Isosorbide-derived boron- and phosphorus-containing precursors for flame-retardant epoxy coating

  • Parth Sheth
  • Siddhesh Mestry
  • Dwij Dave
  • Shashank MhaskeEmail author


The present study describes an attempt to induce the inherent flame retardancy to the epoxy resin by incorporation of phosphorous and boron atoms in the polymer backbone through the curing agents. Phosphorous (PPc)- and boron (BPc)-containing precursors were synthesized and incorporated into the commercial epoxy and hardener system with different molar ratios. The structures of the synthesized compounds were confirmed using hydroxyl value, Fourier transform infrared spectroscopy, and nuclear magnetic resonance spectroscopy. The thermal, physical, and mechanical properties of the cured films were performed using different testing methods. Thermogravimetric analysis and differential scanning calorimetry results showed the overall increased thermal stability and char yield along with the glass transition temperatures (Tg) due to the incorporation of newly synthesized phosphorus- and boron-containing compounds in the coating films. The mechanical properties and solvent resistance of the cured films were excellent. The flame-retardant properties of the cured films were increased with the incorporation of PPc and BPc. The highest limiting oxygen index was obtained for the formulation with equal amounts of PPc and BPc as 29 while UL-94 showed the self-extinguishing behavior within 10 s after ignition.


Flame retardancy Isosorbide Epoxy Phosphorous oxychloride Boric acid 


Supplementary material

11998_2019_262_MOESM1_ESM.docx (183 kb)
Supplementary material 1 (DOCX 183 kb)


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Copyright information

© American Coatings Association 2019

Authors and Affiliations

  • Parth Sheth
    • 1
  • Siddhesh Mestry
    • 1
  • Dwij Dave
    • 1
  • Shashank Mhaske
    • 1
    Email author
  1. 1.Department of Polymer and Surface EngineeringInstitute of Chemical TechnologyMumbaiIndia

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