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05.12.2019 | Original Research

Processing and functional assessment of anisotropic cellulose nanofibril/Alolt/sodium silicate: based aerogels as flame retardant thermal insulators

verfasst von: Selestina Gorgieva, Urška Jančič, Silvo Hribernik, Darinka Fakin, Karin Stana Kleinschek, Sergej Medved, Tomaž Fakin, Mojca Božič

Erschienen in: Cellulose

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Abstract

This work concerns freeze-dry processing of CNF aerogels, including aluminum hydroxide trihidrate (Alolt) particles and Sodium silicate, as active and passive flame retardants, respectively. Alkalinity of Sodium silicate promotes stability, dissociation and co-precipitation of Al(OH)₃ component onto CNFs. The (auto)fluorescence-enabled confocal microscopy enabled visualization of anisotropic microstructure with open and closed-cell segments, depicting the Alolt as single and aggregated particles. Low thermal conduction (~ 0.045 W/mK) was estimated, irrespective of composition, while Alolt was found to reduce (by 30%) the aerogel moisture content. Sodium silicate promotes char formation as passive action, reducing the evolution of gaseous species, while burning test shows complete flame retardation through active endothermic reaction assigned to Alolt. Additive combinations did not amplify, nor diminish, the flame retardant effect of particular component, yet affected positively the elastic modulus. Considering simple “green” processing, low additive load, and high insulation and flame retardant efficiency, these aerogels hold promise as thermal insulation materials.

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Titel: Processing and functional assessment of anisotropic cellulose nanofibril/Alolt/sodium silicate: based aerogels as flame retardant thermal insulators
verfasst von: Selestina Gorgieva
Urška Jančič
Silvo Hribernik
Darinka Fakin
Karin Stana Kleinschek
Sergej Medved
Tomaž Fakin
Mojca Božič
Publikationsdatum: 05.12.2019
Verlag: Springer Netherlands
Erschienen in: Cellulose
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-019-02901-3