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Artículo

Non-isothermal crystallization kinetics from the melt of nanocomposites based on poly(3-hydroxybutyrate) and modified clays

D'amico, David AlbertoIcon ; Cyras, Viviana PaolaIcon ; Manfredi, Liliana BeatrizIcon
Fecha de publicación: 20/10/2014
Editorial: Elsevier
Revista: Thermochimica Acta
ISSN: 0040-6031
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Recubrimientos y Películas; Físico-Química, Ciencia de los Polímeros, Electroquímica; Bioproductos, Biomateriales, Bioplásticos, Biocombustibles, Bioderivados, etc.

Resumen

Poly(3-hydroxybutyrate) (PHB) films and its nanocomposites were obtained by casting. Three types of modified clays were used in order to improve the compatibility with the PHB. The films were characterized determining the thermal properties and the non-isothermal crystallization kinetic parameters from the melt. No change in the melting temperature of PHB was observed with the clay addition but the Tg diminished for the nanocomposites with the clay modified by ion exchange (MI) and by acid activation (MAI) to the PHB, due to the effect of the organic modifiers. From non-isothermal studies, it was observed a diminution of the peak of the crystallization temperature of PHB with the addition of clay at all of the cooling rates studied. The nanocomposites with MI and MAI exhibited the slowest crystallization rate among the materials, studied by the Liu–Mo model. However, the addition of the clay modified by silylation (MAGI) did not affect the crystallization rate of PHB. Effective activation energy (Ea) of the crystallization process of PHB and the nanocomposites was calculated by the isoconversional methods of Friedman and Vyazovkin. The Ea of the PHB increased with the addition of any type of the clays studied, but the rate of crystallization was reduced.
Palabras clave: Polyhydroxybutyrate , Clay , Nanocomposites , Non Isothermal Crystallization Kinetics
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Atribución-NoComercial-SinDerivadas 2.5 Argentina (CC BY-NC-ND 2.5 AR)
Identificadores
URI: http://hdl.handle.net/11336/5188
DOI: http://dx.doi.org/ 10.1016/j.tca.2014.08.023
URL: http://www.sciencedirect.com/science/article/pii/S0040603114003876
DOI: http://dx.doi.org/10.1016/j.tca.2014.08.023
Colecciones
Articulos(CCT - MAR DEL PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MAR DEL PLATA
Articulos(INTEMA)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Citación
D'amico, David Alberto; Cyras, Viviana Paola; Manfredi, Liliana Beatriz; Non-isothermal crystallization kinetics from the melt of nanocomposites based on poly(3-hydroxybutyrate) and modified clays; Elsevier; Thermochimica Acta; 594; 20-10-2014; 80-88
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