Synthesis of Vegetable Oil‐Based Polyurethane: A Study on Curing Kinetics Behavior |
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| Authors: | Swarnalata Sahoo Hemjyoti Kalita Smita Mohanty Sanjay K. Nayak |
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| Affiliation: | 1. Laboratory for Advanced Research in Polymeric Materials, LARPM, CIPET, Bhubaneswar 751 024, India;2. Central Institute of Plastic Engineering and Technology (CIPET), Chennai 600 032, India |
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| Abstract: | In the present study, biobased polyurethane (BPU) samples were synthesized from three different polyols along with polymeric hexamethylene diisocyanate. The three different polyols were synthesized by reacting castor oil with ethylene glycol, triethylene glycol, and triethanolamine. The synthesized polyols were confirmed using proton nuclear magnetic resonance (1H NMR) spectra analysis. BPU samples were confirmed by the disappearance of isocyanate peak in the FTIR spectra. The cross‐linking densities of all BPU samples were determined using swelling studies. Curing kinetics behavior of all BPU samples were analyzed using differential scanning calorimetry at three different heating rates (5, 7.5, and 10°C/min). The curing kinetic parameters were studied using three nonisothermal methods such as Kissinger, Flynn–Wall–Ozawa, and Ozawa, respectively. The activation energies were found to increase with increasing degree of cure (α). Surface properties of all the synthesized BPU samples were evaluated by dynamic mechanical analysis and scanning electron microscopy. |
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