Layer-by-Layer Assembly of Halogen-Free Polymeric Materials on Nylon/Cotton Blend for Flame Retardant Applications

Thin films of environmentally safe, halogen free, anionic sodium phosphate and cationic polysiloxanes were deposited on a Nyco (1:1 nylon/cotton blend) fabric via layer-by-layer (LbL) assembly to reduce the inherent flammability of Nyco fabric. In the coating process, we used three different polysil...

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Bibliographic Details
Main Authors: Narkhede, Mahesh, Thota, Sammaiah, Mosurkal, Ravi, Muller, Wayne S, Kumar, Jayant
Format: Report
Language:English
Subjects:
COTTON
FABRICS
FIBERS
FIRE RESISTANT MATERIALS
FLAMMABILITY
Miscellaneous Materials
NYLON
PHOSPHATES
REPRINTS
SCANNING ELECTRON MICROSCOPY
SILOXANES
THERMOGRAVIMETRIC ANALYSIS
WATER SOLUBLE MATERIALS
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Summary:Thin films of environmentally safe, halogen free, anionic sodium phosphate and cationic polysiloxanes were deposited on a Nyco (1:1 nylon/cotton blend) fabric via layer-by-layer (LbL) assembly to reduce the inherent flammability of Nyco fabric. In the coating process, we used three different polysiloxane materials containing different amine groups including 35-45% (trimethylammoniummethylphenythyl)-methyl siloxane-55-65% dimethyl siloxane copolymer chloride salt (QMS-435), aminoethylaminopropyl silsesquioxane-methylsilsesquioxane copolymer oligomer (WSA-7021) and aminopropyl silesquioxane oligomers (WSA-991) as a positive polyelectrolyte. Thermo-gravimetric analysis showed that coated fabric has a char yield around 40% at 600 degrees C whereas control fabric is completely consumed. The vertical flame test (VFT) on the LbL-coated Nyco fabric was passed after a flame time of 2 s, with a char length of 3.81 cm. Volatile and nontoxic degradation products of flame retardant-coated fabric were analyzed by pyrolysis gas chromatography mass spectroscopy (Py-GCMS). Surface morphology of coated fabrics and burned fabric residues were studied by scanning electron microscopy. The original document contains color images. Published in Fire and Materials, 2014.