Newly Developed Epoxy-Polyol and Epoxy-Polyurethane From Renewable Resources
C. O. Akintayo, E. T. Akintayo, Ziegler Thomas, B. M. Babalola
Current Journal of Applied Science and Technology · pp. 984–993 · Published 12 Jul 2013
10.9734/BJAST/2013/3985Abstract
Bio-polyols are important component in polyurethane industries. The preliminary studies into the synthesis of bio-polyol products (epoxy-polyol and epoxyl-polyurethanes) from Jatropha curcas were investigated. The reactions were followed by both Infrared and nuclear magnetic resonance. Infrared analysis was performed on a Nicolet 380 Fourier-transform infrared (FTIR) spectrophotometer using NaCl cells. 1H-nuclear magnetic resonance (NMR) and 13C-NMR were obtained on a BrukerAvance 400 NMR spectrophotometer. Approximately 100mg sample was dissolved in 1 ml of deuterated chloroform. Physico-chemical characterisation of the samples for iodine value (IV), acid value (AV), saponification value (SV) and hydroxyl value (HV) were carried out by dissolving 0.25g of sample in appropriate medium and the various values determined titrimetrically. Thermal transitions of the products were studied by heating 5mg of the sample from 20ºC to 80ºC and then cooled to -50ºC on a differential scanning calorimeter (DSC). The preparation of epoxylpolyol and polyurethane from Jatropha curcas oil was smooth and efficient. Results of film and solubility properties revealed that coatings of Jatropha curcas epoxy-polyurethanes performed better with increased loading of Toluylene 2, 4-diisocyanate (TDI) up to 2wt% while their solvent resistance decreased beyond a TDI loading of 1.2wt%. DSC analysis shows the epoxy-polyurethane to be less stable compared to the epoxy-polyol.
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