Processing of virgin and recycled polytethylene terephthalate) (PET) in a twin screw extruder evidences the degradative effect caused by thermal decomposition of polytvinyl chloride) (PVC) and other impurities, e.g. adhesives, at the processing temperature. Lower melt viscosity and molecular weight, along with higher carboxylic end group concentration, were observed for recycled PET, the extent depending on PET purity. In an attempt to investigate the correlation between the kinetics of degradation phenomena …
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