Specific crosslinking effects of poly(epichlorohydrin)-triol on urethane polymer matrix of castor seed oil-based coating
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Specific crosslinking effects of poly(epichlorohydrin)-triol on urethane polymer matrix of castor seed oil-based coatings T. O. Siyanbola, R. Enishetty, R. Kumar, O. O. James, G. I. Olasehinde, S. Kaki, R. Narayan, K. V. S. N. Raju
American Coatings Association 2020 Abstract The contributions of castor seed oil (CSO) as a useful, nontoxic, and sustainable base material for coating systems cannot be overemphasized. This paper took advantage of the predominant fatty acid composition in CSO (i.e., ricinoleic acid). It blended a synthesized crosslinker, poly(epichlorohydrin-triol) (PECH-triol), in percentages within its polymeric matrix. Physicochemical and spectroscopic (FTIR, 1 H-NMR, and 13C-NMR) examinations were carried out on the polyols. Thermal stability, hydrophobicity,
R. Narayan and K. V. S. N. Raju are host supervisors at Indian Institute of Chemical Technology, Hyderabad, Telangana, India. T. O. Siyanbola (&), R. Enishetty, R. Kumar, R. Narayan, K. V. S. N. Raju Polymers and Functional Materials Division, Indian Institute of Chemical Technology, Hyderabad 500 007, India e-mail: [email protected] T. O. Siyanbola Department of Chemistry, Covenant University, P.M.B. 1023, Ota, Ogun State, Nigeria R. Kumar, S. Kaki, R. Narayan, K. V. S. N. Raju Academy of Scientific and Innovative Research (AcSIR), Rafi Marg, New Delhi 110001, India O. O. James Chemistry Department, Kwara State University, P.M.B. 1530, Malete, Kwara State, Nigeria G. I. Olasehinde Department of Biological Sciences, Covenant University, P.M.B. 1023, Ota, Ogun State, Nigeria S. Kaki Centre for Lipid Science and Technology, Indian Institute of Chemical Technology, Hyderabad 500 007, India
anticorrosion, mechanical, and antibacterial properties of the prepared polyurethane (PU) coatings were examined. The 20% PECH-triol–CSO-PU film having its TON and TEND at 230.5 and 511.0C, respectively, showed improved thermal stability when compared with the pristine film (CSO-PU). The derivative of TGA reveals a three-stage degradation step. Hydrophobicity was seen to increase from 73.3 to 92.2, a reflection of the crosslinking effect of PECHtriol within the urethane matrix. The improved adhesion of 20% PECH-triol–CSO-PU coating on mild steel gave a better chemical resistance.
J. Coat. Technol. Res.
Graphic abstract
Keywords Poly(epichlorohydrin), Seed oil, Crosslinker, Thermal stability, Antibacterial
Introduction Research in the past few decades has shown a tremendous drift toward the use of sustainable resource materials like proteins, natural rubber, polysaccharides (primarily starch and cellulose), sugar, and vegetable seed oils (VSOs) as a viable industrial feedstock for the production of valuable goods and services.1,2 This drift is born out of the fact that petroleum, which is the base natural resource for petrochemicals, is quickly depleting in reserves worldwide; also, the global crisis centering on this resource material (petroleum) has created severe environmental challenges such as crude oil spillage, gas flari
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