Hybrid Antibacterial and Electro-Conductive Coating for Textiles Based on Cationic Conjugated Polymer

Abstract

<jats:p>The development of efficient synthetic strategies for incorporating antibacterial coatings into textiles for pharma and medical applications is of great interest. This paper describes the preparation of functional nonwoven fabrics coated with polyaniline (PANI) via in situ polymerization of aniline in aqueous solution. The effect of three different monomer concentrations on the level of polyaniline coating on the fibers comprising the fabrics, and its electrical resistivities and antibacterial attributes, were studied. Experimental results indicated that weight gains of 0.7 and 3.0 mg/cm2 of PANI were achieved. These levels of coatings led to the reduction of both volume and surface resistivities by several orders of magnitude for PANI-coated polyester-viscose fabrics, i.e., from 108 to 105 (Ω/cm) and from 109 to 105 Ω/square, respectively. Fourier Transform Infrared (FTIR) Spectroscopy and Scanning Electron Microscopy (SEM) confirmed the incorporation of PANI coating with an average thickness of 0.4–1.5 µm, while Thermogravimetric Analysis (TGA) demonstrated the preservation of the thermal stability of the pristine fabrics. The unique molecular structure of PANI, consisting of quaternary ammonium ions under acidic conditions, yielded an antibacterial effect in the modified fabrics. The results revealed that all types of PANI-coated fabrics totally killed S. aureus bacteria, while PANI-coated viscose fabrics also demonstrated 100% elimination of S. epidermidis bacteria. In addition, PANI-coated, PET-viscose and PET fabrics showed 2.5 log and 5.5 log reductions against S. epidermidis, respectively.</jats:p>

Highly Durable Antibacterial Textiles: Cross-Linked Protonated Polyaniline-Polyacrylic Acid with Prolonged Electrical Stability

“…As the protonating dopant leached out over time, the textile’s surface inhibited the growth of several bacterial isolates. These findings were consistent with numerous reports on PANI’s antibacterial properties. − The decline in antibacterial effectiveness over time can be attributed to excessive leaching of the dopant. The transformation from green to blue after incubation hinted at the deprotonation of PANI.…”

Surface modification of PE/PET by two-step method with graphene and silver nanoparticles for enhanced electrical conductivity

“…Thermal stability of the samples was measured by Thermogravimetric Analysis (TGA, model: TGA 4000, Perkinelmer Co., Ltd., USA) [39,40]. All of the TGA was conducted with the following conditions: nitrogen gas at a flow rate of 20 mL/min, and measurement temperature ranging from 30 to 750°C with a heating rate of 15°C/min.…”

“…USA) [39,40]. All of the TGA was conducted with the following conditions: nitrogen gas at a flow rate of 20 mL/min, and measurement temperature ranging from 30 to 750 C with a heating rate of 15 C/min.…”

Recent Advances in Antibacterial Composite Coatings

“…Enhanced effects have been obtained when using electroconductive polymers as coatings for different fabrics. The multifunctional material comprised of poly(aniline) deposited on polyester-viscose fabrics not only exhibits antimicrobial activity under acidic conditions against S. aureus and S. epidermidis bacteria, but also registers resistivities up to 10 5 (Ω/cm) [48].…”