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    The use of model cellulose gel beads to clarify flame-retardant characteristics of layer-by-layer nanocoatings

    Year: 2021

    Journal: Carbohydr. Polym., Volume 255, MAR 1

    Authors: Koklukaya, Oruc; Karlsson, Rose-Marie Pernilla; Carosio, Federico; Wagberg, Lars

    Organizations: SSF (The Swedish Foundation for Strategic Research); Wallenberg Wood Science Centre

    Keywords: Layer-by-Layer assembly; Flame-retardant; Thermal stability; Cellulose gel beads

    Layer-by-Layer (LbL) assembled nanocoatings are exploited to impart flame-retardant properties to cellulosic substrates. A model cellulose material can make it possible to investigate an optimal bilayer (BL) range for the deposition of coating while elucidating the main flame-retardant action thus allowing for an efficient design of optimized LbL formulations. Model cellulose gel beads were prepared by dissolving cellulose-rich fibers followed by precipitation. The beads were LbL-treated with chitosan (CH) and sodium hexametaphosphate (SHMP). The char forming properties were studied using thermal gravimetric analysis. The coating increased the char yield in nitrogen to up to 29 % and showed a distinct pattern of micro intumescent behavior upon heating. An optimal range of 10-20 BL is observed. The well-defined model cellulose gel beads hence introduce a new scientific route both to clarify the fundamental effects of different film components and to optimize the composition of the films.
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