Plasticization of poly(lactic acid) through blending with oligomers of lactic acid: Effect of the physical aging on properties

[Display omitted] •PLA was blended with oligomers of lactic acid (OLAs) to modulate its properties.•The effect of physical aging on properties and morphology was pointed out.•The effectiveness of OLAs as plasticizers was assessed.•Transport and migration properties suggest films applicability in packaging. Two oligomers of lactic acid (OLAs), carboxyl (OLA-COOH) or hydroxyl (OLA-OH) end capped, were employed to modulate physical and mechanical properties of poly(lactic acid), PLA. Blends up to 25wt.% by weight of OLAs were prepared by melt mixing. Mechanical, thermal and transport properties of the materials were tested as a function of OLA functional moieties and blend composition. Moreover, the effect of physical aging on structure and properties of blends was studied by storing the samples in controlled temperature and humidity conditions, up to 8weeks. OLAs significantly affect mechanical properties of PLA; blends showed an interesting ductility even after aging, suggesting their use as flexible films. Moreover, gas transport and total migration properties of blends are suitable for packaging applications.