Abstract The layer by layer (LBL) deposition of chitosan/melamine/urea (CS/ME/UREA) and phytic acid (PA) onto the acrylic acid (AA) grafted Polyamide 6.6 (PA6.6) fabrics including a pad-dry-cure treatment with chitosan/graphene oxide (CS/GO) nanocomposites were considered to improve the hydrophilicity and durable flame retardancy. Obtained results indicated that these hybrid coatings could significantly improve the flame retardancy as the limiting oxygen index (LOI) value reached up to 25 % from 18.5 % and could completely stop the melt dripping where the fabric sample with two bilayers deposition and simultaneously treated with CS/GO nanocomposite (PA6.6-g-AA-2BL-CS/GO) achieved a V-1 rating. A 2BLs deposited hybrid coating (i.e., PA6.6-g-AA-2BL-CS/GO) could decrease the peak heat release rate (pHRR) by 47.1 %; whereas a maximum reduction of pHRR by about 56 % was achieved for 5BLs deposition. Moreover, a considerable improvement in thermal stability and char yield% were also realized in the thermogravimetric analysis (TGA) test. Furthermore, the as-prepared hybrid coatings imparted better hydrophilicity as a 2BLs deposition along with pad-dry-cure treatment by CS/GO could boost up the hydrophilicity of the treated fabrics further compared to the only 2BLs deposited fabric sample. In addition, the application of CS/GO nanocomposite could improve the stability of this coating and able to stop the dripping tendency even after 10 laundering cycles as well.

中文翻译：

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用于对聚酰胺 6.6 织物进行持久阻燃和亲水处理的混合涂层

摘要 壳聚糖/三聚氰胺/尿素 (CS/ME/UREA) 和植酸 (PA) 逐层 (LBL) 沉积到丙烯酸 (AA) 接枝的聚酰胺 6.6 (PA6.6) 织物上，包括轧干-壳聚糖/氧化石墨烯（CS/GO）纳米复合材料的固化处理被认为可以提高亲水性和持久的阻燃性。获得的结果表明，这些混合涂层可以显着提高阻燃性，因为极限氧指数 (LOI) 值从 18.5% 上升到 25%，并且可以完全阻止熔体滴落，其中具有两个双层沉积并同时用 CS 处理的织物样品/GO 纳米复合材料 (PA6.6-g-AA-2BL-CS/GO) 达到 V-1 等级。2BLs 沉积的混合涂层（即 PA6.6-g-AA-2BL-CS/GO）可以将峰值热释放率 (pHRR) 降低 47.1%；而对于 5BLs 沉积，pHRR 最大降低了约 56%。此外，在热重分析 (TGA) 测试中还实现了热稳定性和焦炭产率的显着改善。此外，所制备的混合涂层赋予了更好的亲水性，因为与仅 2BLs 沉积的织物样品相比，2BLs 沉积以及 CS/GO 压干固化处理可以进一步提高处理过的织物的亲水性。此外，CS/GO 纳米复合材料的应用可以提高该涂层的稳定性，即使在 10 次洗涤循环后也能阻止滴落趋势。所制备的混合涂层赋予了更好的亲水性，因为与仅 2BLs 沉积的织物样品相比，2BLs 沉积以及 CS/GO 压干固化处理可以进一步提高处理过的织物的亲水性。此外，CS/GO 纳米复合材料的应用可以提高该涂层的稳定性，即使在 10 次洗涤循环后也能阻止滴落趋势。所制备的混合涂层赋予了更好的亲水性，因为与仅 2BLs 沉积的织物样品相比，2BLs 沉积以及 CS/GO 压干固化处理可以进一步提高处理过的织物的亲水性。此外，CS/GO 纳米复合材料的应用可以提高该涂层的稳定性，即使在 10 次洗涤循环后也能阻止滴落趋势。