The incorporation of polysilicic acid into the structure of a cellulosic fibre enhances the fire resistance of the hybrid by two distinct mechanisms. One is the formation on the fibre surface of an inherently incombustible char, and the other is a lowering of thetemperature at which water is released from the fibre. This paper examines the mechanismsin question.
The formation of polyaluminosiloxane networks through surface modification of cellulose-polysilicic acid hybrid fibres with inorganic aluminium compounds enhances flame retardancy and laundry performance of these fibres. Fibres of cellulose-polysilicic acid (VISIL) have been reported as a flame retardant. In contrast to their thermal property, these fibres undergo a significant change, in terms of flame retardancy, when subjected to alkaline conditions (pH > 10). Surface modification of these fibres with inorganic aluminium compounds not only reduces the solubility behaviour but also increases the flame retardancy.
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