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

    Year: 2019

    Journal: ACS Omega, Volume 4, JUL, page 12028–12035

    Authors: Jordanov, Igor; Stevens, Daniel L.; Tarbuk, Anita; Magovac, Eva; Bischof, Sandra; Grunlan, Jaime C.

    Organizations: Fulbright Visiting Scholar Program at the U.S. Department of State [E0581973]

    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 zeta-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-to-treat synthetic fibers like polyamide.
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