Cellulose ( IF 4.9 ) Pub Date : 2021-08-08 , DOI: 10.1007/s10570-021-04127-8 Jian Liu 1 , Zheng Zhang 1 , Dezheng Kong 1 , Shuai Wang 1 , Zhou Lu 1 , Ling Sun 2 , Chaohong Dong 2
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A synergistic flame retardant (silicon, phosphorus and nitrogen) based on cyclic polysiloxane, ammonium salt of tetramethylcyclosiloxyl-piperazin-phosphinic acid (APCTSi) was successfully prepared and firmly bonded to cotton fabric through a chemical grafting method. The chemical structure of APCTSi was characterized by Fourier transform infrared (FTIR) spectroscopy, 1H and 31P nuclear magnetic resonance (1H NMR and 31P NMR). The scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM–EDX) proved that APCTSi successfully adhered to the surface of cotton fabric and the elements on the surface of cotton fabric were evenly distributed. The flame retardant properties were characterized by limiting oxygen index (LOI), vertical burning test, thermogravimetric (TG) analysis and TG-FTIR. The limiting oxygen index (LOI) can reach 30.9% with a char length of 8.7 cm for the weight gain of APCTSi was 16.2%. The combustion behavior was characterized by cone calorimetry test. The peak heat release rate (pHRR) and total heat release (THR) values of treated cotton fabric decreased by 30% and 48% respectively compared to that of pure cotton fabric. All the results proved that the cotton fabric treated by APCTSi had the flame retardant effect of condensed phase (forming stable char layer) and gas phase (releasing nonflammable gases).
Graphic abstract
中文翻译：
新型环聚硅氧烷协同阻燃剂的合成及其棉织物阻燃涂层
成功制备了一种基于环状聚硅氧烷、四甲基环甲硅烷氧基哌嗪次膦酸铵盐（APCTSi）的协同阻燃剂（硅、磷和氮），并通过化学接枝方法与棉织物牢固结合。APCTSi 的化学结构通过傅里叶变换红外 (FTIR) 光谱、1 H 和31 P 核磁共振（1 H NMR 和31核磁共振）。扫描电子显微镜结合能量色散 X 射线光谱 (SEM-EDX) 证明 APCTSi 成功粘附在棉织物表面，并且棉织物表面的元素分布均匀。阻燃性能通过极限氧指数(LOI)、垂直燃烧试验、热重(TG)分析和TG-FTIR表征。极限氧指数（LOI）可以达到 30.9%，炭长为 8.7 cm，APCTSi 的增重为 16.2%。燃烧行为通过锥形量热试验表征。与纯棉织物相比，经处理的棉织物的峰值热释放率（pHRR）和总热释放（THR）值分别降低了30%和48%。
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