High thermal stability of aliphatic polyurethanes prepared from sesame and peanut oil and their kinetic parameters

Abstract

Thermo-responsive vegetable oil-based polyurethanes were successfully prepared by poly-condensation reaction in the mixture of polyol and hexamethylene diisocynate. The functionality and high molecular weight of the polyurethanes were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Proton Nuclear Magnetic Resonance Spectroscopy (1H NMR), Carbon Nuclear Resonance Spectroscopy (13C NMR), and Gel Permeation Chromatography. The viscosity of the polyols was characterized by Rheometry and flow rate of the polyols were derived from power law model. The kinetic and thermodynamic parameters of synthesized polyurethanes HSCP and HPCP were calculated from by TG curve. Five different mass loss temperature was obtained in the TGA curve of HSCP and HPCP, which corresponded to the decomposition of the physically observed NH and C=O formed between polyol and diisocyanate, respectively. The average value of the activation energy calculated by Murray and White, Coats and Redfern, Doyle’s, and Freeman-Carroll’s method. The success of the investigated different vegetable oil-based polyurethanes, in comparison with the activation energy of the Freeman-Carroll’s method to determine the thermal stability and the lifetime prediction of the peanut and sesame oil-based polyurethanes is 1.87×105 and 1.27×104 s-1.

Synthesis and Characterization of Biodegradable Jatropha Oil Based Polyurethanes Using Modified Sesame Oil as Cross-Linker Containing Different NCO Groups with Improved Thermal Stability

“…According to the isocyanate linkages in polyurethane, PU-1 has lower retention as compared to PU-2 and PU-3, which is due to the segmental motion of polyurethane which increased their molecular rigidity and extended the solid-state property [4,6,13,27]. These results identified all the aromatic linked polyurethanes (PU-2 & PU-3) having higher stability in nature as compared to PU-1 [22][23][24][25][26][28][29][30][31].…”

Theoretical DFT study of Cannizzaro reaction mechanism: A mini perspective

“…Kinetics is an important aspect of any reaction; especially for organic reactions [11][12][13][14][15]. The kinetics give us important data about the reaction.…”