Additive‐type flame retardants used in polyurethane foams (PUFs) have low compatibility with the matrix and have a large particle size which reduces the mechanical strength. To overcome this, cellulose‐based additive‐type flame retardants were prepared. Microcrystalline cellulose (MCC) was grinded to a suitable size to be applying as a reinforcement for urethane foam. The ground MCC was coated with the mussel‐derived adhesive protein, dopamine, and formed the iron phosphonate coordination network on the surface. It was confirmed that the modification proceeded well by structural analysis by Fourier‐transform infrared spectrometer and morphology analysis by scanning electron microscope. In the synthesis of PUF, expandable graphite (EG) was added to obtain high flame retardancy. The PUF mixed with 3 wt% of ground MCC‐based flame retardant and 12 wt% of EG (GCF3) was found to have an excellent limiting oxygen index (LOI) of 25.3%, while the LOI of pure PUF was 19.3%. In particular, the compressive strength of GCF3 was remarkably enhanced (21 wt%) compared with the PUF containing 15 wt% of EG. This study produced a new additive‐type flame retardant to improve mechanical strength. This provides a simple and comprehensive solution for PUF applications requiring high flame retardancy and mechanical strength.

中文翻译：

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含膦酸多巴胺涂层纤维素的可膨胀石墨/聚氨酯泡沫复合材料的阻燃性和机械性能

聚氨酯泡沫（PUF）中使用的添加剂型阻燃剂与基质的相容性低，且粒径较大，从而降低了机械强度。为了克服这个问题，制备了纤维素基添加剂型阻燃剂。将微晶纤维素（MCC）研磨至合适的尺寸，以用作聚氨酯泡沫的增强材料。磨碎的MCC涂有贻贝衍生的粘附蛋白多巴胺，并在表面形成了膦酸铁配位网络。通过傅立叶变换红外光谱仪的结构分析和扫描电子显微镜的形态分析，证实了修饰进行得很好。在PUF的合成中，添加可膨胀石墨（EG）以获得高阻燃性。发现PUF与3 wt％的基于MCC的阻燃剂和12 wt％的EG（GCF3）混合时具有25.3％的极佳极限氧指数（LOI），而纯PUF的LOI为19.3％。特别地，与包含15重量％的EG的PUF相比，GCF3的压缩强度显着提高（21重量％）。这项研究生产了一种新型的添加剂型阻燃剂，以提高机械强度。这为需要高阻燃性和机械强度的PUF应用提供了简单而全面的解决方案。这项研究生产了一种新型的添加剂型阻燃剂，以提高机械强度。这为需要高阻燃性和机械强度的PUF应用提供了简单而全面的解决方案。这项研究生产了一种新型的添加剂型阻燃剂，以提高机械强度。这为需要高阻燃性和机械强度的PUF应用提供了简单而全面的解决方案。