properties and moldability of PC-PET. Results and observations of current research showed that direct processing of PC-PET by injection molding (i.e. skipping melt extrusion step) is preferable in order not to deteriorate mechanical properties especially the toughness of PC-PET. Contaminants found in PC-PET waste stream include labels and bottle cap rings made of polyethylene (PE) and paper labels. Unlike PE contaminants, paper contaminants can drastically reduce toughness of PC-PET and severely affect its moldability. Molded samples of PC-PET containing traces of papers appeared incoherent and fragmented pieces due to poor adhesion between PET and papers. The recommendation given by current research is to remove paper contaminants from PC-PET waste stream before melt processing and melt processing steps should be limited.
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| http://dx.doi.org/10.1016/j.wasman.2018.09.052 | DOI Listing |
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