Studies on Boron Containing Poly(urethane fattyamide)

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

This review describes the preparation of nonedible vegetable oil (NEVO)-based polyols and their application in anticorrosive and antimicrobial polyurethane (PU) coatings. PUs are a class of versatile polymers made up of polyols and isocyanates. Renewable vegetable oils are promising resources for the development of ecofriendly polyols and the corresponding PUs. Researchers are interested in NEVOs because they provide an alternative to critical global food issues. The cultivation of plant resources for NEVOs can also be popularized globally by utilizing marginal land or wastelands. Polyols can be prepared from NEVOs following different conversion routes, including esterification, etherification, amidation, ozonolysis, hydrogenation, hydroformylation, thio-ene, acrylation, and epoxidation. These polyols can be incorporated into the PU network for coating applications. Metal surface corrosion and microbial growth are severe problems that cause enormous economic losses annually. These problems can be overcome by NEVO-based PU coatings, incorporating functional ingredients such as corrosion inhibitors and antimicrobial agents. The preferred coatings have great potential in high performance, smart, and functional applications, including in biomedical fields, to cope with emerging threats such as COVID-19.

Thermal and Kinetic Behaviour of Pongamia Glabra Oil Fatty Amide

N,N-bis(2-hydroxyl ethyl) Pongamia glabra oil fatty amide (HEPA) was synthesised by the aminolysis of pongamia oil. The structural elucidation of HEPA was carried out by FTIR, 1H NMR and 13C NMR spectroscopy. Physico-chemical studies were carried out by standard laboratory methods. Melting point of pongamia glabra oil and HEPA was measured through differential scanning calorimetry. Thermogravimetry/differential thermogravimetry analysis (TG/DTGA) was used to evaluate the thermal and kinetic behaviour of synthesised HEPA in nitrogen atmosphere under nonisothermal conditions with heating rates of 5, 10, 20, and 30 °C min−1. The TG curves of polymers at four heating rates were approximately in the same shape which indicated that mass loss is independent of heating rate. Obtained TGA data were analysed by the means of model-free isoconversional methods using Flynn–Wall–Ozawa and Kissinger–Akahira–Sunoseon applications on the whole range of temperature, and were found to be consistent. It was found that at the end of the decomposition process, the value of activation energy increases.

Microwave-assisted preparation of urethane-modified polyetheramide coatings from Jatropha seed oil

We have developed urethane-modified polyetheramide (UPEtA) by the condensation polymerization reaction of N,N-bis (2-hydroxy ethyl) Jatropha oil fatty amide and hydroquinone to form polyetheramide (PEtA). Jatropha PEtA was further treated with toluylene-2,6-diisocyanate (TDI) in different weight percentage (15, 20, 25 wt%) to produce UPEtA. The structural elucidation of PEtA and UPEtA was carried out by Fourier transform infrared, proton nuclear magnetic resonance and carbon-13 nuclear magnetic resonance spectroscopic techniques. The coatings of UPEtA were prepared on mild steel strips to investigate their physico-mechanical and corrosion resistance performance. Physico-chemical and physico-mechanical tests were performed by standard methods. Corrosion resistance tests were examined in different corrosive media, such as 3.5 wt% HCl, 3.5 wt% NaOH, 5.0 wt% NaCl, water and xylene. The thermal behavior of UPEtA was studied by thermogravimetric analyses. Our studies revealed that UPEtA may find application as an eco-friendly corrosion protective coating and may be safely used up to 200oC.