Novel phosphorus-containing epoxy resin from renewable resource
The synthesised epoxy resin was characterised by physicochemical and spectral analysis including Fourier-transform infrared (FTIR), 1H and 31P nuclear magnetic resonance spectroscopies. Curing of the epoxy resin mixture was carried out with polyamide hardener at 1:1 stoichiometry on equivalent weight basis. The developed coatings were characterised in terms of their mechanical, solvent, gel content, water absorption, chemical, thermal, and flame-retardant properties, while the glass-transition temperature and thermal stability of the coatings were analysed by differential scanning calorimetry and thermogravimetric analysis, respectively.
SA-based epoxy resin improves coating properties
The results revealed that the coatings with added SA-based epoxy resin showed good mechanical, chemical, and solvent-resistance properties. The thermal profile of the coatings manifested that the char yield increased with the concentration of the SA-based epoxy resin. Limiting oxygen index (LOI) and UL-94 tests were performed to understand the flame-retardancy behaviour of the synthesised coatings, revealing an enhancement as the concentration of phosphorus-containing epoxy resin was increased.
The study is published in: Journal of Coatings Technology and Research March 2019, Volume 16, Issue 2, pp 531–542.
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