Functionalized magnesium hydroxide (MDH@Fe-PDA) by polydopamine (PDA) and iron chloride (FeCl₃) were designed by one-pot method, aiming at improving flame retardancy and reducing smoke release of epoxy resin. The structure of MDH@Fe-PDA was confirmed via Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). MDH and MDH@Fe-PDA with different ratio were introduced into epoxy resin (EP) as flame retardant additives. The enhanced flame retardancy and smoke suppression of EP composites were evaluated by limiting oxygen index (LOI), UL-94 test and cone calorimetry. The resultant EP composites exhibited remarkably reduced flammability, reflected by high LOI value of 29.3%, V-0 rating, as well as a 57% reduction of peak heat release rate for 7 wt% MDH@Fe-PDA loading. In addition, EP/MDH/MDH@Fe-PDA composites decreased the evolution of volatiles significantly. The char structure of EP composites revealed that char with a more intact and continuous structure. A probable mechanism was proposed which involved catalytic charring behavior at the interface and intensive protection by char and strong radical scavenging activity. Notably, this work provided an attractive method to organo-modified MDH, and enriched its practical applications of MDH as functional fillers to polymers.

聚多巴胺（PDA）和氯化铁（FeCl ₃）官能化的氢氧化镁（MDH @ Fe-PDA））是通过一锅法设计的，旨在提高阻燃性并减少环氧树脂的烟雾释放。MDH @ Fe-PDA的结构通过傅立叶变换红外光谱（FTIR），X射线衍射（XRD）和X射线光电子能谱（XPS）得以确认。将比例不同的MDH和MDH @ Fe-PDA作为阻燃添加剂引入环氧树脂（EP）中。通过极限氧指数（LOI），UL-94测试和锥形量热法评估了EP复合材料增强的阻燃性和抑烟性。所得的EP复合材料显示出显着降低的可燃性，这体现在29.3％的高LOI值，V-0额定值，以及在7 wt％的MDH @ Fe-PDA负载下峰值放热速率降低了57％。此外，EP / MDH / MDH @ Fe-PDA复合材料显着降低了挥发物的释放。EP复合材料的炭结构表明炭具有更完整和连续的结构。提出了一种可能的机制，该机制涉及界面处的催化炭化行为以及炭的强烈保护和强自由基清除活性。值得注意的是，这项工作为有机改性的MDH提供了一种有吸引力的方法，并丰富了MDH作为聚合物功能填料的实际应用。