PLA/PBAT blends for blown film extrusion

Films of biodegradable PLA/PBAT blends with PBAT content of 10–90 wt% were obtained by extrusion blowing. PLA/PBAT blends were characterized by FT-IR, DSC, TGA and SEM. Tensile properties and tear strength of the films were also determined. It was shown that despite thermodynamicimmiscibility of PLA and PBAT, addition of PBAT in amounts above 50 wt% allows obtaining films with good functional properties. Optimal properties were obtained with PBAT content of 60 or 70 wt%. Tensile strength was 36.7–38.7 MPa, elongation at break 357–388% and tear strength 11–22 N/mm.