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Layer-by-layer assembly of efficient flame retardant coatings based on high aspect ratio graphene oxide and chitosan capable of preventing ignition of PU foam
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2018-03-19
Lorenza Maddalena, Federico Carosio, Julio Gomez, Guido Saracco, Alberto Fina

The layer-by-layer (LbL) technique is adopted for the construction of multilayers encompassing chitosan and graphene oxide (GO) platelets capable of improving the flame retardant properties open cell PU foams. The LbL assembly follows a linear growth regime as evaluated by infrared spectroscopy and yields a multilayer structure where GO platelets are embedded within a chitosan continuous matrix. 3 and 6 bi-layers (BL) can efficiently coat the complex 3D structure of the foam and substantially improve its flame retardant properties. 3BL only add 10% to the original mass and can suppress the melt dripping during flammability and reduce both the peak of heat release rate by 54% and the total smoke released by 59% in forced combustion tests. Unprecedented among other LbL assemblies employed for FR purposes, the deposition 6BL is capable of slowing down the release of combustible volatile to the limits of non-ignitability thus preventing ignition in half of the specimens during cone calorimetry tests. This has been ascribed to the formation of a protective coating where the thermally stable char produced by chitosan serves as a continuous matrix embedding GO platelets, which control volatile release while mechanically sustaining the PU foam structure.



中文翻译:

基于高纵横比氧化石墨烯和脱乙酰壳多糖的高效阻燃涂料的逐层组装,可防止PU泡沫着火

采用逐层(LbL)技术构建包含壳聚糖和氧化石墨烯(GO)血小板的多层结构,能够改善开孔PU泡沫的阻燃性能。LbL组件遵循红外光谱法评估的线性生长机制,并产生多层结构,其中GO血小板嵌入壳聚糖连续基质中。3层和6层双层(BL)可以有效地覆盖泡沫的复杂3D结构,并显着提高其阻燃性。3BL仅增加了10%的原始质量,并且在可燃性过程中可以抑制熔体滴落,并且在强制燃烧测试中,既可以将放热率的峰值降低54%,又可以将总烟气排放降低59%。在用于FR的其他LbL组件中空前,沉积物6BL能够将可燃挥发物的释放减慢到不可燃的极限,从而防止了在锥形量热测试中一半样品的着火。这归因于保护涂层的形成,其中由壳聚糖产生的热稳定炭用作嵌入GO血小板的连续基质,该血小板控制挥发物释放,同时机械上维持PU泡沫结构。

更新日期:2018-03-20
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