Department of Fiber and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, SE-100 44 Stockholm, Sweden.
Department of Fiber and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, SE-100 44 Stockholm, Sweden; Wallenberg Wood Science Center, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
Carbohydr Polym. 2021 Mar 1;255:117468. doi: 10.1016/j.carbpol.2020.117468. Epub 2020 Dec 2.
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.
层层（LbL）组装纳米涂层被用于赋予纤维素基质阻燃性能。模型纤维素材料可以研究涂层沉积的最佳双层（BL）范围，同时阐明主要的阻燃作用，从而有效地设计优化的 LbL 配方。通过溶解富含纤维素的纤维然后沉淀来制备模型纤维素凝胶珠。用壳聚糖（CH）和六偏磷酸钠（SHMP）对珠进行层层处理。使用热重分析研究炭形成特性。涂层在氮气中增加炭产率高达 29%，并在加热时表现出明显的微膨胀行为模式。观察到 10-20 BL 的最佳范围。因此，定义明确的模型纤维素凝胶珠为阐明不同薄膜成分的基本作用和优化薄膜组成提供了一条新的科学途径。
