Synthesis and Characterization of Polyurea Resin for Dielectric Coating Applications |
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Authors: | Priya Rakshit Ramesh Jain Shailesh Shah |
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Affiliation: | 1. Material Research Cell, Electrical Research and Development Association, Makarpura, Vadodara, India;2. Department of Chemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, India |
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Abstract: | In this article, polyurea coatings were synthesized by reaction between toluene diisocyanate, and polyether difunctional and trifunctional amines PO-1 and PO-2 by incorporating urea linkage. The isocyanate-terminated prepolymers formed were further reacted with short-chain amines as chain extender as well as curing agents. These resins were synthesized by varying the molar ratio of amines and isocyanate and keeping the molar ratio of other monomers constant. The presence of functional groups were determined using Fourier transform infrared spectroscopy. The thermal stability of polymers was determined using the thermogravimetric analysis and differential scanning calorimetry. The polymers were further tested for mechanical and electrical properties. It was observed that on increasing the hard segments in the polymer the electrical properties increase whereas elongation decrease. As isocyanate content increases, crosslinking increases resulting in improvement in dielectric properties. The maximum dielectric strength observed was 45 kV mm?1 and dissipation factor was 0.068. |
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Keywords: | Coatings dielectric properties differential scanning calorimetry mechanical properties resins |
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