Chemical synthesis and characterization of dodecylbenzene sulfonic acid-doped polyaniline/viscose fiber

Abstract

A dodecylbenzene sulfonic acid (DBSA) doped-polyaniline (PANI) coated conductive viscose fiber (VCF) was prepared by chemical oxidation polymerization in an ethanol/water solution. Fourier transform infrared spectra (FTIR) and XPS proved that an interaction between PANI and VCF formed in the PANI/VCF composites. The mild treatment did not result in the oxidation and degradation of VCF detected by thermal gravimetric analysis (TGA) and mechanical testing. Moreover, the influence of the reaction conditions including reaction time, aniline monomer (ANI) concentration, ammonium persulfate (APS) concentration and DBSA concentration on the morphology and the conductivity of the PANI/VCF composites were investigated in detail. The orthogonal experiments were designed to determine the optimal reaction conditions as follows: ethanol/water ratio (30/70), reaction time (18 h), ANI concentration (0.1 mol L À1 ), APS concentration (0.125 mol L À1 ) and DBSA concentration (0.1 mol L À1 ).When the PANI/VCF composite was washed 40 times in water, the conductivity still remained at 2.5 Â 10 À2 S cm À1 , and this value was stable for more washing.

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

“…Based on the SEM images, the estimated average coating thickness was between 0.4 and 1.5 µm. These results are in line with data reported in similar studies [71,[92][93][94]. However, several differences can be discerned between the three PANI concentrations.…”

“…In general, the results of the thermogravimetric analysis ( Figure 5) are in line with those reported in the literature [93][94][95][96][97]. The thermal decomposition of the unmodified and PANI-coated PET began at around 350 °C and ended at 450 °C.…”

“…However, several differences can be discerned between the three PANI concentrations. When coating the fabrics with 44 mM of PANI, a nonuniform coating layer was obtained, with a low grainsize compared to the other concentrations [93,94]. When the concentration increased to 85 mM, a more uniform and continuous coating was obtained, both on PET and viscose fabrics.…”

“…viscose polymer chains [93]. However, the Tmax (the temperature where the maximum weight loss took place; in this case, it corresponds to the fabric itself) in the coated fabric was equal to those of viscose fabrics, which may indicate that the treatment did not cause any damage to the material.…”

“…A comparison of 50:50 PET:viscose fabric with the other fabrics showed that, for the most part, the 50:50 PET:viscose coated fabric was quite similar to viscose fabrics, albeit with slightly lower thermal stability due to the effects of the less stable PET fraction. Thermal decomposition of the unmodified viscose fabric began at around 230 • C and ended at 330 • C, while for PANI-coated fabrics, it ended at 325 • C (37% weight loss), which was attributed to the destruction of the crystalline structures of the viscose [94] and its amorphous region degradation into D-glucopyranose monomers [91,93,94]. The rest of the coated fabric degradation ended at 548 • C (35% weight loss); this was attributed to the presence of polyaniline emeraldine salt polymer-chains [93,94].…”