INVESTIGADORES
MANFREDI liliana Beatriz
artículos
Título:
Crystallization behavior of Poly(3-hydroxybutyrate) nanocomposites based on modified clays: effect of organic modifiers
Autor/es:
D.A.DAMICO; L. B. MANFREDI; V. P. CYRAS
Revista:
THERMOCHIMICA ACTA
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 544 p. 47 - 53
ISSN:
0040-6031
Resumen:
Isothermal and non-isothermal crystallization kinetics of nanocomposites of poly(3-hydroxybutyrate) (PHB) with 4 wt% of montmorillonite Cloisite®Na+ (CNa+) and chemically modified clays Cloisite®C15A and C93A (C15A and C93A) prepared by solution casting have been investigated by differential scanning calorimetry. Nanoparticles addition did not significantly affect the crystallinity and melting temperatures of the PHB, regardless the type of clay. Several models such as the Liu-Mo, Avrami, Lauritzen-Hoffman and isoconversional were found to provide a fairly satisfactory description of the crystallization kinetics of PHB and its nanocomposites. The results showed a slightly effect of the CNa+ and C93A on the crystallization kinetics parameters of PHB. However, a retarded effect on the crystallization rate of the polymer was found when C15A clay was added. It was attributed to the high dispersion of this clay in the polymer. Consequently, the dispersion and type of clay influence the crystallization kinetics of PHB.