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Rigid polyurethane foams (RPUFs) were prepared by heteroaromatic polyol as the matrix polyol, methylphosphonate (DMMP) was added to improve its flame retardancy, and the relative performances were studied. Thermal stability were measured by dynamic mechanical analysis (DMA) and thermo gravimetric analysis (TG), limiting oxygen index (LOI) was selected to investigate the flame retardancy. Results showed that the glass transition temperature (Tg) of RPUF prepared by heteroaromatic polyol was 180oC and the initial decomposition temperature was reached to 200oC, much higher than that of RPUFs prepared by ordinary polyether and polyester polyol, demonstrated that the special heteroaromatic polyol exhibited a better thermal stability. In addition, the characterization of flame-retardant RPUFs displayed that the LOI value increased significantly with the increasing amount of flame retardant and reached to 31.5% in the experimental range, which illustrated that the flame retardancy was improved apparently. Better char-forming ability was observed from TG test. The char residue was up to 34% at 800 oC when the flame retardant additive was 20%. Scanning electron microscope (SEM) image proved that a compact char-layer covered on the surface of the material after burning. The compressive strength was 0.14MPa when the addition amount was 25%, which indicated that the addition of DMMP has little effect on the compressive strength of RPUF with heteroaromatic polyol.

Research on the Properties of Rigid Polyurethane Foam with Heteroaromatic Polyol