LBL generated fire retardant nanocomposites on cotton fabric using cationized starch-clay-nanoparticles matrix. (15th November 2021)

• Record Type: Journal Article
• Authors: Ur Rehman, Zeeshan; Huh, Seok-Hwan; Ullah, Zakir; Pan, Ye-Tang; Churchill, David G.; Koo, Bon Heun
• Is Part Of: Carbohydrate polymers. Volume 274(2021)
• Publication Date: 2021-11-15
• Subjects: Fire retardant -- Nanoparticle -- Ammonium centers -- Pyrolysis TiO2 -- Vermiculite -- Cotton -- Ionization; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2021.118626
• Languages: English
• ISSNs: 0144-8617

Abstract

Abstract: In this work, starch–clay–TiO2 -based nanocomposites were deposited on cotton fabric through layer-by-layer (LBL) process and their effect on the flame retardancy, inhibition of pyrolysis and combustion processes were discussed in details. Polyelectrolyte solutions/suspensions of cationized starch and VMT (vermiculite)/TiO2 nanoparticles were used to deposit these nanocomposites in the form of multi-layered coatings (5, 7, 10 and 15 bilayers). Uniform fabric coverage and presence of electrolytes was imaged by scanning electron microcopy (LV-SEM), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and EDX characterizations. The greatest pyrolysis reduction was found for the StVT-7 sample (7 bilayers); ~30% and 21%, based on microscale combustion calorimetry (MCC) and thermogravimetric analysis (TGA). When using MCC, the improved values of the PHRR ~ 193 W/g, THR ~ 10.7 kJ/g), HRC ~ 390 J/g∙K and LOI ~ 22.2% were found for the StVT-7 sample which was strongly supported by the UL-94 test. Graphical abstract: Targeted inhibition mechanism of pyrolysis and combustion process. Unlabelled Image Highlights: Cationized starch and VMT/TiO2 based LBL coatings were deposited on cotton. Significant decrease in the THR, PHRR and mass residue was obtained for 7 bilayers. Using flame test, time of ignition and flame spread was retarded for 7 bilayers. Selective deposition and lesser intake of anionic species observed for more than 7 bilayers.