Effect of Plasma Pretreatment on Flame Retardant Modification of Ramie Fabric via Layer-by-layer Assembly

ABSTRACT

Polyethylenimine/ammonium polyphosphate (PEI/APP) flame retardant coatings were constructed via layer-by-layer (LbL) assembly method on the surface of ramie fabric treated by plasma pretreatment. The conditions of plasma pretreatment were analyzed according to weight gain rate and the residual char at 600°C in the nitrogen atmosphere of PEI/APP-coated ramie fabric, and the optimum conditions of plasma pretreatment were obtained. Attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) was used to confirm the effect of plasma pretreatment on PEI/APP flame retardant coating constructed on the surface of ramie fabric by LbL assembly. Flame retardancy of PEI/APP-coated ramie fabrics were analyzed by LOI and UL94 vertical burning tests. These results revealed that PEI/APP-coated ramie fabrics treated by plasma pretreatment exhibited good self-extinguishing and high fire safety. Meanwhile, the treated ramie fabrics still maintained good whiteness and mechanical properties, and plasma pretreatment also was beneficial to improve durability to washing of PEI/APP-coated ramie fabric. These findings have highly significant implications for the application of plasma pretreatment to flame retardant modification of ramie fabric used by LbL assembly.

摘要

采用逐层 (LbL) 组装法, 在经等离子体预处理的苎麻织物表面制备了聚乙烯亚胺/聚磷酸铵 (PEI/APP) 阻燃涂料. 根据PEI/APP涂层苎麻织物的增重率和600°C氮气气氛下的残炭, 对等离子体预处理条件进行了分析, 得出了等离子体预处理的最佳条件. 采用衰减全反射傅里叶变换红外光谱 (ATR-FTIR) 研究了等离子体预处理对苎麻织物表面LbL组装PEI/APP阻燃涂层的影响. 通过LOI和UL94垂直燃烧试验, 分析了PEI/APP涂层苎麻织物的阻燃性能. 结果表明, 经等离子体预处理的PEI/APP涂层苎麻织物具有良好的自熄性能和较高的防火安全性. 同时, 处理后的苎麻织物仍保持良好的白度和力学性能, 等离子体预处理也有利于提高PEI/APP涂层苎麻织物的耐洗性. 这些发现对等离子体预处理在LbL组装用苎麻织物阻燃改性中的应用具有重要意义.

KEYWORDS:

• Ramie fabrics
• plasma pretreatment
• optimization
• flame retardancy
• layer-by-layer assembly
• durability to washing

关键词:

• 苎麻织物
• 等离子体预处理
• 优化
• 阻燃性
• 逐层组装
• 耐洗

Acknowledgments

This work was financially supported by National Natural Science Foundation of China (no. 51991355), Zhejiang Provincial Natural Science Foundation of China (no. LY19E030004), and Natural Science Foundation of Ningbo (no. 2019A610144 and 202003N4309).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [51991355], Natural Science Foundation of Ningbo [2019A610144,202003N4309], and Zhejiang Provincial Natural Science Foundation of China [LY19E030004].