INVESTIGADORES
MANFREDI Liliana Beatriz
artículos
Título:
Fully bio-based and biodegradable polylactic acid/ poly(3-hydroxybutyrate) blends: use of a common plasticizer as performance improvement strategy
Autor/es:
D.A.DAMICO; M. L. IGLESIAS MONTES; L. B. MANFREDI; V. P. CYRAS
Revista:
POLYMER TESTING
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 2016 vol. 49 p. 22 - 28
ISSN:
0142-9418
Resumen:
Biodegradable polymeric blends based on Poly(3-hydroxybutyrate) (PHB) and Polylactic Acid (PLA) were prepared by melt mixing. Trybutyrin, a bio-based plasticizer, was added at a fixed proportion in all blends. Crystal structure, percentage of crystallinity, miscibility, mechanical properties and permeation of fully biodegradable PHB/PLA blends were investigated by Differential Scanning Calorimetry (DSC), Fourier Transformed Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), tensile tests and water vapor permeation tests in detail. From the thermal test, two glass transition temperatures were found for the whole range of compositions, which reveals the immiscibility between PHB and PLA. Moreover, the biphasic melt further confirms this fact. Tensile tests showed an increase in the elongation at break with the PLA content. SEM images reveal debonding between the interfacial surfaces, which justifies the increase in the elongation at break. Water vapor permeation values for blends were slightly higher than that of the plasticized pristine polymer. The plasticized polymer blends showed valuable properties to extend the applications of PHB and PLA.