School of Emergency Management, Jiangsu University, Zhenjiang 212013, China.
Zhejiang Jiamin New Materials Co., Ltd., Jiaxing 314027, China.
Molecules. 2023 Jan 7;28(2):623. doi: 10.3390/molecules28020623.
To improve the compatibility between flame retardant and epoxy resin (EP) matrix, amino phenyl copper phosphate-9, 10-dihydro-9-oxygen-10-phospha-phenanthrene-10-oxide (CuPPA-DOPO) is synthesized through surface grafting, which is blended with EP matrix to prepare EP/CuPPA-DOPO composites. The amorphous structure of CuPPA-DOPO is characterized by X-ray diffraction and Fourier-transform infrared spectroscopy. Scanning electron microscope (SEM) images indicate that the agglomeration of hybrids is improved, resisting the intense intermolecular attractions on account of the acting force between CuPPA and DOPO. The results of thermal analysis show that CuPPA-DOPO can promote the premature decomposition of EP and increase the residual amount of EP composites. It is worth mentioning that EP/6 wt% CuPPA-DOPO composites reach UL-94 V-1 level and limiting oxygen index (LOI) of 32.6%. Meanwhile, their peak heat release rate (PHRR), peak smoke production release (PSPR) and CO production (COP) are decreased by 52.5%, 26.1% and 41.4%, respectively, compared with those of EP. The inhibition effect of CuPPA-DOPO on the combustion of EP may be due to the release of phosphorus and ammonia free radicals, as well as the catalytic charring ability of metal oxides and phosphorus phases.
为了提高阻燃剂与环氧树脂（EP）基体的相容性，通过表面接枝合成了氨基苯膦酸-9,10-二氢-9-氧-10-磷杂菲-10-氧化物（CuPPA-DOPO），并将其与 EP 基体共混制备 EP/CuPPA-DOPO 复合材料。X 射线衍射和傅里叶变换红外光谱表明 CuPPA-DOPO 具有无定形结构。扫描电子显微镜（SEM）图像表明，由于 CuPPA 和 DOPO 之间的作用力，杂化物的团聚得到改善，抵抗了强烈的分子间吸引力。热分析结果表明，CuPPA-DOPO 可以促进 EP 的早期分解，并增加 EP 复合材料的残余量。值得一提的是，EP/6wt%CuPPA-DOPO 复合材料达到 UL-94 V-1 级和 32.6%的极限氧指数（LOI）。同时，与 EP 相比，其峰值热释放速率（PHRR）、峰值烟雾释放（PSPR）和 CO 生成（COP）分别降低了 52.5%、26.1%和 41.4%。CuPPA-DOPO 对 EP 燃烧的抑制作用可能归因于磷和氨自由基的释放，以及金属氧化物和磷相的催化成炭能力。
