Layer-by-Layer Assembly of Halogen-Free Polymeric Materials on Nylon/Cotton Blend for Flame Retardant Applications
MASSACHUSETTS UNIV LOWELL
Pagination or Media Count:
Thin films of environmentally safe, halogen free, anionic sodium phosphate and cationic polysiloxanes were deposited on a Nyco 11 nyloncotton 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.
- Miscellaneous Materials