Low flammability, foam-like materials based on ammonium alginate and sodium montmorillonite clay

Low flammability, foam-like materials based on bio-based, renewable ammonium alginate and sodium montmorillonite clay were fabricated through a simple, environmentally-friendly freeze-drying process in which water is used as solvent. These materials exhibit mechanical properties similar to those of...

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Bibliographic Details
Published in:Polymer (Guilford) 2012-11, Vol.53 (25), p.5825-5831
Main Authors: Chen, Hong-Bing, Wang, Yu-Zhong, Sánchez-Soto, Miguel, Schiraldi, David A.
Format: Article
Language:English
Subjects:
Aerogel
Aerogels
Alginate
Alginates
Applied sciences
Assaigs de comportament davant el foc
calcium
Calcium carbonate
calorimetry
Clay
Clay (material)
Composites
Crosslinking
Enginyeria dels materials
Exact sciences and technology
Fire testing
Flammability
foams
Forms of application and semi-finished materials
freeze drying
heat
ions
Materials plàstics i polímers
Mechanical properties
microstructure
Montmorillonite
Polymer industry, paints, wood
polymers
Polímers
Propietats tèrmiques
Sodium
sodium alginate
Technology of polymers
thermal stability
Àrees temàtiques de la UPC
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Summary:Low flammability, foam-like materials based on bio-based, renewable ammonium alginate and sodium montmorillonite clay were fabricated through a simple, environmentally-friendly freeze-drying process in which water is used as solvent. These materials exhibit mechanical properties similar to those of rigid PU foams or balsa; the compressive modulus (1–97 MPa) and density (0.047–0.174 g/cm3) increase with increasing solids content, with an associated change from a layered to network microstructure structure. Calcium ions, either added directly or indirectly via CaCO3/gluconolactone (GDL) are an effective crosslinking agent for alginate, with the GDL route providing the greatest enhancement of mechanical properties. The thermal stability of the aerogels is also enhanced by the presence of crosslinking. The alginate/clay aerogels possess inherently low flammability, as measured by cone calorimetry, with heat release values decreasing as the proportion of clay in the composites is increased. [Display omitted]
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2012.10.029