Covalent functionalization of cellulose in cotton and a nylon-cotton blend with phytic acid for flame retardant properties
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A new and versatile method to covalently functionalize cellulose in cotton and Nylon/cotton (Nyco) blends with plant-based renewable material, phytic acid to impart flame retardant characteristics that is durable is presented. This involves functionalization of 1,1′-carbonyldiimidazole to the cellulose structure of cotton followed by the attachment of diamine and phytic acid through carbamate bonds. In the vertical flame test, phytic acid functionalized cotton and Nyco fabrics exhibit self-extinguishing behavior, whereas control samples burned completely. Pyrolysis combustion flow calorimetry confirmed that phytic acid functionalized cotton and Nyco fabrics showed a reduction in the heat release capacity and the total heat release. In this short communication, we present synthesis, chemical characterization using Fourier transform infrared spectroscopy and Scanning electron spectroscopy, Energy dispersive spectroscopy and study of thermal and flame retardant properties using thermogravimetric analysis, Pyrolysis combustion flow calorimetry and Vertical flame test of phytic acid functionalized cotton and Nyco fabrics.
KeywordsFlame retardant Cotton Nylon-cotton Nyco Phytic acid Surface-functionalization
Financial Support from US Army CCDC Soldier Center is gratefully acknowledged. Approved for public release (PAO#: U19-990).
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