Properties of bio-based gum Arabic/clay aerogels
Lightweight bio-based aerogels from sustainable gum Arabic (GA) and sodium montmorillonite (Na+-MMT) clay were prepared by means of a simple freeze-drying process. GA/clay aerogels showed high porosity (87.9%–94.9%) of mainly open type and the mechanical properties were improved by the clay. When 40...
| Autores: | , , |
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| Formato: | artículo |
| Fecha de publicación: | 2016 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/91453 |
| Acesso em linha: | https://hdl.handle.net/2117/91453 https://dx.doi.org/10.1016/j.indcrop.2016.05.001 |
| Access Level: | acceso abierto |
| Palavra-chave: | Gums and resins--Testing Aerogels Gum arabic Clay Porosity Flame retardancy Thermal stability Aerogels -- Proves Gomes i resines -- Proves Àrees temàtiques de la UPC::Enginyeria dels materials::Materials naturals::Resines Àrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials |
| Resumo: | Lightweight bio-based aerogels from sustainable gum Arabic (GA) and sodium montmorillonite (Na+-MMT) clay were prepared by means of a simple freeze-drying process. GA/clay aerogels showed high porosity (87.9%–94.9%) of mainly open type and the mechanical properties were improved by the clay. When 40% of clay was added to pure GA, the specific modulus and the absorbed energy of resultant aerogels increased by 1.6 and 4.2 times respectively. On the other hand, the exponent value for modulus in the power-law model for cellular materials increased from 1.95 to 3.28 due to the more anisotropic structures induced by the presence of the clay. In terms of thermal stability and flame retardancy, clay content played a dominant role. With 50% of clay loading, the initial decomposition temperature increased by nearly 16 °C and the peak of heat release rate was 3-fold reduced. |
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