Citation: Li-li Wang, Tao Zhang, Hong-qiang Yan, Mao Peng, Zheng-ping Fang, Yan Li, Wang Hao. Flame-retardant Coating by Alternate Assembly of Poly(vinylphosphonic acid) and Polyethylenimine for Ramie Fabrics[J]. Chinese Journal of Polymer Science, ;2014, 32(3): 305-314. doi: 10.1007/s10118-014-1408-y shu

Flame-retardant Coating by Alternate Assembly of Poly(vinylphosphonic acid) and Polyethylenimine for Ramie Fabrics

Li-li Wang ¹ ,
Tao Zhang ¹ ,
Hong-qiang Yan ¹ ,
Mao Peng ^1,, ,
Zheng-ping Fang ¹ ,
Yan Li ¹ ,
Wang Hao ¹

Corresponding author: Mao Peng,
Received Date: 7 May 2013
Revised Date: 14 August 2013

Fund Project: This work was financially supported by the National Basic Research Program of China (Nos. 2010CB631105 and 2011CB612307).

A novel intumescent flame retardant coating, consisting of poly(vinylphosphonic acid) (PVPA) as the acid source and branched polyethylenimine (BPEI) as the blowing agent, was constructed on the surface of ramie fabrics by alternate assembly to remarkably improve the flame retardancy of ramie. The PVPA/BPEI coating on the surface of individual fibers of ramie fabric pyrolyzes to form protective char layer upon heating/burning and improves the flame retardancy of ramie. Thermogravimetric analysis reveals that the PVPA/BPEI-coated ramie fabrics left as much as 25.8 wt% residue at 600℃, while the control (uncoated) fabric left less than 1.4 wt% residue. Vertical flame test shows that all PVPA/BPEI-coated fabrics have shorter after-flame time, and the residues well preserved the original weave structure and fiber morphology, whereas, the uncoated fabric left only ashes. Microscale combustion calorimetry shows that the PVPA/BPEI coatings greatly reduce the total heat release by as much as 66% and the heat release capacity by 76%, relative to those of the uncoated fabric.
- Alternative assembly,
- Poly(vinylphosphonic acid),
- Flame retardant,
- Ramie fabric
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