PLA (Polylactic acid) as a bioplastic polymer has limited applications in areas that require high fire safety due to its inherent flammability and dripping when exposed to flames. In this paper, azo-boron-BPA (AZ-A) and polydopamine (PDA) were synthesized, characterized and incorporated into PLA using the solvent approach and hot compression molding. Nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR) and Raman spectra showed that AZ-A and PDA were successfully synthesized. The flame retardant (FR) properties of synergistic AZ-A/PDA were investigated by vertical burning test, limiting oxygen index (LOI), cone calorimeter and thermogravimetric analysis (TGA). TGA analysis showed that synergistic AZ-A/PDA was generally more efficient in reducing the degradation rate of PLA and gave appreciably much higher char residue compared to the individual FR components. The synergistic AZ-A/PDA achieved V-0 rating with LOI value of 23.7% at 10 wt% loading in the ratio 1:1 whereas the individual FR components could only give a V-2 rating. The AZ-A/PDA synergy also resulted in an obvious reduction in PHRR (up to 19%) with increased residue (up to 17.7%). This research work will contribute to and expand the frontiers of knowledge in flame retardant azo boron compounds and their synergies for PLA.

由于其固有的易燃性和暴露于火焰中时滴落，PLA（聚乳酸）作为一种生物塑料聚合物在要求高防火安全性的领域中应用有限。本文采用溶剂法和热压成型法合成了偶氮-硼-双酚A（AZ-A）和聚多巴胺（PDA），并将其掺入PLA中。核磁共振（NMR），傅立叶变换红外光谱（FTIR）和拉曼光谱表明成功合成了AZ-A和PDA。通过垂直燃烧试验，极限氧指数（LOI），锥形量热仪和热重分析（TGA）研究了协同AZ-A / PDA的阻燃性能。TGA分析表明，与单独的FR组分相比，协同作用的AZ-A / PDA通常在降低PLA降解速率方面更为有效，并且炭渣残留量明显更高。增效剂AZ-A / PDA在比例为1：1的10 wt％的情况下，LOI值为23.7％，达到了V-0等级，而单个FR组分只能给出V-2等级。AZ-A / PDA的协同作用还导致PHRR明显降低（最高19％），残留物增加（最高17.7％）。这项研究工作将有助于并扩大阻燃性偶氮硼化合物及其对PLA的协同作用的知识前沿。AZ-A / PDA的协同作用还导致PHRR明显降低（最高19％），残留物增加（最高17.7％）。这项研究工作将有助于并扩大阻燃性偶氮硼化合物及其对PLA的协同作用的知识前沿。AZ-A / PDA的协同作用还导致PHRR明显降低（最高19％），残留物增加（最高17.7％）。这项研究工作将有助于并扩大阻燃性偶氮硼化合物及其对PLA的协同作用的知识前沿。