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, and 13C‐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.
Highlights
Vegetable oils have recently gained a lot of interests owing to the fact that they are renewable resources and possess high environmental benefits
HECA was obtained by the reaction of diethanolamine with castor oil
HECA was reacted with terephthalic acid to form Castor oil based polyesteramide (CPEA) and further treated with TDI with addition of TiO2 nanoparticles to obtain UCPEA nanocomposite
Summary
Vegetable oils have recently gained a lot of interests owing to the fact that they are renewable resources and possess high environmental benefits Vegetable oils such as castor oil, linseed oil, soybean oil, rapeseed, olive, cottonseed, Jatropha, Pongamia glabra, rubber seed, and Jojoba oil are used in chemical industries for the manufacturing of coatings, surfactants, soaps cosmetic products, lubricants, and paints [1,2,3]. Vegetable oils based biopolymers such as alkyd [9], polyurethane [10], epoxy [11], polyesteramide [12], and polyetheramide [5, 13] are used in the area of paint and coatings These polymers are biodegradable, less volatile content, environmental friendly, nontoxic, and inexpensive materials. The incorporation of ester and urethane moieties in polymer chain improved its physicomechanical and chemical resistance properties
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