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  • Title: Thermoplastic starch/polyester films: effects of extrusion process and poly (lactic acid) addition.
    Author: Shirai MA, Olivato JB, Garcia PS, Müller CM, Grossmann MV, Yamashita F.
    Journal: Mater Sci Eng C Mater Biol Appl; 2013 Oct; 33(7):4112-7. PubMed ID: 23910321.
    Abstract:
    Biodegradable films were produced using the blown extrusion method from blends that contained cassava thermoplastic starch (TPS), poly(butylene adipate-co-terephthalate) (PBAT) and poly(lactic acid) (PLA) with two different extrusion processes. The choice of extrusion process did not have a significant effect on the mechanical properties, water vapor permeability (WVP) or viscoelasticity of the films, but the addition of PLA decreased the elongation, blow-up ratio (BUR) and opacity and increased the elastic modulus, tensile strength and viscoelastic parameters of the films. The films with 20% PLA exhibited a lower WVP due to the hydrophobic nature of this polymer. Morphological analyses revealed the incompatibility between the polymers used.
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