Journal
CARBOHYDRATE POLYMERS
Volume 87, Issue 1, Pages 627-635Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2011.08.036
Keywords
Cotton; Sol-gel processes; Alkoxysilanes; Thermal stability; Flame retardancy; Combustion behaviour
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Sol-gel treatments have been performed on cotton fabrics in order to promote the formation of a surface silica insulating barrier, able to enhance their thermo-oxidative stability and flame retardancy. In particular, the role of several silica precursors, which differ as far as their structure (number and type of hydrolysable groups, presence of aromatic rings) is concerned, has been thoroughly investigated. The level of silica distribution and dispersion on and within the fabrics was found to depend on the type of precursor employed, as revealed by scanning electron microscopy and elemental analysis. All the precursors were able to favour the char formation in air below 360 degrees C, as stated by thermogravimetric analysis: in particular, the highest thermal stability was achieved in the presence of precursors bearing aromatic rings. Indeed, both flammability resistance and combustion behaviour of the treated fabrics were remarkably enhanced. (C) 2011 Elsevier Ltd. All rights reserved.
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