Version 2 2024-01-24, 17:04Version 2 2024-01-24, 17:04
Version 1 2024-01-23, 10:30Version 1 2024-01-23, 10:30
journal contribution
posted on 2024-01-24, 17:04authored byHong Chan Lee, Shichoon Lee
Cotton fabric with
improved flame retardancy was prepared by introducing
a zinc phosphate compound into cotton fabric using a layer-by-layer
(LBL) deposition method with poly(acrylic acid) as a polymer electrolyte
layer. In a vertical burning (VB) test, it was found that the flame
retardancy improved as the number of depositions increased. As a result
of thermogravimetric and inductively coupled plasma-atomic emission
spectroscopy analyses, the residual amount increased to 20 wt % for
the 20 deposited sample, and the weight ratio of Zn and P elements
reached more than 40 wt %. As a result of SEM analysis, the cotton
fibers not treated with LBL were destroyed after the VB test, but
the shape of the fabric was maintained in the LBL-treated cotton fabrics.
It was observed by TEM that numerous single crystals of about 10 nm
formed on the surface of the sample subjected to the VB test. Through
FT-IR and XPS analyses, it was confirmed that the zinc phosphate compound
layer was formed by LBL deposition by the reaction between the phosphate
anion and zinc cation. XRD analysis confirmed that the orthorhombic
hopeite crystals produced by LBL deposition were transformed into
zinc phosphate Zn3(PO4)2 crystals
by flame during the VB test. These results show that flame retardancy
was improved by a mechanism in which a noncombustible zinc phosphate
barrier was formed during firing. These results are significant in
suggesting a new method for preparing zinc phosphate single crystals
of about 10 nm in size and providing anticorrosion coating for cotton
fabric by an environmentally friendly LBL method.