In recent years, environmentally friendly substituted raw materialsfor preparing polymers have become needs with the development of materialscience. Many specific investigations were focused on polymer materials basedon renewable resources. The main achievement is devoted to the preparation of polyolfrom plant sources due to its wide availability, economical and eco-friendlycharacteristics. Several bio-based materials, including cellulose, starch,natural oil, and sugar, have been utilized as starting material forpolyurethanes. Vegetable oils are among the most promising, because ofthey are an inexpensive, readily available and renewable resource. The six common fatty acids are palmitic (C 16 :0), stearic (C 18 : 0), oleic (C 18 : 1), linoleic (C 18 : 2), linolienic (C 18: 3), and recinoliec (C 18 : 1 OH )acids( in this notation, the first number represents the number of carbon atoms, thesecond number represents the number of C-C double bonds, and OH representshydroxyl groups in fatty acid). The reactive sites are ester bonds, C=C,and hydroxyl group which exist in some oils. All the vegetable oils have beenextensively studied for the production of polyols and polyurethanes.
In this paper, we report on thedevelopment of polyols by the oxirane ring opening technique. The oxirane ring opening is animportant class of organic equilibrium exchange reaction in which one epoxyring opened by another fatty acid moiety. In the epoxidation of vegetable oils, the triglyceride reacts withmethanoic acid followed by addition of peroxide and this process is oftencalled epoxidation.
Hence, they are several aspects included such as, the typeof polyol preparation, the carboxyl to epoxy mole ratio and temperaturehave influence on the progress of the reaction. The recinoleic fatty acid isobtained directly via saponification of castor oil, that is bytreatment of the oil with alkali in the presence of HCl as a neutralizingagent. The preparation method follows, variety of vegetable oils are preparedto polyols, such as, castor oil fatty acid(CaOFA) was used to ring- opening to epoxy groups in epoxidised sesameoil (ENO), epoxidised peanut oil (EJO). The presentcommunication deals with the effect of ring-opening duration newly synthesized polyurethane (PUs) such as TNCP and TJCPderived from NCOL and JCOL, their structures and functionalities werecharacterized by the FT- IR,1H NMR, 13C NMR and theviscosity of the polyols were characterized by Rheometry. The present communication deals with synthetic and thermaldegradation properties of a newly synthesized polyurethane (PUs) such as TNCPand TJCP derived from NCOL and JCOL. TheFreeman-Carroll’s methods have been applied for the calculation of kineticparameters from thermogravimetry (TGA) curve.
They has been discussed thermaldegradation curve in order to determine their mode of decomposition, order ofreaction, apparent activation energy, free energy change, entropy change.