Foamlike xanthan gum/clay aerogel composites and tailoring properties by blending with agar
Tipo de documentoArtículo
Fecha de publicación2014
Condiciones de accesoAcceso restringido por política de la editorial
Foamlike aerogel composites based on renewable xanthan gum (XG) and sodium montmorillonite clay (Na+- MMT) have been prepared using an environmentally friendly freeze-drying process. Additionally, the biobased polysaccharide agar was used to improve the properties of XG/clay aerogels. Fourier transform infrared spectroscopy showed molecular interactions between biopolymers and clay in the aerogel composites. A wide range of microstructures and mechanical properties were obtained with a minimal variation in the density by changing the blended ratio of xanthan gum and agar, with particular emphasis on the addition of 2.5% agar to XG/clay aerogels, which significantly enhanced the mechanical properties. Thermogravimetric analysis revealed that clay improved the thermal stability of aerogels; however, the thermal stability of blends of xanthan gum and agar worsened. Flammability was analyzed through cone calorimeter, which suggested xanthan gum/clay aerogels possessed lower flammability than other typical foams. Clay served as a heat and mass transport, which significantly improved the flame retardancy of the base aerogels.
CitaciónWang, L.; Schiraldi, D.; Sanchez, M. Foamlike xanthan gum/clay aerogel composites and tailoring properties by blending with agar. "Industrial & engineering chemistry research", 2014, vol. 53, núm. 18, p. 7680-7687.
Versión del editorhttp://pubs.acs.org/articlesonrequest/AOR-YT8sZp5vvxyGJB5Ncieb
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