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Flame-retarded hydrophobic cellulose through impregnation with aqueous solutions and supercritical CO2

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Abstract

We have developed flame-retarded hydrophobic cellulose-based materials by producing in situ water-soluble and insoluble inorganic microparticles on various surfaces of native cellulose (filter paper and pure cotton textile). The nanoparticles were produced by simple impregnation of cellulose with two different aqueous solutions followed by a third impregnation with supercritical CO2. Finally, the composite cellulose materials were covered by a silicon-based polymer thin film, to turn it into hydrophobic and prevent the water-soluble particles from absorbing humidity. The obtained flame-retardant behaviour is due to a combination of mechanisms. The total treatment of cellulose has an impact on, both its surface morphology and its hydrophilicity. Thus, the hydrophobic nature of the silicon-based polymer film along with the roughness caused by the presence of the inorganic particles and the inherent roughness of native cellulose resulted in superhydrophobic behaviour. The same process-concept was also applied to regenerated (from newspaper) cellulose with ionic liquids. The produced materials were characterised by thermogravimetric analysis, differential scanning calorimetry, infrared spectroscopy, scanning electron microscopy and water contact angle measurements.

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Authors and Affiliations

  1. Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece

    Sofia Kivotidi, Costas Tsioptsias & Costas Panayiotou

  2. Department of Physics, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece

    Eleni Pavlidou

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  1. Sofia Kivotidi
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  2. Costas Tsioptsias
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  3. Eleni Pavlidou
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  4. Costas Panayiotou
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Correspondence to Costas Panayiotou.

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Kivotidi, S., Tsioptsias, C., Pavlidou, E. et al. Flame-retarded hydrophobic cellulose through impregnation with aqueous solutions and supercritical CO2 . J Therm Anal Calorim 111, 475–482 (2013). https://doi.org/10.1007/s10973-012-2473-5

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  • DOI: https://doi.org/10.1007/s10973-012-2473-5

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