Abstract
The present study attempts the synthesis of a cyclic multifunctional flame-retardant (FR) moiety from o-phenylenediamine (OPDA) as the starting material. OPDA was reacted with phenylphosphonic dichloride and further with the 3-monochloro-1,2-propanediol to obtain the final product (FRPOL) which was then incorporated into epoxy and polyurethane coating systems. The structure of the synthesized molecule was confirmed using hydroxyl value, Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. The cured coating films were characterized for thermal, mechanical and flame-retardant properties. Thermogravimetric analysis and differential scanning calorimetry were used to carry out the thermal degradation studies and to know the glass transition temperatures (Tg), respectively. The thermal and mechanical properties were excellent after the incorporation of the synthesized molecule into the coating systems. The limiting oxygen index (LOI) and UL-94 vertical burning tests were carried out to check the flame retardancy of the cured coating films. The polyurethane with FR had the maximum LOI value of 32 while the epoxy with 45% concentration of FR had a maximum LOI value of 26 among all the coating formulations. The formulations with FRPOL displayed self-extinguishing behavior with no dripping in UL-94 test.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
