Bio‐based epoxy/polyaniline nanofiber‐carbon dot nanocomposites as advanced anticorrosive materials

Abstract

Application of anticorrosive coating on metal surface enhances the durability of the metal. Anticorrosion can be achieved by the incorporation of conducting nanomaterials like polyaniline or its nanohybrid to a coating material. Thus, bio‐based epoxy nanocomposites were fabricated by the in situ method using polyaniline nanofiber‐carbon dot nanohybrid (0.50 and 1 wt % with respect to epoxy), as the anticorrosive material. The epoxy resin was obtained by polycondensation of bisphenol‐A, sorbitol, and monoglyceride of castor oil (mole ratio of 16:3:1), as hydroxyl compounds with epichlorohydrin (1:3 equivalent, hydroxyl:epichlorohydrin). The morphological analyses of the nanocomposites revealed the uniform dispersion and good compatibility of the nanohybrid in the epoxy matrix. The thermosets demonstrated good tensile strength (30 MPa), elongation at break (45%), scratch resistance (>10 kg) and impact resistance (14.75 kJ/m), good thermal stability (above 250°C), and chemical resistance. The anticorrosion study of the nanocomposites showed excellent corrosion protection efficiency (corrosion rate: 5.68 × 10−3 mils per year) in 3.5 wt % NaCl compared to the pristine epoxy system. Therefore, this bio‐based thermosetting epoxy nanocomposite was demonstrated as efficient anticorrosive material. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47744.

Bio Epoxy Coatings: An Emergent Green Anticorrosive Coating for the Future

“…[82] Figure 8 showed the modified epoxy resin coatings immersed in 5% HCl and it was found that amine-cured systems exhibited better resistance to diluted bases, whereas anhydride-cured systems displayed better resistance to diluted acids. Saikia et al [83] prepared anticorrosive bio-based epoxy nanocomposites composed of polyaniline nanofiber (PN)-carbon dot (CD) nanohybrid (PC). They evaluated the chemical resistance of films in acidic, basic, and salty chemical environments via weight loss method.…”

“…Saikia et al. [ 83 ] prepared anticorrosive bio‐based epoxy nanocomposites composed of polyaniline nanofiber (PN)‐carbon dot (CD) nanohybrid (PC). They evaluated the chemical resistance of films in acidic, basic, and salty chemical environments via weight loss method.…”

“…Saikia et al. [ 83 ] studied the thermal stability of nanocomposites using thermogravimetric analysis. It is observed that the addition of polyaniline Nanofiber‐Carbon dot loading to epoxy thermoset increased the thermal stability.…”

Self-assembly in biobased nanocomposites for multifunctionality and improved performance

“…Diverse nanoparticle identities have been demonstrated for anticorrosion, lling the interstitial spaces of the polymer insulator and preventing ion penetration at the coating-metal interface. A variety of nanoparticles including Fe 3 O 4 , 123 ZnO, 124 clay, 125,126 silica, 109 and carbon nanotubes [127][128][129] have been utilized for anticorrosive applications. In addition, nanoparticles have been widely reported in the introduction of antibacterial activity.…”

Preparation of Tung Oil‐Loaded PU/PANI Microcapsules and Synergetic Anti‐Corrosion Properties of Self‐Healing Epoxy Coatings

“…[ 33,34 ] PANI can improve the anti‐corrosion ability of the coating, and provide the coating with a unique scratch resistance, which can solve the problem of pitting corrosion of traditional anti‐corrosion coatings. [ 35–37 ] Our idea was to prepare tung oil‐loaded PU/PANI microcapsules. Through the synergistic action of tung oil and PANI, the polymer coating shown an excellent self‐healing and corrosion protection property to the metal.…”