Artículo
Biodegradable materials from grafting of modified PLA onto starch nanocrystals
Garcia, Nancy Lis
; Lamanna, Melisa Elsa
; D'accorso, Norma Beatriz
; Dufresne, A.; Aranguren, Mirta Ines
; Goyanes, Silvia Nair
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Fecha de publicación:
10/2012
Editorial:
Elsevier
Revista:
Polymer Degradation And Stability
ISSN:
0141-3910
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
PLA was grafted onto starch nanoparticles using a novel synthetic strategy consisting of three reaction steps. The first step was aimed to protect the hydroxyl groups of PLA by benzoylation (PLABz), the second one involved the activation of carboxyl groups using thionyl chloride and the last reaction was the grafting of the modified PLA onto the starch nanoparticles (PLASTARCH). The thermal behavior of the composite obtained by this method was very different from that displayed by the physical mixture of PLA and the starch nanoparticles (PLA-NC blend). The benzoylation step that leads to PLABz produces an increase of the molecular mobility, resulting in lower glass transition temperature, Tg, than that of the original PLA; a change that was observed in the DSC thermograms of the samples. On the other hand, the Tg of the PLASTARCH was similar to that of the PLA as a consequence of two opposite effects acting simultaneously: a free volume increase due to the presence of benzoyl groups and a confinement of the polymer chain, originating from the grafting onto NC. The material obtained by chemical modification (PLASTARCH) has a degradation temperature slightly lower than that of PLA, which does not affect its potential use in the packaging industry.
Palabras clave:
Chemically modified starch
,
Poly (lactid acid)
,
Nanocomposites
,
Nanocrystals
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Identificadores
Colecciones
Articulos(CIHIDECAR)
Articulos de CENTRO DE INVESTIGACIONES EN HIDRATOS DE CARBONO
Articulos de CENTRO DE INVESTIGACIONES EN HIDRATOS DE CARBONO
Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Articulos de INST.DE FISICA DE BUENOS AIRES
Articulos(OCA CIUDAD UNIVERSITARIA)
Articulos de OFICINA DE COORDINACION ADMINISTRATIVA CIUDAD UNIVERSITARIA
Articulos de OFICINA DE COORDINACION ADMINISTRATIVA CIUDAD UNIVERSITARIA
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Garcia, Nancy Lis; Lamanna, Melisa Elsa; D'accorso, Norma Beatriz; Dufresne, A.; Aranguren, Mirta Ines; et al.; Biodegradable materials from grafting of modified PLA onto starch nanocrystals; Elsevier; Polymer Degradation And Stability; 97; 10; 10-2012; 2021-2026
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