engleski

Enzymatic Modification of Polyamide for Improving the Conductivity of Water-Based Multilayer Nanocoatings

Enzymatic modification, using a protease from Bacillus licheniformis (Subtilisin A), was carried out on polyamide 6.6 (PA6.6) fabric to make it more amenable to water-based nanocoatings used to impart electrical conductivity. The modified PA6.6 fibers exhibit a smoother surface, increased hydrophilicity due to more carboxyl and amino groups, and larger ζ-potential relative to unmodified polyamide. With its improved hydrophilicity and surface functionality, the modified textile is better able to accept a water-based nanocoating, composed of multiwalled carbon nanotubes (MWCNT) stabilized by sodium deoxycholate (DOC) and poly(diallyldimethylammonium chloride) (PDDA), deposited via layer-by layer assembly. Relative to unmodified fabric, the enzymatically modified fibers exhibit lower sheet resistance as a function of PDDA/MWCNT DOC bilayers deposited. This relatively green technique could be used to impart a variety of useful functionalities to otherwise difficult totreat synthetic fibers like polyamide.

PA6.6, polyamide 6.6 fabric ; LbL, layer-by-layer ; MWCNT, multiwall carbon nanotubes ; DOC, sodium deoxycholate ; PDDA, poly(diallyldimethylammonium chloride) ; CNT, carbon nanotubes ; SEM, scanning electron microscopy ; MB, methylene blue ; AO7, acid orange 7

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