DYNA JOURNAL ENGINEERING

Key words:

Reciclaje, plásticos biodegradables, polipropileno, poliestireno, tereftalato de polietileno

Article type:

ARTICULO DE INVESTIGACION / RESEARCH ARTICLE

Section:

RESEARCH ARTICLES

In this work, the presence of biodegradable polymers in recycled plastic materials was characterized using readily available techniques. Recycled polypropylene (PP), polystyrene (PS) and polyethylene terephthalate (PET) were studied. The contamination of these plastics with polylactic acid (PLA), polyhydroxybutyrate (PHB) and thermoplastic starch (TPS) was simulated using 10 wt.% of the contaminant. Fourier
transform infrared spectrometry (FTIR) and differential scanning calorimetry (DSC) were used as characterization techniques.
In addition, the effect of aging on recycled products from PET blends contaminated with TPS and PHB was studied. The results show changes in the intensity of the FTIR spectra bands of the PS and PP blends contaminated with biodegradable polymers. By DSC, changes in the cold crystallization peak
of recycled PET are observed when mixed with TPS and PHB.
When the contaminant is PLA, the changes are masked due to
the thermal characteristics of both materials. In PS, changes
in the calorimetric curves are identified by the presence of PLA
and PHB. Contamination with PLA, PHB and TPS hinders the
processing of recycled PET after one year of storage due to the
aging of the material.