Development of Poly (Ester Amide-Urethanes) from De-saturated Thevetia peruviana Seed Oil-FAMEs

Abstract

Authors carried out the scientific investigations of this work. Author TOS designed the study and prepared the first draft. Author SK managed data evaluation. Author RN assessed data reports. Authors BA and BVSKR respectively prepared FAMEs and ran GC-FID. Authors OO and ETA managed literature searches and editing of script. Author KVSNR supervised the entire bench work. All authors read and approved the final script.

Studies on the Antibacterial and Anticorrosive Properties of Synthesized Hybrid Polyurethane Composites From Castor Seed Oil

“…This is expected to drop geometrically in PURFA, as these hydroxyls are used up for urthanation. This observation is in agreement with Zafar et al 11 and Siyanbola et al 12 The observed decrease in saponification and iodine values from RCSO to HERCA and later RCPEA and PURFA confirms cross linking inclinations within the polymer matrix hence, increase in molar mass of the resulting polymer product. The solubility test of resins (HERCA, RCPEA, and PURFA) was performed by taking 0.1-0.2 g of sample in 10 ml of solvent and stirring well for up to 15 min and heating if necessary 1 RCPEA showed excellent solubility (greater than 95%) in all the tested solvent, however, PURFA showed less than 80% in methanol and ethanol.…”

“…This is as a result of chain entanglement in within coating system (especially, as the percentage composition of the modified nanomaterial increases within the polymer matrix) hence, unreacted free isocyanate groups chemically react with moisture in the environment. 5,12,13 The seven days drying time for PURFA is high when compared with five days observed with Siyanbola et al 5 This may be due to the nature of diisocyanate (4,4'-diisocyanatodicyclohexylmethane) used in 5 . However, this resin stayed a longer time in the water and its films were not affected.…”

Spectroscopic Examinations, Antimicrobial and Anti-corrosive Evaluations of Polyurethanes Synthesized from Thevetia Peruviana Seed Oil

“…Three replicates were maintained for each treatment. MTCC is the Microbial Type Culture Collection in IMTECH (CSIR LAB) Chandigarh, India 10,14 . Different grades of Silicon carbide papers were used for the preparation of mild steel strips; which were washed with water, ethanol and acetone.…”

“…The urethane films on the panels became dried to touch in about 50 minutes after they were casted but became tack free in 7 hours. These developments is as a result of chain entanglement in the coating systems and afterwards produce an environment whereby free unreacted isocyanate groups chemically react with moisture forming urea linkages or the already formed urethane group, thereby leading to the formation of allophanate 14,17 . Figure 6 shows the photographic representation of coated panels before and after 380 hours of salt spray.…”