Document Type

Article

Publication Date

4-17-2024

Abstract

Polyurethanes are large molecules formed by combining substances with hydroxyl groups with Poly isocyanates through polyaddition reaction for many applications like foams, adhesives, coating etc. Rigid polyurethane foams (RPUFs) are created for soundproofing and thermal insulation material. In this study, RPUFs have been modified by using nitrogen-phosphorus-containing flame-retardant, an ionic liquid (IL), and expandable graphite. To confirm the successful synthesis fourier transform infrared (FT-IR) spectra and nuclear magnetic resonance (NMR) spectroscopy have been performed. RPUFs were mixed with IL-EG and DPES to see how it changes the structure of the pore and improves the density and strength of the foam's how it breaks down at high temperatures (thermal decomposition). The tests showed that IL-EG/DPES was better in thermal stability at high temperatures and had a great ability to grow and burn. When IL-EG and DPES were mixed in a 1:1 mixture, the flame-retardant RPUF had the most flame retardancy, the best flame-retardant performance, and the highest compressive strength also when increased the ratio of IL-EG/DPES shows the heat release rate (HRR), and smoke release rate (SRR) decreased significantly. The time to ignition (TTI) shows an increasing trend with high wt.% of flame-retardant. This happened because the IL-EG and DPES formed hydrogen bonds with each other, and the new flame-resistant coating on the RPUF surface stopped gas or heat from getting into the PU matrix.

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