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Abstract:

Nanocomposite materials based on a starch matrix reinforced with very small amounts of multi-walled carbon nanotubes (MWCNTs) (from 0.005 wt% to 0.055 wt%) were developed. The material's dynamic-mechanical and water vapor permeability properties were investigated. An increasing trend of storage modulus (E′) and a decreasing trend of water vapor permeability (WVP) with filler content were observed at room temperature. For the composite with 0.055 wt% of filler, E′ value was about 100% higher and WVP value was almost 43% lower than the corresponding matrix values. MWCNTs were wrapped in an aqueous solution of a starch-iodine complex before their incorporation into the matrix, obtaining exceptionally well-dispersed nanotubes and optimizing interfacial adhesion. This excellent filler dispersion leads to the development of an important contact surface area with the matrix material, producing remarkable changes in the starch-rich phase glass transition temperature even in composites with very low filler contents. This transition is shifted towards higher temperatures with increasing content of nanotubes. So at room temperature, some composites are in the rubber zone while others, in the transition zone. Therefore, this change in the material glass transition temperature can be taken as responsible for the important improvements obtained in the composites WVP and E′ values for carbon nanotubes content as low as 0.05 wt%. © 2011 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Biodegradable starch based nanocomposites with low water vapor permeability and high storage modulus
Autor:Famá, L.; Rojo, P.G.; Bernal, C.; Goyanes, S.
Filiación:Dep. de Física, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Ciudad Autónoma de Buenos Aires, Argentina
IFIBA (CONICET), Argentina
Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850, C1063ACV, Ciudad Autónoma de Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Argentina
Grupo de Nuevos Materiales, Facultad de Ingeniería Química, Universidad Pontificia Bolivariana, Circular 1, No 70-01 Medellín, Colombia
Palabras clave:Dynamic mechanical properties; Starch-iodine complex; Starch-MWCNTs nanocomposites; Water vapor permeability; Biodegradable starch; Contact surface area; Dynamic mechanical property; Filler contents; Filler dispersion; Higher temperatures; Interfacial adhesions; Low water; matrix; Matrix materials; Room temperature; Starch-iodine complex; Transition zones; Water vapor permeability; Well-dispersed; Adhesion; Dynamics; Elastic moduli; Fillers; Glass; Glass transition; Iodine; Multiwalled carbon nanotubes (MWCN); Nanocomposites; Reinforced plastics; Starch; Temperature; Water vapor; Mechanical permeability
Año:2012
Volumen:87
Número:3
Página de inicio:1989
Página de fin:1993
DOI: http://dx.doi.org/10.1016/j.carbpol.2011.10.007
Título revista:Carbohydrate Polymers
Título revista abreviado:Carbohydr Polym
ISSN:01448617
CODEN:CAPOD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01448617_v87_n3_p1989_Fama

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Citas:

---------- APA ----------
Famá, L., Rojo, P.G., Bernal, C. & Goyanes, S. (2012) . Biodegradable starch based nanocomposites with low water vapor permeability and high storage modulus. Carbohydrate Polymers, 87(3), 1989-1993.
http://dx.doi.org/10.1016/j.carbpol.2011.10.007
---------- CHICAGO ----------
Famá, L., Rojo, P.G., Bernal, C., Goyanes, S. "Biodegradable starch based nanocomposites with low water vapor permeability and high storage modulus" . Carbohydrate Polymers 87, no. 3 (2012) : 1989-1993.
http://dx.doi.org/10.1016/j.carbpol.2011.10.007
---------- MLA ----------
Famá, L., Rojo, P.G., Bernal, C., Goyanes, S. "Biodegradable starch based nanocomposites with low water vapor permeability and high storage modulus" . Carbohydrate Polymers, vol. 87, no. 3, 2012, pp. 1989-1993.
http://dx.doi.org/10.1016/j.carbpol.2011.10.007
---------- VANCOUVER ----------
Famá, L., Rojo, P.G., Bernal, C., Goyanes, S. Biodegradable starch based nanocomposites with low water vapor permeability and high storage modulus. Carbohydr Polym. 2012;87(3):1989-1993.
http://dx.doi.org/10.1016/j.carbpol.2011.10.007