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Effect of glycerol on the electrical properties and phase behavior of cassava starch biopolymers

Ayala Valencia, Germán and Agudelo Henao, Ana Cecilia and Vargas Zapata, Rubén Antonio (2012) Effect of glycerol on the electrical properties and phase behavior of cassava starch biopolymers. Dyna; Vol. 79, núm. 171 (2012); 138-147 DYNA; Vol. 79, núm. 171 (2012); 138-147 2346-2183 0012-7353 .

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Films of different concentrations of glycerol/starch (G/S) blends were prepared and analyzed by impedance spectroscopy (IS), differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). The dc-conductivity of the films increases with increasing both the glycerol content and temperature. A power-law dispersive behavior of the frequency-dependent conductivity at high frequencies has been observed in all G/S films in the blend compositions prepared, similar to that observed in other solid ionic conductors and known as a “universal dynamic response”. The electrical conductivity enhancement is consistent with the subtle changes in the –OH glycerol groups coordination with the starch chains introduced by increasing the glycerol content and temperature. A stable single phase is revealed under the electrical measurement conditions up to approximately 100 °C for all concentrations, but the stability can be maintained up to higher temperatures (150°C) at glycerol concentrations below G/S = 0.4.

Tipo de documento:Artículo - Article
Información adicional:Derechos de autor reservados
Palabras clave:Cassava starch, glycerol, electrical conductivity, phase behavior.
Unidad administrativa:Revistas electrónicas UN > Dyna
Código ID:23064
Enviado por : Dirección Nacional de Bibliotecas STECNICO
Enviado el día :27 Junio 2014 14:03
Ultima modificación:06 Junio 2018 10:57
Ultima modificación:06 Junio 2018 10:57
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