writer：具有低发烟性和抗菌能力的软质聚氨酯泡沫塑料仿生结构生物基阻燃涂层---孟丹
keywords：Bio-based coating，Flexible polyurethane foam，Fire safety，Antibacterial property
source：期刊
Issue time：2022年

Flexible polyurethane foam (FPUF) is widely used in our life, but it is inherent flammable. The demand for environmental-friendly multi-functional FPUF has been increasing rapidly in the last decade. In this work, a novel bio-based flame retardant coating was constructed by chemically reacting sodium alginate (OSA) and polydopamine (PDA) on the FPUF, followed by depositing nanorod-like β-FeOOH molecules through complexation reaction to form a biomimetic structure. The limiting oxygen index of the coated FPUF samples reached 25.5%. The peak heat release rate was reduced by 45.0%, and the smoke density of the coated sample was decreased by 69.1% compared to that of the control FPUF sample. It was proposed that the OSA-PDA-β-FeOOH decomposed during combustion to promote the formation of compact crosslinked char and released inert gases to dilute the combustible gases, and the β-FeOOH transferred to Fe2O3 to settled the smoke particles reducing the smoke release. Furthermore, the coating with shark skin like structure endowed FPUF antibacterial ability because of its good superoleophobicity underwater. This work provided a novel strategy to construct a biomimetic multifunctional coating on the FPUF.

软质聚氨酯泡沫塑料（FPUF）在我们的生活中应用广泛，但它本身就具有易燃性。在过去十年中，对环保型多功能 FPUF 的需求一直在快速增长。在这项工作中，通过在 FPUF 上使海藻酸钠 (OSA) 和聚多巴胺 (PDA) 发生化学反应，然后通过络合反应沉积纳米棒状 β-FeOOH 分子形成仿生结构，构建了一种新型生物基阻燃涂层。涂层FPUF样品的极限氧指数达到25.5%。与对照FPUF样品相比，涂层样品的峰值放热率降低了45.0%，烟气密度降低了69.1%。2 O 3沉降烟雾颗粒，减少烟雾释放。此外，具有鲨鱼皮结构的涂层由于其良好的水下超疏油性而赋予了FPUF抗菌能力。这项工作提供了一种在 FPUF 上构建仿生多功能涂层的新策略。