Development of Castor Oil Based Poly(urethane‐esteramide)/TiO₂ Nanocomposites as Anticorrosive and Antimicrobial Coatings

Abstract

Castor oil based polyesteramide (CPEA) resin has been successfully synthesized by the condensation polymerization of N-N-bis (2-hydroxyethyl) castor oil fatty amide (HECA) with terephthalic acid and further modified with different percentages of 7, 9, 11, and 13 wt.% of toluene-2,4-diisocyanate (TDI) to obtain poly(urethane-esteramide) (UCPEA), via addition polymerization. TiO2(0.1, 0.2, 0.3, 0.4, and 0.5 wt%) nanoparticles were dispersed in UCPEA resin. The structural elucidation of HECA, CPEA, and UCPEA has been carried out using FT-IR,1H-NMR, and13C-NMR spectroscopic techniques while physicochemical and physicomechanical properties were investigated by standard methods. Thermal stability and molecular weight of UCPEA have been assessed by thermogravimetric analysis (TGA) and gel permeation chromatography (GPC), respectively. Furthermore, the corrosion behavior of UCPEA coatings on mild steel has been investigated by potentiodynamic polarization measurements in different corrosive environments (3.5 wt% HCl, 5 wt% NaCl, 3.5 wt% NaOH, and tap water) at room temperature and surface analysis by scanning electron microscope (SEM) and energy dispersive X-ray (EDX). The antibacterial activities of the UCPEA were tested against bacteria and fungi by agar disc diffusion method. The results of this study have revealed that UCPEA nanocomposite coatings exhibit good physicomechanical, anticorrosion and antimicrobial properties, which can be safely used up to 200°C.

Biological applications study of bio‐nanocomposites based on chitosan/TiO2 nanoparticles polymeric films modified by oleic acid

“…Additionally, as noted from the TGA curve of Cs/OA film, adding the oleic acid to chitosan caused the thermal decomposition zone to shift to a higher temperature compared to pure chitosan which may be attributed to a decrease in thermal stability by merging the oil and with the incorporation of Cs/TiO 2 NPs lead to a slight increase in the degradation potential and more thermal stability of the nanocomposite film. The oil appears to stabilize the film, but when the temperature is higher than the degradation temperature of the oil, the oil appears to reinforce the opposite (Shaik, Alam, & Alandis, 2015). As observed in Figure 7, the DSC curves for the Cs, CsT4, Cs/OA and CsT4/OA nanocomposite films indicate that three peaks represent three stages of decomposition.…”

Nonedible Vegetable Oil-Based Polyols in Anticorrosive and Antimicrobial Polyurethane Coatings

“…TiO 2 NPs exhibited good antimicrobial activity and strongly bonded to electron donor groups in biological molecules containing oxygen, nitrogen, and sulfur, which destroyed the outermost layer of microorganisms [ 141 ]. TiO 2 incorporated CO-based PU nanocomposites and waterborne PU dispersions showed good antibacterial and antifungal activities against S. aureus, E. coli , B. pasteurii , Vibrio parahaemolyticus , and other fungal species [ 179 ].…”

Antimicrobial Polymers in the Nano-World

“…Eco-friendly polymeric biocides eliminate any or both of these issues. For example, biodegradable polymers as PLA and PCL, [ 256 ] or some natural polymers such as polysaccharides [ 257 , 258 ] can be used instead of the non-biodegradable polymer matrices as well as natural biocides as some natural oils can be incorporated as active agents [ 259 ]. Mallakpour et al [ 260 ] described a polymeric film based on a poly(amino acid) derived from N , N ’-(pyromellitoyl)- bis - l -tyrosine dimethyl ester that was biodegradable and biologically active at the same time.…”